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Microstructure and local mechanical properties of a dissimilar metal welded joint with buttering layer in steam turbine rotor SCIE
期刊论文 | 2019 , 747 , 244-254 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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Abstract :

A novel dissimilar metal welded joint (DMWJ) is demonstrated in a steam turbine rotor application. The integrity of the joint is investigated using the stratified tensile method for the first time and its local tensile mechanical properties are evaluated. The effect of the amount of Cr and Mo, post weld heat treatment, welding heat flow and carbon migration on the microstructure and local mechanical properties of the DMWJ is analyzed by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro-hardness and stratified tensile tests. The results indicate that local mechanical properties in three heat affected zones (HAZs) exhibit gradient distributions with a significant mismatch in the boundary regions. The yield strengths of three HAZs varied from 557 to 873, 640 to 700 and 753 to 1035 MPa, and the corresponding ultimate tensile strengths were 690-899, 732-826 and 866-1088 MPa, respectively. The second-phase carbides in base metals and weld regions were mainly M3C, M23C6 and M7C3. The difference of mechanical properties in weld regions is related to shape of bainite. Drastic changes and mismatch of local mechanical properties in boundary regions are mainly attributed to the shape and quantity of martensite and bainite. Local mechanical properties without size-effect could be obtained by the stretched tensile method, which provides an accurate assessment of the integrity of DMWJs.

Keyword :

Local mechanical properties Steam turbine rotor Microstructure Integrity assessment Dissimilar metal welded joint Stratified tensile methods

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GB/T 7714 Wang, W. K. , Liu, Y. , Zhang, Q. B. et al. Microstructure and local mechanical properties of a dissimilar metal welded joint with buttering layer in steam turbine rotor [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2019 , 747 : 244-254 .
MLA Wang, W. K. et al. "Microstructure and local mechanical properties of a dissimilar metal welded joint with buttering layer in steam turbine rotor" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 747 (2019) : 244-254 .
APA Wang, W. K. , Liu, Y. , Zhang, Q. B. , Zhang, L. J. , Zhang, J. X. . Microstructure and local mechanical properties of a dissimilar metal welded joint with buttering layer in steam turbine rotor . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2019 , 747 , 244-254 .
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Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint SCIE Scopus
期刊论文 | 2018 , 8 (4) | METALS
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

There are two kinds of typical cross-section profiles for the fusion zone (FZ) of a laser welded thin section joint, i.e., a V-shaped cross-section and an H-shaped cross-section. Previous researches indicated that tensile strength of the V-shaped joint was lower than that of the H-shaped one due to the greater heterogeneity of strain distribution on the V-shaped joint during tensile process. In this work, impacts of the aspect ratio of FZ on the mechanical properties of laser welded thin section joints with an H-shaped cross-section profile were investigated. Welding conditions corresponding to two typical H-shaped joints (i.e., W-narrower with a narrower FZ, and W-wider with a wider FZ) were decided through a laser welding orthogonal experimental plan. Then, the microstructure and properties of both joints were examined and compared. The results show that the tensile strength of joint W-narrower and joint W-wider was about 72% and 80.9% that of the base metal, respectively. Both joints fractured in the FZ during tensile processes. The low-cycle fatigue life of the base metal, the joint W-narrower and the joint W wider were 3377.5 cycles, 2825 cycles and 3155.3 cycles, respectively. By using high-speed imaging, it was found that the fatigue crack of joint W-narrower initiated and propagated inside the fusion zone, while the fatigue crack of the joint W wider initiated at the edge of the base metal and propagated for a distance within the base metal before entering into the fusion zone. This work promoted our understanding about the influence of the weld bead shape on the properties of laser welded thin section joints.

