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| 偏析对纳米贝氏体钢再纳米化焊缝组织性能的影响 |
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方坤1,2, 宋奎晶2, 梁宁1, 杨建国3, 方洪渊2
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1.中国电子科技集团公司第三十八研究所, 合肥 230088;2.哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 150001;3.浙江工业大学化工机械设计研究所, 杭州 310032
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| 摘要: |
| 采用扫描电镜、透射电镜TEM和电子背散射衍射EBSD分析了焊接偏析对纳米贝氏体钢再纳米化焊缝中的残余奥氏体的影响.结果表明,焊接偏析导致了粗大奥氏体的形成,该粗大奥氏体集中分布于枝晶间位置.粗大奥氏体的含碳量低于块状奥氏体,稳定性降低.母材残余奥氏体尺寸为亚微米级且均匀分布,而焊缝残余奥氏体的平均晶粒尺寸为微米级,且分布不均匀.焊接偏析导致的焊缝残余奥氏体的变化对焊缝延伸率有重要影响.力学测试结果表明再纳米化焊缝强度与母材相当,延伸率明显小于母材. |
| 关键词: 纳米贝氏体钢 再纳米化 焊接偏析 残余奥氏体 电子背散射衍射 |
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| 基金项目:科工局成果管理与推广资助项目(JSCG2015203B001) |
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| Effect of welding segregation on microstructure and mechanical properties of regenerated weld for nanostructured bainite steel |
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FANG Kun1,2, SONG Kuijing2, Liang Ning1, YANG Jianguo3, FANG Hongyuan2
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1.The No. 38 Institute, China Electronic Technology Corporation, Hefei 230088, China;2.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;3.Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
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| Abstract: |
| Effect of welding segregation on retained austenitein regenerated weld for nanostructured bainite steel has been investigated by SEM, TEM and EBSD. Welding segregation resulted incoarse retained austenite that distributed at the boundary of the dendrite in the weld. The carbon content of coarse retained austenite is lower than that of the blocky-shape austenite, which reduces stability of the structure. The retained austenite in base metal is in submicronmeter size with a uniform distribution. By contrary, the size of retained austenite in the weld is in micronmeter, and the distribution is not uniform. As a result, the change of the retained austenite in the weld has important effect on the elongation rate of the weld. |
| Key words: nanostructured bainite steel regeneration welding segregation retained austenite EBSD |
