| 焊前热处理对440C不锈钢电子束焊接接头组织与性能的影响 |
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| 引用本文： | 代一博,房卫萍,彭翰林,胡永俊,易耀勇,易朋.焊前热处理对440C不锈钢电子束焊接接头组织与性能的影响[J].焊接学报,2022,43(10):63-70. |
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| 作者姓名： | 代一博 房卫萍 彭翰林 胡永俊 易耀勇 易朋 |
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| 作者单位： | 1.广东工业大学, 广州, 510006 |
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| 基金项目： | 广州市对外科技合作项目(201907010010)，广东省重点领域研发计划项目(2018B090904004)，国家重点研发计划项目(2020YFE0205300). |
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| 摘 要： | 研究了焊前退火和调质2种热处理工艺对440C不锈钢电子束焊接接头的组织和力学性能的影响，分析了2种状态下的组织演变规律、接头拉伸力学性能和硬度分布特点. 结果表明:2种热处理状态的板材经过电子束焊接后，焊缝成形良好，焊缝区域均为马氏体和残留奥氏体组织，呈现出非平衡凝固组织，碳及合金元素以固溶形式存在于马氏体及残余奥氏体中，焊缝区域硬度达到398 HV. 焊前经调质热处理后，母材基体由铁素体转变成回火马氏体和残余奥氏体混合组织，同时部分碳化物固溶在基体组织中，使基体组织硬度提高了60％. 与焊前退火态相比，焊前调质热处理板材经电子束焊接后，可使焊接接头抗拉强度提高20％，焊接热影响区硬度提高35％，但接头的塑性变形能力有所下降，断裂均发生在热影响区.
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| 关 键 词： | 440C不锈钢 电子束焊接 焊前热处理 显微组织 力学性能 |
| 收稿时间： | 2021-10-20 |
Effect of pre-weld heat treatment on the microstructure and mechanical properties of electron beam welded 440C stainless steel joint |
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| Affiliation: | 1.Guangdong University of Technology, Guangzhou 510006, China2.China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China |
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| Abstract: | The effects of pre-weld heat treatment on microstructure and mechanical properties of electron beam welded 440C stainless steel joint were observed and studied, including annealing as well as quenching and tempering. The characteristics of structure change, joint tension and hardness distribution in the two states are analyzed. The results show that the electron beam weld has a good shape without any microcracks. The microstructure located at the weld consists of martensite and retained austenite, showing a non-equilibrium solidification microstructure, carbon and alloying elements exist in the weld structure in solid solution, and the hardness reaches 398 HV. After quenching and tempering heat treatment before welding, the base metal matrix transforms from ferrite into tempered martensite and retained austenite, and at the same time the carbide part is solid-dissolved into the matrix structure, which increases the matrix structure hardness by 60%. Compared with the annealed state before welding, after electron beam welding, the tensile strength of the welded joint is increased by 20%, and the hardness of the welded heat-affected zone is increased by 35%, but the plastic deformation ability of the joint is reduced, and the fracture occurs in the heat-affected zone. |
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