Keyword :

fiber laser welding H-shaped fusion zone magnesium alloy thin sheet mechanical properties microstructure

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GB/T 7714 Lu, Guang-Feng , Zhang, Lin-Jie , Pei, Yi et al. Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint [J]. | METALS , 2018 , 8 (4) .
MLA Lu, Guang-Feng et al. "Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint" . | METALS 8 . 4 (2018) .
APA Lu, Guang-Feng , Zhang, Lin-Jie , Pei, Yi , Ning, Jie , Zhang, Jian-Xun . Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint . | METALS , 2018 , 8 (4) .
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Electrochemical Corrosion Behavior of 15Cr-6Ni-2Mo Stainless Steel with/without Stress under the coexistence of CO2 and H2S SCIE Scopus
期刊论文 | 2018 , 13 (7) , 6296-6309 | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
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Abstract :

An electrochemical study was performed on 15Cr-6Ni-2Mo stainless steel to evaluate its corrosion behavior. The specimens in the present study were divided into two groups: with and without applied stress. Three conditions were considered and showed significant influence on the corrosion behavior of 15Cr-6Ni-2Mo steel. When the conditions of coexisting CO2 and H2S were changed, the passivation state of the material surface had obvious differences. Applied stress decreased the corrosion potential and pitting potential and increased the pitting sensitivity of the materials. The influence of H2S on the corrosion resistance of materials under stress was more obvious.

Keyword :

Pitting potential Stainless Steel Corrosion Behavior Stress corrosion Polarization curves

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GB/T 7714 Zhao, Xue Hui , Feng, YaoRong , Tang, ShaWei et al. Electrochemical Corrosion Behavior of 15Cr-6Ni-2Mo Stainless Steel with/without Stress under the coexistence of CO2 and H2S [J]. | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE , 2018 , 13 (7) : 6296-6309 .
MLA Zhao, Xue Hui et al. "Electrochemical Corrosion Behavior of 15Cr-6Ni-2Mo Stainless Steel with/without Stress under the coexistence of CO2 and H2S" . | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 13 . 7 (2018) : 6296-6309 .
APA Zhao, Xue Hui , Feng, YaoRong , Tang, ShaWei , Zhang, JianXun . Electrochemical Corrosion Behavior of 15Cr-6Ni-2Mo Stainless Steel with/without Stress under the coexistence of CO2 and H2S . | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE , 2018 , 13 (7) , 6296-6309 .
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High-Temperature Low-Cycle Fatigue Behavior of HS80H Ferritic–Martensitic Steel Under Dynamic Strain Aging EI SCIE Scopus
期刊论文 | 2018 , 27 (12) , 6629-6635 | Journal of Materials Engineering and Performance
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Abstract :

© 2018, ASM International. In this work, low-cycle fatigue tests were performed on HS80H ferritic–martensitic steel with the strain amplitudes ranging from 0.5 to 2.0% at room temperature and 350 °C. The cyclic stress response at 350 °C was found to be different from that at room temperature due to the effect of dynamic strain aging and showed a significant secondary hardening when the strain values were 0.5 and 0.7%. Furthermore, the dynamic strain aging effect also resulted in an abnormal increase in fatigue life when the strain was 0.7%, which was due to the change in elastic strain. Additionally, the elastic strain and fatigue life were bilinear relations in the double logarithmic coordinates. Finally, the transmission electron microscope observations showed that the dynamic strain aging led to the change in substructure, while the grain was refined.

Keyword :

cyclic stress response dynamic strain aging fatigue life low-cycle fatigue

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GB/T 7714 Wei, Wenlan , Feng, Yaorong , Han, Lihong et al. High-Temperature Low-Cycle Fatigue Behavior of HS80H Ferritic–Martensitic Steel Under Dynamic Strain Aging [J]. | Journal of Materials Engineering and Performance , 2018 , 27 (12) : 6629-6635 .
MLA Wei, Wenlan et al. "High-Temperature Low-Cycle Fatigue Behavior of HS80H Ferritic–Martensitic Steel Under Dynamic Strain Aging" . | Journal of Materials Engineering and Performance 27 . 12 (2018) : 6629-6635 .
APA Wei, Wenlan , Feng, Yaorong , Han, Lihong , Zhang, Jianxun , Wang, Hang . High-Temperature Low-Cycle Fatigue Behavior of HS80H Ferritic–Martensitic Steel Under Dynamic Strain Aging . | Journal of Materials Engineering and Performance , 2018 , 27 (12) , 6629-6635 .
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Butt Welding of 2205/X65 Bimetallic Sheet and Study on the Inhomogeneity of the Properties of the Welded Joint EI SCIE Scopus
期刊论文 | 2017 , 26 (4) , 1801-1807 | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | IF: 1.34
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Abstract :

