金属加工（热加工）Issue(5)：119-124,131,7.
激光选区熔化成形Al-Mg-Sc合金与O态5A06板材TIG焊工艺研究
Process research for selective laser melting formed Al-Mg-Sc alloy and 5A06 alloy with O heat treatment sheet TIG welding
田志杰 1马月婷 2王凯 2刘紫阳 2赵鑫 2张博禹2
作者信息
- 1. 首都航天机械有限公司 北京 100076||先进焊接与连接国家重点实验室 北京 100076
- 2. 首都航天机械有限公司 北京 100076
- 折叠
摘要
Abstract
A selective laser melting formed Al-Mg-Sc alloy sheet and 5A06 with O heat treatment sheet with the thickness of 1.2mm were welded by tungsten inert gas(TIG)welding with 5B71 filler wire.The microstructure evolution and refinement characteristics of the welded joints were investigated.The results showed that a large number of pores with the diameter of 0.2mm distributed near the front surface of the weld zone and the fusion line of the SLM Al-Mg-Sc and 5A06 with O heat treatment sheet weld sample with appropriate TIG welding parameters.The number and size of pores and inclusions near the fusion line of SLM side were larger than that of 5A06 side and base metals in the welded joint.The microstructure of weld zone was equiaxed grains,which was optimized by the micro-alloying elements of Sc and Zr.The subcooled zone of molten pool was ultrafine grain region composed of the average finer grain with a diameter of about 20μm.Meanwhile,the other zones of molten pool mainly consisted of equiaxed grains with a diameter of 40～50μm.It was found that some concentrated pores,no shear lip and some dimples were present on the surface of fracture sample.Furthermore,some strengthening phases were observed in the dimples.It was indicated that the fracture mode was brittle-ductile mixed.关键词
Al-Mg-Sc合金/SLM/TIG/微观组织/晶粒Key words
Al-Mg-Sc alloy/SLM/TIG/microstructure/grain引用本文复制引用
田志杰,马月婷,王凯,刘紫阳,赵鑫,张博禹..激光选区熔化成形Al-Mg-Sc合金与O态5A06板材TIG焊工艺研究[J].金属加工（热加工）,2025,(5):119-124,131,7.
