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学者姓名:张建勋

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A novel martensitic steel powder for plasma arc direct energy deposition to remanufacture broken gear teeth EI SCIE
期刊论文 | 2021 , 301 | Materials Letters
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Abstract :

A novel martensitic steel powder was employed to remanufacture broken teeth on open gears by plasma arc direct energy deposition technique. To fabricate tapered rectangles resembling broken gear teeth, a process was developed and both cross sections and longitudinal sections were optimized. The hardness of the remanufactured tooth was 2.92 times that of the AISI 1045 gear, and the wear loss was decreased by 35.9%. The microstructure of the intragranular martensitic structure, the intergranular eutectic (Fe, Cr)23C6 particles and the M2B hard phase were the main reasons for the high hardness and wear resistance. The hardness of the remanufactured tooth presented a uniform distribution in general, which was due to the microstructure of the novel 1Cr17Ni2B deposition material. © 2021

Keyword :

Hardness Chromium alloys Martensitic stainless steel Deposition 3D printers Wear of materials Wear resistance Gear teeth Powder metals Textures

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GB/T 7714 Liu, Yan , Zhang, Jianxun , You, Qishen et al. A novel martensitic steel powder for plasma arc direct energy deposition to remanufacture broken gear teeth [J]. | Materials Letters , 2021 , 301 .
MLA Liu, Yan et al. "A novel martensitic steel powder for plasma arc direct energy deposition to remanufacture broken gear teeth" . | Materials Letters 301 (2021) .
APA Liu, Yan , Zhang, Jianxun , You, Qishen , Zhang, Linjie . A novel martensitic steel powder for plasma arc direct energy deposition to remanufacture broken gear teeth . | Materials Letters , 2021 , 301 .
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Research on Impact Toughness in Microzones of 12Cr/30Cr2Ni4MoV Dissimilar Rotor Steel Welded Joint EI
期刊论文 | 2021 , 57 (2) , 53-61 | Journal of Mechanical Engineering
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Abstract :

The dissimilar rotor steel welded joint (12Cr/30Cr2Ni4MoV) with buttering layer is fabricated by using the combined welding technology of narrow-gap tungsten inert gas (NG-TIG) and narrow-gap submerged arc welding (NG-SAW). The shear strength of joint microzone is obtained by microshear test, and the ductile-brittle transition temperature FATT50 of microzones is obtained by partition test. The influence of microstructure on hardness, strength and toughness of microzones is investigated. The results indicate that the distribution characteristics of hardness and shear strength in welded joint are basically the same. The mechanical properties of HAZs exhibit gradient distribution, and interface mechanical properties mismatch on both sides of the fusion line. There is a local weakening area in buttering layer, and the micro-hardness value is 227 HV, which is the weakest area of the whole welded joint. From base metal 12Cr to 30Cr2Ni4MoV, the ductile-brittle transition temperature FATT50 of joint microzones gradually decreases. At 20, the impact toughness of 30Cr2Ni4MoV and its heat affected zone is excellent, with generation of cracks at the interface between matrix and second phase, ductile fracture occurs through the aggregation of micropores. Quasi-cleavage fracture occurs in all the other microrzones, and the impact toughness of welded metal is the weakest. © 2021 Journal of Mechanical Engineering.

Keyword :

Molybdenum steel Ductile fracture Gas welding Inert gases Microhardness Heat affected zone Chromium alloys Welded steel structures Nickel steel Fracture toughness Chromium steel Temperature Submerged arc welding Vanadium steel

