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9Ni钢超窄间隙光纤激光焊接接头组织及性能

Microstructure and Property of 9Ni Steel Joint by Ultra-Narrow-Gap Fiber Laser Welding

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摘要

采用YLS-10000光纤激光器和ERNiMo-8焊丝,对液化天然气船液罐用9Ni钢进行了超窄间隙激光焊接,研究了接头组织和性能。结果表明,优化焊接参数可以得到侧壁熔合良好的超窄间隙接头。焊缝组织主要为奥氏体,两侧结晶形态为柱状晶,中心为等轴晶。热影响区分为明显的粗晶区和细晶区,组织均为马氏体和少量残余奥氏体,硬度均值约为340 HV,远高于母材均值(230 HV)和焊缝均值(200 HV)。拉伸试样均断于焊缝,接头抗拉强度略低于母材的。随着与焊缝中心距离的增大,接头的低温冲击功增大,且均值都在70 J以上。断口形貌均为细小的韧窝,接头为韧性断裂。

Abstract

By using YLS-10000 fiber lasers and ERNiMo-8 filler wire, the ultra-narrow-gap laser welding of 9Ni steel for liquid container of liquefied natural gas (LNG) vessels is conducted and the microstructure and property of the welded joint are studied. The results show that, the ultra-narrow-gap welded joint with good fusion sidewalls can be obtained by optimizing weld parameters. The microstructure of weld is austenite, and crystallization morphology on two sides is columnar crystal, while that at center is equiaxed crystal. The heat affected zone (HAZ) is clearly divided into coarse grain zone and fine grain zone, and both of their microstructures are martensite and a small amount of residual austenite, where the average hardness is about 340 HV, much higher than that of the base metal (230 HV) and that of the weld (200 HV). Fractures occur on welds of tensile test specimens, and the tensile strength of the joint is slightly lower than that of the base metal. The low-temperature impact energy of the joint increases with its distance from the weld center increase, with an average value of above 70 J. The fracture morphology is always tiny dimple and the fracture of the joint is ductile.

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中图分类号:TG456.7

DOI:10.3788/lop54.041408

所属栏目:激光器与激光光学

基金项目:工业和信息化部新型液化天然气船液货围护系统预先研究项目

收稿日期:2016-11-21

修改稿日期:2016-12-23

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田书强:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
李铸国:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240
华学明:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240高新船舶与深海开发装备协同创新中心, 上海 200240

联系人作者:田书强(sjtusqtian@foxmail.com)

备注:田书强(1990-),男,硕士研究生,主要从事9Ni钢激光焊接方面的研究。

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引用该论文

Tian Shuqiang,Li Zhuguo,Hua Xueming. Microstructure and Property of 9Ni Steel Joint by Ultra-Narrow-Gap Fiber Laser Welding[J]. Laser & Optoelectronics Progress, 2017, 54(4): 041408

田书强,李铸国,华学明. 9Ni钢超窄间隙光纤激光焊接接头组织及性能[J]. 激光与光电子学进展, 2017, 54(4): 041408

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