2205双相不锈钢TIG焊接头组织及力学性能*

doi:10.11901/1005.3093.2016.252

材料研究学报

2016, Vol. 30

Issue (12): 897-903 DOI: 10.11901/1005.3093.2016.252

本期目录 | 过刊浏览

2205双相不锈钢TIG焊接头组织及力学性能*

李国平¹,王建军^2,³(

),吴天海²,温艳慧²,李花兵⁴,刘春明^2,³

1. 山西太钢不锈钢股份有限公司太原 030003
2. 东北大学材料科学与工程学院沈阳 110819
3. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819
4. 东北大学冶金学院沈阳 110819

Microstructure and Mechanical Properties of 2205 DSS Metal Inert-gas Welding Joints

Guoping LI¹,Jianjun WANG^2,^3,^*(

),Tianhai WU²,Yanhui WEN²,Huabing LI⁴,Chunming LIU^2,³

1. Shanxi Taigang Stainless Steel Co. Ltd, Taiyuan 030003, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China
4. School of Metallurgy, Northeastern University, Shenyang 110819, China

引用本文:

李国平,王建军,吴天海,温艳慧,李花兵,刘春明. 2205双相不锈钢TIG焊接头组织及力学性能*[J]. 材料研究学报, 2016, 30(12): 897-903.
Guoping LI, Jianjun WANG, Tianhai WU, Yanhui WEN, Huabing LI, Chunming LIU. Microstructure and Mechanical Properties of 2205 DSS Metal Inert-gas Welding Joints[J]. Chinese Journal of Materials Research, 2016, 30(12): 897-903.

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摘要:

对2205双相不锈钢进行了4组不同热输入条件下的TIG焊接实验, 采用光学显微镜、扫描电镜和透射电镜对焊接接头的显微组织进行了观察与分析, 并测试了焊接接头的拉伸力学性能和显微硬度。结果表明: 在热影响区, 随着热输入的增大, 不完全再结晶区带状奥氏体宽度逐渐增大, 粗晶区铁素体晶粒的粗化程度逐渐加剧、奥氏体体积分数逐渐增多; 在焊缝金属中, 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, 魏氏奥氏体在高温下稳定性差, 容易被相界处形成的窄条铁素体分割成块状奥氏体。随着热输入的增大, 焊接接头的屈服、抗拉强度逐渐降低, 断后延伸率逐渐升高。铁素体体积分数较高的热影响区显微硬度最大, 焊缝金属的合金元素含量较高, 因此其显微硬度高于母材。

关键词 ：金属材料, 双相不锈钢, TIG焊, 热输入, 魏氏奥氏体, 力学性能

Abstract：

2205 DSS plates were welded with four different heat inputs using TIG welding. The microstructures of welding joints were carefully observed by means of OM, SEM, and TEM. The tensile properties and microhardness of welding joints were tested and analyzed in detail. The results show that with the increasing of heat input, the width of strip austenite in incomplete recrystallization zone increases and the grain size of ferrite and the volume fraction of austenite in coarse grain zone increase gradually, while Widmanstatten austenite decreases and blocky austenite increases in weld metal. Widmanstatten austenite is unstable at high temperature and divided into blocks with the formation of fine strip ferrite at the phase boundary. The tensile strength and yield strength decrease while the elongation increases with the increasing of heat input. According to the results of microhardness, the maximum of microhardness appears in the HAZ where ferrite volume fraction is the highest. The microhardness in weld metal is higher than that in base metal due to the relatively higher amounts of alloy elements.

Key words： metallic materials 2205 duplex stainless steel TIG welding heat input Widmanstatten austenite mechanical property

收稿日期: 2016-05-11

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

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.252 或 https://www.cjmr.org/CN/Y2016/V30/I12/897

表1 母材及焊丝的化学成分(质量分数, %)

表2 TIG焊接工艺参数

图1 不同热输入条件下热影响区的显微组织

图2 不同热输入条件下焊缝金属的显微组织

图3 热输入为3.4 kJ/mm时焊缝金属的TEM像

图4 晶粒晶体学取向的EBSD测量结果

图5 焊接接头拉伸力学性能随热输入的变化曲线

图6 不同热输入下焊接接头不同区域中显微硬度的变化曲线

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