The explosively welded 2205 duplex stainless steel/X65 pipe steel bimetallic sheets were butt jointed by multilayer and multi-pass welding (gas tungsten arc welding for the flyer and gas metal arc welding for the transition and parent layers of the bimetallic sheets). The microstructure and mechanical properties of the welded joint were investigated. The results showed that in the thickness direction, microstructure and mechanical properties of the welded joint exhibited obvious inhomogeneity. The microstructures of parent filler layers consisted of acicular ferrite, widmanstatten ferrite, and a small amount of blocky ferrite. The microstructure of the transition layer and flyer layer consisted of both austenite and ferrite structures; however, the transition layer of weld had a higher volume fraction of austenite. The results of the microhardness test showed that in both weld metal (WM) and heat-affected zone (HAZ) of the parent filler layers, the average hardness decreased with the increasing (from parent filler layer 1 to parent filler layer 3) welding heat input. The results of hardness test also indicated that the hardness of the WM and the HAZ for the flyer and transition layers was equivalent. The tensile test combined with Digital Specklegram Processing Technology demonstrated that the fracturing of the welded joint started at the HAZ of the flyer, and then the fracture grew toward the base metal of the parent flyer near the parent HAZ. The stratified impact test at -5 A degrees C showed that the WM and HAZ of the flyer exhibited lower impact toughness, and the fracture mode was ductile and brittle mixed fracture.

Keyword :

bimetallic sheet butt welding mechanical property microstructure inhomogeneity

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GB/T 7714 Gou, Ning-Nian , Zhang, Jian-Xun , Wang, Jian-Long et al. Butt Welding of 2205/X65 Bimetallic Sheet and Study on the Inhomogeneity of the Properties of the Welded Joint [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2017 , 26 (4) : 1801-1807 .
MLA Gou, Ning-Nian et al. "Butt Welding of 2205/X65 Bimetallic Sheet and Study on the Inhomogeneity of the Properties of the Welded Joint" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 26 . 4 (2017) : 1801-1807 .
APA Gou, Ning-Nian , Zhang, Jian-Xun , Wang, Jian-Long , Bi, Zong-Yue . Butt Welding of 2205/X65 Bimetallic Sheet and Study on the Inhomogeneity of the Properties of the Welded Joint . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2017 , 26 (4) , 1801-1807 .
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Effect of microstructural features on hardness in simulated heat affected zone of an advanced low-alloyed steel EI SCIE Scopus
期刊论文 | 2017 , 697 , 86-89 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 4 SCOPUS Cited Count: 4
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Abstract :

The low-alloyed creep-resistant T24 steel was designed as prospective material for membrane water walls in modern ultra-super critical power generation. In this study, T24 steel was subjected to welding thermal simulation. After simulation, short time thermal exposure at different temperatures was conducted to study the effect of microstructural evolution on related hardness in the simulated heat affected zone. The results of Vickers hardness tests measurements exhibit a slight decrease at 750 degrees C in base T24 steel. While, the hardness decreases obviously at 650 degrees C in the heat-affected zone after welding thermal simulation due to the carbide formation at the grain interior and coarsening at grain boundaries with the increasing thermal exposure time. At 750 degrees C, the coarsening of bainite lath in thickness direction occurs in base steel and heat-affected zone after welding thermal simulation. Detailed microstructure features at the grain interior and grain boundaries were investigated and analyzed. (C) 2016 Elsevier B.V. All rights reserved.

Keyword :

Heat-affected zone T24 steel Welding thermal simulation Microstructure Transmission electron microscopy (TEM) Hardness

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GB/T 7714 Yu, Z. S. , Sun, F. , Zhang, J. X. et al. Effect of microstructural features on hardness in simulated heat affected zone of an advanced low-alloyed steel [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 697 : 86-89 .
MLA Yu, Z. S. et al. "Effect of microstructural features on hardness in simulated heat affected zone of an advanced low-alloyed steel" . | JOURNAL OF ALLOYS AND COMPOUNDS 697 (2017) : 86-89 .
APA Yu, Z. S. , Sun, F. , Zhang, J. X. , Wang, H. Z. , Yuan, Y. , Zhao, L. et al. Effect of microstructural features on hardness in simulated heat affected zone of an advanced low-alloyed steel . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 697 , 86-89 .
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Microstructure and property inhomogeneity investigations of bonded Zr/Ti/steel trimetallic sheet fabricated by explosive welding EI SCIE Scopus
期刊论文 | 2017 , 698 , 835-851 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 9 SCOPUS Cited Count: 9
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Abstract :

