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百毫米级304不锈钢超窄间隙激光焊接头的组织及性能

Microstructures and Mechanical Properties of Hundred-Millimeter-Grade 304 Stainless Steel Joints by Ultra-Narrow Gap Laser Welding

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摘要

采用超窄间隙激光焊对100 mm厚304奥氏体不锈钢进行了焊接试验, 并研究了接头的显微组织和力学性能。结果表明, 超窄间隙激光焊可以实现百毫米级及以上厚板的有效连接且焊缝的成形良好。接头的显微组织由奥氏体和少量铁素体组成, 晶粒呈胞状和等轴状。接头的拉伸强度为658 MPa。拉伸断裂位于焊缝的胞状晶区, 断裂形式为典型的延性断裂, 断口形貌为细小均匀的韧窝和撕裂棱。焊缝组织中等轴晶区的显微硬度大于胞状晶区。

Abstract

The 100 mm thickness SUS304 stainless steels are welded by the ultra-narrow gap laser welding, and the microstructures and mechanical properties of the joints are analyzed. The results show that the hundred-millimeter-grade thickness plates can be effectively welded by the ultra-narrow gap laser welding and the welds present good surface appearances. The microstructures of the joints are composed of austenite and small amount of ferrite, and the grains are with the cellular equiaxed shapes. The tensile strength of the joints is 658 MPa and the tensile fracture is located at the cellular grain zone near the fusion line. The fracture morphology shows fine equiaxed dimples and tearing ridges, which indicates that the fracture is ductile. The microhardness at the equiaxed grain zone is obviously higher than that at the cellular grain zone.

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中图分类号:TG456.7

DOI:10.3788/cjl201845.0702005

所属栏目:激光制造

收稿日期:2018-01-12

修改稿日期:2018-02-02

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杨武雄:北京工业大学激光工程研究院, 北京 100124
信纪军:中国科学院等离子体物理研究所, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026特种焊接技术安徽省重点实验室, 安徽 淮南 232000
方超:中国科学院等离子体物理研究所, 安徽 合肥 230031特种焊接技术安徽省重点实验室, 安徽 淮南 232000
戴文华:中国科学院等离子体物理研究所, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026特种焊接技术安徽省重点实验室, 安徽 淮南 232000
卫靖:中国科学院等离子体物理研究所, 安徽 合肥 230031特种焊接技术安徽省重点实验室, 安徽 淮南 232000
吴杰峰:中国科学院等离子体物理研究所, 安徽 合肥 230031特种焊接技术安徽省重点实验室, 安徽 淮南 232000
宋云涛:中国科学院等离子体物理研究所, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026特种焊接技术安徽省重点实验室, 安徽 淮南 232000

联系人作者:方超(fangchao@ipp.ac.cn)

备注:杨武雄(1976-), 男, 博士, 助理研究员, 主要从事先进激光制造技术方面的研究。E-mail: bbgei@126.com

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引用该论文

Yang Wuxiong,Xin Jijun,Fang Chao,Dai Wenhua,Wei Jing,Wu Jiefeng,Song Yuntao. Microstructures and Mechanical Properties of Hundred-Millimeter-Grade 304 Stainless Steel Joints by Ultra-Narrow Gap Laser Welding[J]. Chinese Journal of Lasers, 2018, 45(7): 0702005

杨武雄,信纪军,方超,戴文华,卫靖,吴杰峰,宋云涛. 百毫米级304不锈钢超窄间隙激光焊接头的组织及性能[J]. 中国激光, 2018, 45(7): 0702005

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