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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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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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© 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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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: 3 SCOPUS Cited Count: 3
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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
WoS CC Cited Count: 1
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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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Effects of weld speed on corrosion performance of bimetallic sheet butt joint welded by fiber laser EI Scopus CSCD PKU
期刊论文 | 2017 , 38 (7) , 17-20 | Hanjie Xuebao/Transactions of the China Welding Institution
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Abstract :

The penetration butt welding experiment was carried out on the Dss2205/X65 bimerallic sheet by the fiber laser, The microstructure of weld metal was analyzed with optical microscope. The distribution of the alloying elements element in the welded joints were was analyzed by EDS. The potentiodynamic scanning method was carried out to measurement the anodic polarization curves of welded joints. The experimental results show that the microstrucure of the welded joint exhabits a hierarchical characteristics along thickness direction of welded joints. Polarization curves show that the joints with the welding speed of 1.2 m/min,1.5 m/min, 1.8 m/min showed an better corrosion resistance, and further rmore, With the increase of welding speed, the pitting corrosion resistance of joint is increased. © 2017, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.

Keyword :

Anodic polarization curves Bimetallic plates Corrosion performance Distribution of element Polarization curves Potentiodynamic scanning Thickness direction Welding speed

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GB/T 7714 Gou, Ningnian , Zhang, Jianxun , Li, Zhengang et al. Effects of weld speed on corrosion performance of bimetallic sheet butt joint welded by fiber laser [J]. | Hanjie Xuebao/Transactions of the China Welding Institution , 2017 , 38 (7) : 17-20 .
MLA Gou, Ningnian et al. "Effects of weld speed on corrosion performance of bimetallic sheet butt joint welded by fiber laser" . | Hanjie Xuebao/Transactions of the China Welding Institution 38 . 7 (2017) : 17-20 .
APA Gou, Ningnian , Zhang, Jianxun , Li, Zhengang , Liu, Haizhang , Bi, Zongyue . Effects of weld speed on corrosion performance of bimetallic sheet butt joint welded by fiber laser . | Hanjie Xuebao/Transactions of the China Welding Institution , 2017 , 38 (7) , 17-20 .
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Corrosion and deposition mechanism at position of defect in circumferential weld of gas pipeline EI Scopus CSCD PKU
期刊论文 | 2017 , 38 (4) , 47-50 | Hanjie Xuebao/Transactions of the China Welding Institution
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Metallographic microscope and EDS (energy dispersive spectrometer) were used to investigate the reason which caused the pipe blockage of the gas field in Jingbian. Results showthat there are CO2corrosion, H2S corrosion and crevice corrosion in the natural gas pipeline.The deposits are mainly corrosion products such as iron oxides, iron chlorides and iron sulfides at this stage. As the corrosion continues, the pipe and the fluid inside the pipe are separated by the compact corrosion products. The type of deposits transforms from corrosion products to dust as the corrosion rate drops. When the height of deposits reaches a certain value, the top of the pipe suffers from erosion corrosion because the flow direction of fluid inside the pipe changes. And the corrosion rate accelerates. The thickness of pipe is so thin that it endangers the safety operation of the pipeline. © 2017, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.

Keyword :

Circumferential welds Corrosion mechanisms Corrosion products Deposition mechanism Energy dispersive spectrometers Erosion - corrosions Metallographic microscope Safety operations

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GB/T 7714 Xu, Zhenzhen , Wei, Chao , Zhang, Jianxun . Corrosion and deposition mechanism at position of defect in circumferential weld of gas pipeline [J]. | Hanjie Xuebao/Transactions of the China Welding Institution , 2017 , 38 (4) : 47-50 .
MLA Xu, Zhenzhen et al. "Corrosion and deposition mechanism at position of defect in circumferential weld of gas pipeline" . | Hanjie Xuebao/Transactions of the China Welding Institution 38 . 4 (2017) : 47-50 .
APA Xu, Zhenzhen , Wei, Chao , Zhang, Jianxun . Corrosion and deposition mechanism at position of defect in circumferential weld of gas pipeline . | Hanjie Xuebao/Transactions of the China Welding Institution , 2017 , 38 (4) , 47-50 .
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天然气管道环焊缝缺陷部位的腐蚀沉淀机理 CSCD PKU
期刊论文 | 2017 , (4) , 47-50 | 焊接学报
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Abstract :

为了深入分析天然气管道的"梗阻"现象,采用金相法和能谱仪对靖边某气田典型的有大量沉积物管道进行了焊缝和沉积物结构及成分分析.结果表明,焊缝缺陷处的腐蚀和沉淀机理为管内发生CO2腐蚀、缝隙腐蚀和H2S腐蚀,产生了氧化物、氯化物和硫化物等腐蚀产物.随着腐蚀产物的逐渐堆积,其阻隔了管子材料与腐蚀性介质,使得腐蚀速率减慢,沉积物转为以粉尘为主.沉积物堆积到一定高度时,天然气的流向改变,管道顶部的腐蚀变为冲刷腐蚀,腐蚀速率加快,管道壁厚严重减薄,危害管道的正常安全运行.