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GB/T 7714 Zhu, Bo , Wang, Wenke , Guo, Yang et al. Research on Impact Toughness in Microzones of 12Cr/30Cr2Ni4MoV Dissimilar Rotor Steel Welded Joint [J]. | Journal of Mechanical Engineering , 2021 , 57 (2) : 53-61 .
MLA Zhu, Bo et al. "Research on Impact Toughness in Microzones of 12Cr/30Cr2Ni4MoV Dissimilar Rotor Steel Welded Joint" . | Journal of Mechanical Engineering 57 . 2 (2021) : 53-61 .
APA Zhu, Bo , Wang, Wenke , Guo, Yang , Xiong, Jiankun , Zhang, Jianxun . Research on Impact Toughness in Microzones of 12Cr/30Cr2Ni4MoV Dissimilar Rotor Steel Welded Joint . | Journal of Mechanical Engineering , 2021 , 57 (2) , 53-61 .
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Study on low-cycle fatigue property of 12Cr/30Cr2Ni4MoV heterogeneous joint EI
期刊论文 | 2021 , 42 (2) , 16-23 | Transactions of the China Welding Institution
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In this article, the microstructure, micro-hardness and low-cycle fatigue property of a 12Cr/30Cr2Ni4MoV welded joint have been studied. The results show that the microstructure of the 12Cr is lath tempered martensite, 30Cr2Ni4MoV is lath tempered martensite and granular tempered bainite. The microstructure of the buttering layer (BL) and weld metal (WM) is granular tempered bainite. WM is composed of columnar grain regions and equiaxed grain regions alternately. 30Cr2Ni4MoV has higher micro-hardness than 12Cr, and the BL is the lowest. Micro-hardness in the heat-affected zone (HAZ) is gradient change. 12Cr, 30Cr2Ni4MoV and BL show cyclic softening characteristics, while WM has initial cycle hardening and subsequent cyclic softening characteristics. BL has the highest fatigue transition life; the 12Cr/BL interface is the weakest link of the low-cycle fatigue of the entire heterogeneous welded joint. The second phase particles distributed in the grain boundary or sub-grain boundary of the columnar grains have uncoordinated deformation with the matrix of WM, which result in the initiation of fatigue cracks in second phase Copyright © 2021 Transactions of the China Welding Institution. All rights reserved.

Keyword :

Fatigue of materials Heat affected zone Chromium alloys Bainite Welding Textures Microhardness Grain boundaries Martensite

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GB/T 7714 Xiong, Jiankun , Shang, Chunqiang , Wu, Haifeng et al. Study on low-cycle fatigue property of 12Cr/30Cr2Ni4MoV heterogeneous joint [J]. | Transactions of the China Welding Institution , 2021 , 42 (2) : 16-23 .
MLA Xiong, Jiankun et al. "Study on low-cycle fatigue property of 12Cr/30Cr2Ni4MoV heterogeneous joint" . | Transactions of the China Welding Institution 42 . 2 (2021) : 16-23 .
APA Xiong, Jiankun , Shang, Chunqiang , Wu, Haifeng , Wang, Wenke , Cao, Tainlan , Zhang, Jianxun . Study on low-cycle fatigue property of 12Cr/30Cr2Ni4MoV heterogeneous joint . | Transactions of the China Welding Institution , 2021 , 42 (2) , 16-23 .
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Low-Cycle Fatigue Properties of Ti6Al4V Laser-Welded Joints Based on a Local Strain Approach EI SCIE
期刊论文 | 2021 , 30 (4) , 2772-2780 | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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Abstract :

The low-cycle fatigue (LCF) properties of Ti6Al4V and laser-welded joints with different welding speeds are studied using smooth and notched flat specimens. A local strain approach is proposed to estimate the LCF properties of the notched flat specimen based on elastic-plastic finite element analysis (EPFEA). The local strain used in the approach is defined as the average strain in the plastic zone at the notch root and critical section of the notched flat specimen. The results indicate that the local strain approach is suitable for estimating the LCF properties of the notched flat Ti6Al4V titanium alloy specimen. The stress-strain relationship derived from the microhardness can be used in the EPFEA. The LCF properties of the Ti6Al4V laser-welded joints are worse in the heat-affected zone (HAZ) than in the base metal (BM) due to the martensite structure in the HAZ and the mechanical heterogeneity in the welded joints. The LCF properties of the Ti6Al4V laser-welded joints with different welding speeds are close under low strain levels and worse with higher welding speeds under high strain levels.

Keyword :

LCF EPFEA laser welding local strain approach Ti6Al4V titanium alloy

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GB/T 7714 Xu, Zhenzhen , Zhang, Jianxun , Wang, Wenke et al. Low-Cycle Fatigue Properties of Ti6Al4V Laser-Welded Joints Based on a Local Strain Approach [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 , 30 (4) : 2772-2780 .
MLA Xu, Zhenzhen et al. "Low-Cycle Fatigue Properties of Ti6Al4V Laser-Welded Joints Based on a Local Strain Approach" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 30 . 4 (2021) : 2772-2780 .
APA Xu, Zhenzhen , Zhang, Jianxun , Wang, Wenke , Sun, Pinpin . Low-Cycle Fatigue Properties of Ti6Al4V Laser-Welded Joints Based on a Local Strain Approach . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 , 30 (4) , 2772-2780 .
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Properties and formation mechanism of cladding layer on high-strength low-alloy steel subjected to ultrasonic impact treatment with titanium alloy pin EI SCIE
期刊论文 | 2021 , 418 | SURFACE & COATINGS TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

