太原理工大学学报2025，Vol.56Issue(4)：716-722,7.DOI:10.16355/j.tyut.1007-9432.20240111
0Cr21Al6不锈钢自熔焊接头脆性及调控机理
Brittleness and Control Mechanism of 0Cr21Al6 Stainless Steel Self-Fusion Joint
摘要
Abstract
[Purposes]Exploring the brittleness of FeCrAl stainless steel is of great significance.Because FeCrAl is an ultra-pure ferritic stainless steel,its weld metal grain is coarse,brittle,easy to generate welding cracks,making it difficult to be used in the manufacture of structural parts.[Meth-ods]In this paper,3 mm thickness 0Cr21Al6 rolled plate was used as the research object,the laser self-fusion welding and TIG self-fusion welding joint structures and performance were compared,Fe-CrAl stainless steel welded joint brittleness characteristics were analyzed,and the joint brittleness im-provement and control measures were put forward.[Results]The results show that the carbon equiva-lent of the material is up to 4.06,and the cold crack tendency is serious,which is one of the main rea-sons for the transverse crack of the material joint.At the same time,the binding stress in the welding process is also one of the important reasons for aggravating the generation of cracks.It is confirmed that the free welding method supplemented with hammering after welding can be used to reduce the binding stress and avoid the occurrence of welding cracks.Compared with TIG welding joint perfor-mance,the microstructure and brittleness of the joint area are significantly reduced when laser welding with high energy density is used,and the elongation is increased to more than 10%,which is about 40%of that of the base metal.By comparing with the analysis of the microstructure and properties of the joint after ultrasonic shock treatment,it is found that the ultrasonic shock load promotes the recrys-talization transformation of the weld center,further reduces the brittleness of the joint,and increases the joint elongation to 20%.This provides theoretical support for FeCrAl stainless steel electrother-mal function and structure integrated manufacturing.关键词
FeCrAl不锈钢/焊接工艺/拘束应力/晶粒粗化/超声波冲击Key words
FeCrAl stainless steel/welding process/confinement stress/grain coarsening/Ultra-sonic shock分类
矿业与冶金引用本文复制引用
郭子昊,杨密,张婷婷,李欣儒,王文先..0Cr21Al6不锈钢自熔焊接头脆性及调控机理[J].太原理工大学学报,2025,56(4):716-722,7.基金项目
国家自然科学基金资助(52274390,52275360) （52274390,52275360）