Keyword :

腐蚀机理 焊缝 沉积机理 天然气管道

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GB/T 7714 徐甄真 , 卫超 , 张建勋 . 天然气管道环焊缝缺陷部位的腐蚀沉淀机理 [J]. | 焊接学报 , 2017 , (4) : 47-50 .
MLA 徐甄真 et al. "天然气管道环焊缝缺陷部位的腐蚀沉淀机理" . | 焊接学报 4 (2017) : 47-50 .
APA 徐甄真 , 卫超 , 张建勋 . 天然气管道环焊缝缺陷部位的腐蚀沉淀机理 . | 焊接学报 , 2017 , (4) , 47-50 .
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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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Single pass laser-MIG hybrid welding of 8-mm thick pure copper (T2) without preheating: Microstructure and properties EI SCIE Scopus
期刊论文 | 2017 , 126 , 867-883 | APPLIED THERMAL ENGINEERING | IF: 3.771
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Hybrid laser-MIG welding of 8-mm thick highly reflective pure copper (T2) butt joint with a Y-shape groove was conducted. Welding parameters were optimized based on a five factors and four levels orthogonal experimental design. The surface morphology, microstructure, microhardness, mechanical properties, thermal diffusivity, electrical conductivity, and electrochemical performance of welded joint were studied and analyzed systematically. Fusing zone (FZ) and heat affected zone (HAZ) were made of large-sized columnar grains and grown equiaxed grains, respectively. The tensile strength and elongation of welded joint separately took up 82.1% and 96.8% that of base metal (BM). The decreasing mechanical property of the joints was mainly because FZ and HAZ of the joints presented apparent softening, which made the minimum microhardness of FZ and HAZ account for 69.9% and 59.2% that of BM, respectively. The minimum electrical conductivity and average thermal diffusivity of the joints separately decreased by 62.0% and 34.7% that of BM owing to the large amount of microvoids with a diameter ranging from 1 to 2 mu m and impurities including C, Si, Mn and Sn in FZ. The anti-corrosion properties of the joints were lower than that of BM, due to the large-sized grains in FZ and HAZ. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Laser-arc hybrid welding Thermal property Electrical property Thick pure copper Mechanical property

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GB/T 7714 Yang, Jian-Nan , Zhang, Lin-Jie , Ning, Jie et al. Single pass laser-MIG hybrid welding of 8-mm thick pure copper (T2) without preheating: Microstructure and properties [J]. | APPLIED THERMAL ENGINEERING , 2017 , 126 : 867-883 .
MLA Yang, Jian-Nan et al. "Single pass laser-MIG hybrid welding of 8-mm thick pure copper (T2) without preheating: Microstructure and properties" . | APPLIED THERMAL ENGINEERING 126 (2017) : 867-883 .
APA Yang, Jian-Nan , Zhang, Lin-Jie , Ning, Jie , Bai, Qing-Lin , Yin, Xian-Qing , Zhang, Jian-Xun . Single pass laser-MIG hybrid welding of 8-mm thick pure copper (T2) without preheating: Microstructure and properties . | APPLIED THERMAL ENGINEERING , 2017 , 126 , 867-883 .
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天然气管道环焊缝缺陷部位的腐蚀沉淀机理 CSCD PKU
期刊论文 | 2017 , (4) , 47-50+131 | 焊接学报
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Keyword :

腐蚀机理 焊缝 沉积机理 天然气管道

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GB/T 7714 徐甄真 , 卫超 , 张建勋 . 天然气管道环焊缝缺陷部位的腐蚀沉淀机理 [J]. | 焊接学报 , 2017 , (4) : 47-50+131 .
MLA 徐甄真 et al. "天然气管道环焊缝缺陷部位的腐蚀沉淀机理" . | 焊接学报 4 (2017) : 47-50+131 .
APA 徐甄真 , 卫超 , 张建勋 . 天然气管道环焊缝缺陷部位的腐蚀沉淀机理 . | 焊接学报 , 2017 , (4) , 47-50+131 .
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