The EQ70 high-strength low-alloy steel plate was treated using ultrasonic impact treatment (UIT) with titanium alloy (Ti6Al4V) pins. Scanning electron microscopy with energy dispersive X-ray microanalysis and X-ray photoelectron spectroscopy were employed to study the structure, morphology, surface chemical state, and composition of the treated product on the surface of the EQ70 steel. The microhardness was measured on the surface and the cross-section of the specimens. And the electrochemical corrosion test in the 3.5 wt% NaCl medium was carried out to evaluate the corrosion resistance of the UIT-treated specimens with different impact intensities and that without UIT. It is found that the UIT with Ti6Al4V pins can result in a mixed oxide cladding layer on the surface of the steel plate, the thickness of which increased with the impact intensity (treatment time). The elements in the cladding layer mainly come from the impact pin (Ti, Al, V), base metal (Fe), and the atmosphere (0), and the contents of these elements do not change significantly with the impact intensity. TiO, TiO2, FeO and Fe2O3 are found to be the main oxides in the cladding layer. The mutual effect of the material transfer between the pin and the treated base metal is found. The surface hardness of the cladding layer increases with the impact intensity, reaching an almost constant value (approximately twice the hardness of the parent material) when the impact intensity is over 1.33 s/mm(2). The cladding layer can improve the corrosion-resistant properties of the EQ70 steel and get the best corrosion-resistant properties with an impact intensity ranging from 1.00 to 1.33 s/mm(2). The possible formation procedure of the cladding layer after UIT with titanium alloy pins is suggested. The chip from the pin (material transfer from the pin) and the mechanochemical oxidation is the main cause to form the cladding layer.

Keyword :

Cladding layer Titanium alloy impact pin Material transfer Oxidation Ultrasonic impact treatment

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GB/T 7714 Liu, Chuan , Wang, Jianfei , Tian, Lihui et al. Properties and formation mechanism of cladding layer on high-strength low-alloy steel subjected to ultrasonic impact treatment with titanium alloy pin [J]. | SURFACE & COATINGS TECHNOLOGY , 2021 , 418 .
MLA Liu, Chuan et al. "Properties and formation mechanism of cladding layer on high-strength low-alloy steel subjected to ultrasonic impact treatment with titanium alloy pin" . | SURFACE & COATINGS TECHNOLOGY 418 (2021) .
APA Liu, Chuan , Wang, Jianfei , Tian, Lihui , Liu, Zhenguang , Wang, Jianxin , Zhang, Jianxun . Properties and formation mechanism of cladding layer on high-strength low-alloy steel subjected to ultrasonic impact treatment with titanium alloy pin . | SURFACE & COATINGS TECHNOLOGY , 2021 , 418 .
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High cycle fatigue and fracture behaviors of CrMoV/NiCrMoV dissimilar rotor welded joint at 280 °C EI SCIE Scopus
期刊论文 | 2020 , 786 | Materials Science and Engineering A | IF: 5.234
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

High cycle fatigue (HCF) behaviors were systematically evaluated of a CrMoV/NiCrMoV dissimilar metal welded joint (DMWJ) with buttering layer in steam turbine rotor at 280 °C. Fatigue curves and parameters of the base metals (BMs), weld metal (WM), buttering layer (BL) and heat affected zones (HAZs) in the welded joint were obtained. Characteristic microstructures, carbides, and fatigue fracture were observed using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrum (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD). The results show that the fatigue properties of each region in the DMWJ are different. Fine-grained HAZs show a lower slop of fatigue curve than BMs. The fracture locations of HAZs occur at fusion boundaries, and this is related to the ferrite layer and carbon migration at the interface. The interface with ferrite layer is the weakest zone in whole DMWJ. After fatigue, dislocation density increases, and the dislocations are mainly entangled around the carbides, which enhances the fatigue properties of the welded joint. Coarse M7C3-type carbides in BL and WM are mainly concentrated on the subgrain boundary, and this causes fatigue crack propagation along the carbides. A fatigue fracture model associated with carbide is established to explain the cause and process of the fatigue crack propagation along carbides. © 2020 Elsevier B.V.

Keyword :

Cracks Fatigue crack propagation Ferrite Carbides Chromium compounds Fatigue of materials Welding High resolution transmission electron microscopy Fracture Scanning electron microscopy Heat affected zone