Compared to Ti/steel bimetallic sheets, Zr/Ti/steel trimetallic sheets have improved service performance in severely corrosive environments because the corrosion resistance of zirconium and titanium are complementary. The inhomogeneities of the microstructure and mechanical properties as well as the underlying mechanism of the interactions in the Zr/Ti/steel trimetallic composite sheets fabricated by explosive welding were investigated. The shear strength of the Ti/steel interface and Zr/Ti interface was found to be anisotropic and isotropic respectively, which could be explained by the wide and unambiguous wavy morphology of the former and relatively narrow and obscure wavy morphology of the latter. A transient strain field on the bending specimen was achieved through the digital image correlation (DIC) method during a bending test and it was found that the change of von Mises strain across the Ti/steel interface was much more significant than that across the Zr/Ti interface. This could be related to the through-thickness heterogeneous mechanical properties verified by Vickers hardness tests and tensile tests of the stratified samples of the Zr/Ti/steel plate. Large blocks of Fe-Ti intermetallic compounds were formed in the local melted zone (LMZ) at the Ti/steel interface, while uncoordinated plastic deformation across the interface resulted in the failure appearing at the Ti/steel interface during the bending test. Importantly, the values of shear strength and impact energy of the studied Zr/Ti/steel sheet met the requirements of ASME S264. (C) 2016 Elsevier B.V. All rights reserved.

Keyword :

Mechanical properties Zr/Ti/steel composite sheet Intermetallic compounds Strain inhomogeneity between layers Explosive welding Microstructure

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GB/T 7714 Ning, Jie , Zhang, Lin-jie , Xie, Miao-xia et al. Microstructure and property inhomogeneity investigations of bonded Zr/Ti/steel trimetallic sheet fabricated by explosive welding [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 698 : 835-851 .
MLA Ning, Jie et al. "Microstructure and property inhomogeneity investigations of bonded Zr/Ti/steel trimetallic sheet fabricated by explosive welding" . | JOURNAL OF ALLOYS AND COMPOUNDS 698 (2017) : 835-851 .
APA Ning, Jie , Zhang, Lin-jie , Xie, Miao-xia , Yang, Han-Xin , Yin, Xian-qing , Zhang, Jian-xun . Microstructure and property inhomogeneity investigations of bonded Zr/Ti/steel trimetallic sheet fabricated by explosive welding . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 698 , 835-851 .
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Mechanism of Stress Relief Cracking in a Granular Bainitic Steel EI SCIE Scopus CSCD
期刊论文 | 2017 , 30 (2) , 156-163 | ACTA METALLURGICA SINICA-ENGLISH LETTERS | IF: 1.341
WoS CC Cited Count: 2
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Abstract :

Coarse-grained heat-affected zone (CGHAZ) of a low alloyed, granular bainitic steel T24 was simulated in a Gleeble apparatus. The stress relief of the CGHAZ was analyzed by annealing the samples. The morphology and behavior of the microstructure near the grain boundaries during stress relief were investigated by means of focused ion beam, in situ tensile testing, transmission electron microscopy, scanning electron microscopy and electron back-scatter diffraction. It was observed that there were large martensite/austenite islands distributed along the grain boundaries of CGHAZ. During stress relief at elevated temperature, the retained austenite at the grain boundaries decomposed into M3C carbides and a ferrite forming softening zone. Together with the stress relief, piled up of dislocations occurred within the ferrite in the area adjacent to the ferrite/M3C interface, which resulted in high level of stress accumulation and caused crack initiation along the grain boundaries. These results indicate that the stress relief induced the grain boundary crack is controlled by other mechanisms rather than the creep-like grain boundary sliding.

