热输入对2205双相不锈钢MIG焊接接头组织及力学性能的影响

材料与冶金学报, 2016, 15(2): 137-142. doi: 10.14186/j.cnki.1671-6620.2016.02.012

热输入对2205双相不锈钢MIG焊接接头组织及力学性能的影响

王建军 ^1, , 温艳慧 ^2, , 吴天海 ^3, , 李国平 ^4, , 姜周华 ^5, , 刘春明 ^6,

1.东北大学材料科学与工程学院,沈阳 110819;东北大学材料各向异性与织构教育部重点实验室,沈阳 110819

2.东北大学材料科学与工程学院,沈阳,110819

3.东北大学材料科学与工程学院,沈阳,110819

4.山西太钢不锈钢股份有限公司,太原,030003

5.东北大学冶金学院,沈阳,110819

6.东北大学材料科学与工程学院,沈阳 110819;东北大学材料各向异性与织构教育部重点实验室,沈阳 110819

基金项目: 中央高校基本科研业务费专项资金资助项目(N140206001,L1502045) 2011计划钢铁共性技术协同创新资助项目国家科技支撑计划项目(2012BAE04B01)

关键词： 2205双相不锈钢 , MIG , 热输入 , 魏氏奥氏体 , 力学性能

Influence of heat input on microstructure and mechanical properties of 2205 DSS metal inert-gas welding joints

Keywords： 2205 duplex stainless steel , MIG , heat input , widmanstatten austenite , microhardness

采用MIG焊接方法,对2205双相不锈钢进行了不同热输入条件下的焊接试验,对焊接接头的显微组织进行了观察与分析,并对其力学性能进行了测试.结果表明:不完全重结晶区中带状奥氏体边缘起伏随热输入的增大逐渐增强,宽度逐渐增大;焊缝中心的奥氏体大多为等轴状的块状奥氏体,而靠近熔合线则主要为魏氏奥氏体,随着热输入的增大,魏氏奥氏体逐渐减少,而块状奥氏体逐渐增多;随着热输入的增大,焊接接头的抗拉、屈服强度均有轻微降低,而断后延伸率略有升高;焊接接头的显微硬度从母材到焊缝金属先升高后降低,热影响区的显微硬度最高,硬度的变化与焊接接头各区域中奥氏体体积分数有关,随着热输入的增大,各区域中奥氏体体积分数逐渐升高,显微硬度则相应有所降低.

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