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GB/T 7714 Wang, Wen-Ke , Liu, Yan , Guo, Yang et al. High cycle fatigue and fracture behaviors of CrMoV/NiCrMoV dissimilar rotor welded joint at 280 °C [J]. | Materials Science and Engineering A , 2020 , 786 .
MLA Wang, Wen-Ke et al. "High cycle fatigue and fracture behaviors of CrMoV/NiCrMoV dissimilar rotor welded joint at 280 °C" . | Materials Science and Engineering A 786 (2020) .
APA Wang, Wen-Ke , Liu, Yan , Guo, Yang , Xu, Zhen-Zhen , Zhong, Jie , Zhang, Jian-Xun . High cycle fatigue and fracture behaviors of CrMoV/NiCrMoV dissimilar rotor welded joint at 280 °C . | Materials Science and Engineering A , 2020 , 786 .
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Study on Characteristics of Laser Welding-brazing of 6061 Aluminum Alloy to SPCC Cold Rolled Steel EI CSCD Scopus
期刊论文 | 2020 , 56 (6) , 41-49 | Journal of Mechanical Engineering
SCOPUS Cited Count: 4
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Abstract :

2 mm-thick 6061-T6 aluminum alloy and SPCC cold-rolled steel plate are used to obtain aluminum steel composite joints with both fusion and brazing characteristics by means of wire filling laser brazing method. The influences of pre-coated flux, groove bevel angle, bevel morphology and solder composition on the microstructure and mechanical properties of brazing joint are studied. The results show that pre-coating flux can greatly improve wettability of filler metal. The mechanical properties of laser brazing joint are better when 60° groove is prefabricated on the side of steel base metal than when 45° groove is prefabricated.. When the prefabricate groove angle of steel material is 60°, and the laser power, welding speed, wire feeding speed, laser defocusing amount, offset center of the laser spot center are 3.1 kW, 0.5 m/min, 2 m/min, -8 mm, +0.6 mm, respectively, with ER2319 Al-Cu filler metal, the average and maximum tensile strength of the joint are respectively 147 MPa and 159 MPa, the interface layer presents short whisker shape, the interface layer is 5-8 μm in thickness, the Cu element is dissolved in Al-Fe brittle phase by replacing Fe elements to reduce its brittleness. With ER5356 Al-Mg filler metal, the average tensile strength of the joint is 118 MPa when the laser power is 3 kW, the interface layer presents coarse saw tooth shape, and consists of FeAl2, Fe2Al5 and FeAl3 phase, the interface layer is 8-12 μm in thickness, the Mg element is gathered at the outside of brittle phase, and it has no obvious inhibitory effect on the growth of Al-Fe brittle phase; with ER4043 Al-Si filler metal, the average tensile strength of the joint is 129 MPa when the laser power is 3 kW, the interface layer presents small saw tooth shape, the interface layer is 3-4.5 μm in thickness, the Si element is dissolved in Al-Fe brittle phase to inhibit its growth. © 2020 Journal of Mechanical Engineering.

Keyword :

Metal cladding Binary alloys Filler metals Metals Brazing Cold rolled steel Aluminum alloys Fillers Welding Steel sheet Magnesium alloys Morphology Cold rolling Aluminum coated steel Tensile strength Fracture mechanics Silicon

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GB/T 7714 Zhang, Jianxun , Jiang, Xu , Xu, Zhenzhen et al. Study on Characteristics of Laser Welding-brazing of 6061 Aluminum Alloy to SPCC Cold Rolled Steel [J]. | Journal of Mechanical Engineering , 2020 , 56 (6) : 41-49 .
MLA Zhang, Jianxun et al. "Study on Characteristics of Laser Welding-brazing of 6061 Aluminum Alloy to SPCC Cold Rolled Steel" . | Journal of Mechanical Engineering 56 . 6 (2020) : 41-49 .
APA Zhang, Jianxun , Jiang, Xu , Xu, Zhenzhen , Zhang, Guifeng . Study on Characteristics of Laser Welding-brazing of 6061 Aluminum Alloy to SPCC Cold Rolled Steel . | Journal of Mechanical Engineering , 2020 , 56 (6) , 41-49 .
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High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor EI SCIE
期刊论文 | 2020 , 7 (1) | MATERIALS RESEARCH EXPRESS
WoS CC Cited Count: 1
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The high cycle fatigue (HCF) property and microstructure of a dissimilar metal welded joint (DMWJ) for ultra-supercritical steam turbine rotor were systematically investigated in this paper. The DMWJ was fabricated using narrow gap submerged arc welding (NG-SAW) technique with buttering layer. Conditional fatigue strength of 30Cr1Mo1V (BM-1), buttering layer (BL), weld metal (WM) and 30Cr2Ni4MoV (BM-2) based on S-N curve was obtained by HCF tests at room temperature. The microstructure and second-phase carbide as well as fracture appearance of BM-1, BL, WM and BM-2 were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that the BL has lower fatigue strength, which are related to more content of the soft ferrite and less content of the hard carbide. The acicular ferrite represents better fatigue properties than massive ferrite due to barrier effect. Additionally, dislocation density sharply increases near the carbides, grain boundaries, and lath structures resulting in dislocation tangle after HCF test, which helps to improve the fatigue strength of the welded joint. The carbide precipitated, aggregated, and grown in the grain boundaries promoted crack nucleation, reduced the crack propagation rate and affected the crack propagation path.