Keyword :

Heat-affected zone Granular bainitic steel Behavior of grain boundary Stress relief cracking Martensite/austenite island

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GB/T 7714 Yu, Zai-Song , Zhang, Jian-Xun , Wang, Hong-Zhe et al. Mechanism of Stress Relief Cracking in a Granular Bainitic Steel [J]. | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2017 , 30 (2) : 156-163 .
MLA Yu, Zai-Song et al. "Mechanism of Stress Relief Cracking in a Granular Bainitic Steel" . | ACTA METALLURGICA SINICA-ENGLISH LETTERS 30 . 2 (2017) : 156-163 .
APA Yu, Zai-Song , Zhang, Jian-Xun , Wang, Hong-Zhe , Zhou, Rong-Can , Yuan, Yong . Mechanism of Stress Relief Cracking in a Granular Bainitic Steel . | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2017 , 30 (2) , 156-163 .
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Large-Deflection Bending of Clamped Metal Foam-Filled Rectangular Tubes EI SCIE Scopus
期刊论文 | 2017 , 9 (3) | INTERNATIONAL JOURNAL OF APPLIED MECHANICS
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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Large-deflection bending of fully clamped slender metal foam-filled rectangular tubes is investigated theoretically, experimentally and numerically. A plastic yield criterion for the foam-filled rectangular tube is proposed. Considering the filled foam strength effect and the interaction of bending and stretching, an analytical solution is proposed to predict the structural response of the foam-filled rectangular tubes transversely loaded by a flat punch. Clamped bending tests of aluminium alloy foam-filled rectangular tubes are conducted. The analytical model captures experimental results reasonably. Numerical calculations are carried out to predict the large-deflection behavior of the foam-filled tubes, and good agreement is achieved between the analytical solutions and numerical results. The effects of wall thickness of tube, punch size and filled foam strength are discussed in detail. It is demonstrated that the present analytical model can reasonably predict the post-yield behavior of the foam-filled rectangular tube.

Keyword :

structural plasticity metal foam yield criterion Foam-filled tube clamped bending test

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GB/T 7714 Zhang, Jianxun , Qin, Qinghua , Yang, Yan et al. Large-Deflection Bending of Clamped Metal Foam-Filled Rectangular Tubes [J]. | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2017 , 9 (3) .
MLA Zhang, Jianxun et al. "Large-Deflection Bending of Clamped Metal Foam-Filled Rectangular Tubes" . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS 9 . 3 (2017) .
APA Zhang, Jianxun , Qin, Qinghua , Yang, Yan , Yu, Xuehui , Chen, Shangjun , Wang, T. J. . Large-Deflection Bending of Clamped Metal Foam-Filled Rectangular Tubes . | INTERNATIONAL JOURNAL OF APPLIED MECHANICS , 2017 , 9 (3) .
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Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding EI SCIE Scopus
期刊论文 | 2017 , 120 , 144-156 | MATERIALS & DESIGN | IF: 4.525
WoS CC Cited Count: 12 SCOPUS Cited Count: 13
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2A97 Al-Li joints were achieved by using a fibre laser welding with filler wire (non-autogenous) and without filler wire (autogenous), of which the microstructures, mechanical properties and underlying relationships were examined. The results of microhardness tests showed that the fusion zones (FZ) in both types of joints were relatively soft. The width of the softened zone and the degree of softening with autogenous laser welding (ALW) was approximately 1/3 and 3/4 those with non-autogenous laser welding (NLW), respectively. The main reason for the softening was that the alloying elements were more concentrated in the grain boundary but non uniformly distributed. Both types of welded joints fractured in the FZ during tensile processes, and the tensile strengths of the NLW joint decreased about 17% that of the ALW joint, while the elongation increased about 30%. By using high-speed imaging in low-cycle fatigue tests, it was found that cracks originated near the pores and slowly propagated in the NLW joint, whereas cracks first appeared in the FZ, and then rapidly propagated to the EQZ in the ALW joint. Satisfactory strength and plasticity in NLW joints can be expected by careful selection of the welding parameters and the alloy elements in the filler wire. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Mechanical performance Cracks Laser welding Microstructure 2A97 Al-Li alloy

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GB/T 7714 Ning, Jie , Zhang, Lin-jie , Bai, Qing-lin et al. Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding [J]. | MATERIALS & DESIGN , 2017 , 120 : 144-156 .
MLA Ning, Jie et al. "Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding" . | MATERIALS & DESIGN 120 (2017) : 144-156 .
APA Ning, Jie , Zhang, Lin-jie , Bai, Qing-lin , Yin, Xian-qing , Niu, Jing , Zhang, Jian-xun . Comparison of the microstructure and mechanical performance of 2A97 Al-Li alloy joints between autogenous and non-autogenous laser welding . | MATERIALS & DESIGN , 2017 , 120 , 144-156 .
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