Formation of the anomalous microstructure in the weld metal of Co-based alloy/AISI 410 stainless steel dissimilar welded joint

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Formation of the anomalous microstructure in the weld metal of Co-based alloy/AISI 410 stainless steel dissimilar welded joint

Kai Ding , Yuan-Heng Zhang , Shang-Fei Qiao , Guan-Zhi Wu , Tao Wei , Xia Liu , Yu-Lai Gao

Advances in Manufacturing ›› 2022, Vol. 10 ›› Issue (2) : 250 -259.

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Advances in Manufacturing ›› 2022, Vol. 10 ›› Issue (2) : 250 -259. DOI: 10.1007/s40436-022-00396-z

Article

Formation of the anomalous microstructure in the weld metal of Co-based alloy/AISI 410 stainless steel dissimilar welded joint

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¹ State Key Laboratory of Advanced Special Steel, Shanghai University, 200444, Shanghai, People’s Republic of China

² Shanghai Electric Power Generation Equipment Co., Ltd, Shanghai Turbine Plant, 200240, Shanghai, People’s Republic of China

³ Shanghai Engineering Research Center for Metal Parts Green Remanufacture, 200444, Shanghai, People’s Republic of China

^g ylgao@shu.edu.cn

Kai Ding received his B. Eng. from Anhui University of Technology, China, in 2015, and obtained his Ph.D. from the School of Materials Science and Engineering, Shanghai University, China, in 2020. His work focuses on the property measurement and structure characterization of the metallic materials.

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Yuan-Heng Zhang received his B. Eng. from Hefei University of Technology, China, in 2017, and obtained his M. Eng. from the School of Materials Science and Engineering, Shanghai University, China, in 2020. His work focuses on the field of welding especially for the dissimilar welding between the steels and Ni-based alloys.

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Shang-Fei Qiao obtained his B. Eng. and M. Eng. from the School of Materials Science and Engineering, Harbin Institute of Technology, China, in 2000 and 2002 respectively. He is a senior engineer at Shanghai Electric Power Generation Equipment Co., Ltd., China. His work focuses on the laser cladding and welding technology for turbine components.

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Guan-Zhi Wu received his B. Eng. from Harbin Institute of Technology, China, in 2018, and obtained his M. Eng. from the School of Materials Science and Engineering, Shanghai University, China, in 2021. His research interests focus on the field of welding techniques involving the electron beam welding and submerged arc welding.

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Tao Wei received his B. Eng. from Shanghai Maritime University, China, in 2018, and obtained his M. Eng. from the School of Materials Science and Engineering, Shanghai University, China, in 2021. His work focuses on the materials characterization of the dissimilar welded joints.

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Xia Liu is a professor and also the senior engineer of Shanghai Electric Power Generation Equipment Co. Ltd, China. She obtained M. Eng. at the School of Materials Science and Engineering, Shanghai Jiaotong University in 2007, graduated from Mechanics School of Tsinghua University in 2019. Her interests focus on the welding technology research and development of key parts of turbines in fields of fossil-fired, nuclear and gas turbine power station.

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Yu-Lai Gao received his B. Eng. from Shandong University of Technology, China, in 1998, and obtained his M. Eng. and Ph.D. from the School of Materials Science and Engineering, Harbin Institute of Technology, China, in 2000 and 2003 respectively. His background is in metal solidification and structure control, materials characterization, metal welding and nanomaterials etc. Currently he works on the correlation between the structure and properties of metallic materials in Shanghai University, China.

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Abstract

The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding (EBW) technique. The anomalous microstructure containing the element transition zone (ETZ) and/or core of tail-like zone (CTLZ) is in the weld metal (WM) adjacent to the fusion line. The melting temperature difference between the WM and AISI 410 steel, melt stirring effect and element diffusion can trigger the formation of such anomalous microstructure. In particular, the larger distance of the region in WM away from the fusion line, the smaller CTLZ and larger ETZ occurred. Compared with the fine and ellipsoidal precipitates in the as-welded CTLZ, a large number of chain-type clustered precipitates were detected in the CTLZ and ETZ interface after the aging treatment at 566 °C for 1 000 h. The element diffusion under elevated temperature in WM is regarded as the crucial factor for such anomalous microstructure evolution during the aging treatment.

Keywords

Anomalous microstructure / Aging treatment / Dissimilar welded joint / Co-based alloy / AISI 410 stainless steel

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Kai Ding, Yuan-Heng Zhang, Shang-Fei Qiao, Guan-Zhi Wu, Tao Wei, Xia Liu, Yu-Lai Gao. Formation of the anomalous microstructure in the weld metal of Co-based alloy/AISI 410 stainless steel dissimilar welded joint. Advances in Manufacturing, 2022, 10(2): 250-259 DOI:10.1007/s40436-022-00396-z

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Funding

National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809(U1760102)

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