Keyword :

microstructure HCF ultra-supercritical steam turbine rotor carbide dissimilar metal welded joint

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GB/T 7714 Wang, Wen-Ke , Xu, Zhen-Zhen , Zhu, Bo et al. High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor [J]. | MATERIALS RESEARCH EXPRESS , 2020 , 7 (1) .
MLA Wang, Wen-Ke et al. "High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor" . | MATERIALS RESEARCH EXPRESS 7 . 1 (2020) .
APA Wang, Wen-Ke , Xu, Zhen-Zhen , Zhu, Bo , Zhang, Xiao-Fan , Zhong, Jie , Zhang, Jian-Xun . High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor . | MATERIALS RESEARCH EXPRESS , 2020 , 7 (1) .
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Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor EI SCIE Scopus
期刊论文 | 2020 , 785 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | IF: 5.234
WoS CC Cited Count: 4 SCOPUS Cited Count: 4
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Abstract :

Stratified tensile tests were performed to quantitatively investigate strain hardening behavior along a dissimilar metal welded joint (DMWJ) with buttering layer of ultra-supercritical turbine rotor. The results show weld region has lower tensile strength but better strain hardening capacity than base metals (BMs). The buttering layer (BL) exhibits higher strain hardening capacity than weld metal (WM). Two strain hardening exponents were found based on the fitted stress-strain curves using Hollomon equation. The lower exponent is related to the ferrite matrix, whereas the larger exponent is related to the precipitation phase, including martensite, bainite and sorbite. The gradient distribution of strain hardening exponent in heat affected zones (HAZs) is related to the gradient change of tempered martensite and grain size. The strain hardening mismatch in interface is related to the drastic changes in microstructure and amount of carbides. The dislocation cell structure and sub grain were observed after tensile tests, and carbides were elastic during tensile deformation. Kocks-Mecking (K-M) type plots of strain hardening rate versus true stress presented two hardening stages (stages III and IV) in welded joint. More ferrite and finer tempered martensite are conductive to extending the strain hardening period. Local strain hardening parameters play an important role in the accurate evaluation of crack behavior in HAZ and interface.

Keyword :

Hardening stage HAZ Strain hardening exponent Dissimilar metal welded joint Ultra-supercritical turbine rotor

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GB/T 7714 Wang, Wenke , Dong, Zhiqiang , Xu, Zhenzhen et al. Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2020 , 785 .
MLA Wang, Wenke et al. "Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 785 (2020) .
APA Wang, Wenke , Dong, Zhiqiang , Xu, Zhenzhen , Zhu, Bo , Zhang, Xiaofan , Zhong, Jie et al. Local strain hardening behavior in a dissimilar metal welded joint with buttering layer of ultra-supercritical turbine rotor . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2020 , 785 .
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Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment SCIE
期刊论文 | 2020 , 10 (3) | METALS
WoS CC Cited Count: 4
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The corrosion behavior of a 15Cr-6Ni-2Mo martensitic stainless steel (15Cr stainless steel) in a CO2/H2S environment was investigated by conducting high-temperature/high-pressure immersion tests combined with scanning electron microscopy and metallographic microscopy. The presence of H2S decreased the corrosion resistance of the 15Cr tubing steel. The critical H2S partial pressure (P-H2S) for stress corrosion cracking in the 15Cr tubing steel in the simulated oil field environment with a CO2 partial pressure of 4 MPa and an applied stress of 80% sigma (s) was identified. The 15Cr tubing steel mainly suffered uniform corrosion with no pitting and cracking when the P-H2S was below 0.5 MPa. When the P-H2S increased to 1 MPa and the test temperature was 150 degrees C, the pitting and cracking sensitivity increased. The stress corrosion cracking at a higher P-H2S is attributed to the sulfide-induced brittle fracture.

Keyword :

high-pressure tubing steel pitting corrosion stress corrosion cracking high-temperature

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GB/T 7714 Zhao, Xuehui , Huang, Wei , Li, Guoping et al. Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment [J]. | METALS , 2020 , 10 (3) .
MLA Zhao, Xuehui et al. "Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment" . | METALS 10 . 3 (2020) .
APA Zhao, Xuehui , Huang, Wei , Li, Guoping , Feng, Yaorong , Zhang, Jianxun . Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment . | METALS , 2020 , 10 (3) .
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