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Home > Archive>Volume 52, Issue 7, 2023 >2377-2384. DOI:10.12442/j.issn.1002-185X.20220992
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Effect of Welding Thermal Cycle and Peak Temperature on Microstructure of C-HRA-2 Nickel-Based Alloy
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Affiliation:

1.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2.Institute for Special Steels, Central Iron and Steel Research Institute Co., Ltd, Beijing 100081, China;3.Technology Center, Inner Mongolia North Heavy Industries Group Co., Ltd, Baotou 014033, China;4.Key Laboratory of Advanced Metals and Materials of Inner Mongolia, Inner Mongolia University of Science and Technology, Baotou 014010, China

Fund Project:

National Key R&D Program of China (2017YFB0305202); Inner Mongolia Natural Science Foundation (2016MS0510, 2020MS05046); Key Technology Research Program of Inner Mongolia Autonomous Region (2021GG0047); Basic Scientific Research Business Cost Project of Colleges and Universities Directly Under the Inner Mongolia Autonomous Region in 2023

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    Abstract:

    The welding heat-affected zone (HAZ) of C-HRA-2 nickel-based alloy under various primary peak temperatures (Tp1=1150, 1250, and 1350 °C) and the secondary peak temperatures (Tp2=850, 950, 1050, 1150, 1250, 1350, and 1450 °C) was obtained by welding thermal simulation. The effect of peak temperature (Tp) and thermal cycling times on the evolution of simulated HAZ microstructure of C-HRA-2 alloy was investigated. The microhardness of simulated HAZs was measured. The HAZ microstructure and carbide were characterized by the optical microscope, scanning electron microscope, and transmission electron microscope. Results show that the fine M23C6 carbides appear along the grain boundaries in the simulated HAZ with Tp1=1150 °C. For HAZs with Tp1>1250 °C, the γ matrix bonded with M23C6 carbides appears near the grain boundaries due to component liquefaction. When Tp2 is 1050–1250 °C, the carbides similar to those in HAZ with Tp1=1150 °C can be observed near the grain boundaries due to the difference in the solid solubility of Cr in the matrix obtained at Tp1 and Tp2. In HAZ with Tp2>1250 °C, the melted microstructure similar to that with Tp1=1250 °C can be observed near the grain boundaries. The microhardness fluctuates significantly with increasing the Tp2. The microhardness of specimen with Tp2=1250 °C is slightly higher than that of the base material, because of the grain boundary strengthening effect of the carbides near the grain boundaries.

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[Kou Dongxu, Chen Zhongyi, Chen Zhengzong, Li Yongqing, Ma Yonglin, Li Yiming. Effect of Welding Thermal Cycle and Peak Temperature on Microstructure of C-HRA-2 Nickel-Based Alloy[J]. Rare Metal Materials and Engineering,2023,52(7):2377~2384.]
DOI：10.12442/j. issn.1002-185X.20220992

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History
  • Received:December 20,2022
  • Revised:March 20,2023
  • Adopted:March 22,2023
  • Online: July 31,2023
  • Published: July 27,2023

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