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Microstructure and Mechanical Characteristics of Dissimilar TIG Welded 9% Cr Heat-Resistant Steels Joints

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Abstract

Dissimilar 9% Cr heat-resistant steels (G115 and CB2) with good creep properties for ultra-supercritical steam turbines were butt-joined by tungsten inert gas welding. The microstructure of welded metal (WM) was quenched martensite without carbide precipitates and lath packets existed inside prior austenite grains (PAGs), which leaded to higher hardness of WM. Partially melted zone at G115 side was composed of untempered martensite within equiaxed PAGs. The lowest hardness occurred in both G115 and CB2 steels which was attributed to tempered martensite with many M23C6 precipitates. The heat-affected zone consisted of three sub-grains and their microstructure was detailly analyzed in current work. As current increased from 130 to 150 A, both the tensile strength at room temperature and 650 ℃ increased while strength had no obvious change with further increasing current. The values of 673 MPa and 309 MPa corresponded to the tensile stress with 150 A at room temperature and 650 ℃, respectively. The fracture mode of joints at room temperature was cleavage and ductile failure at 130 and 150 A, respectively. The high-temperature fracture surface at 150 A was composed of deep and fine dimples.

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Acknowledgements

This research was supported by the Sichuan Deyang Open University-City Cooperative Technology Research and Development Project (Project No.: 2018CKJ004) and the Sichuan Deyang Industry-University-Research Cooperation Technology Research and Development Project (Project No.: 2019CK094). The authors also acknowledge the fund of Sate Key Laboratory of Long-life High Temperature Materials (Project No.: DTCC28EE190934) and the Fundamental Research Funds for the Central Universities (Project No.: 2019CDXYCL0031).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400044, People’s Republic of China

    Ting Li, Xinjian Yuan, Rui Li, Shiwei Tao & Kanglong Wu

  2. Manufacturing Technology Department, Dongfang Turbine Co., Ltd, No. 666, Jinshajiangxi Road, Deyang, 618000, People’s Republic of China

    Jiankun Xiong

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  1. Ting Li
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  2. Xinjian Yuan
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Correspondence to Xinjian Yuan or Jiankun Xiong.

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Li, T., Yuan, X., Li, R. et al. Microstructure and Mechanical Characteristics of Dissimilar TIG Welded 9% Cr Heat-Resistant Steels Joints. Int. J. Precis. Eng. Manuf. 22, 1007–1019 (2021). https://doi.org/10.1007/s12541-021-00517-x

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