不同补焊次数下ZG06Cr13Ni4Mo的组织演变规律  

Microstructure Evolution Law of ZG06Cr13Ni4Mo with Different Repair Welding Numbers

作　　者：苏允海[1] 魏祖勇 张桂清[1] 张祥稳 SU Yunhai;WEI Zuyong;ZHANG Guiqing;ZHANG Xiangwen(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《材料导报》2023年第16期193-198,共6页Materials Reports

基　　金：辽宁省服务地方重点项目(LFGD2019001)。

摘　　要：为了明确不同补焊次数下ZG06Gr13Ni4Mo马氏体不锈钢补焊区显微组织的演变规律,采用钨极气体保护电弧焊(Gas tungsten arc wel-ding,GTAW焊)对40 mm厚ZG06Gr13Ni4Mo板进行一次、二次补焊,每次补焊完成后进行600℃下2 h的回火。分别采用OM、SEM、EBSD和TEM检测母材和不同补焊次数下补焊区的显微组织变化,研究补焊区域的组织演变规律。结果表明:补焊区的物相主要由马氏体和少量逆变奥氏体组成,逆变奥氏体以细条状分布在马氏体边界及基体内。补焊区中逆变奥氏体的含量随补焊次数的增加而增多,而且焊缝区逆变奥氏体的含量大于热影响区。此外,补焊区的晶粒有细化的趋势,相对于母材,一次及二次焊缝区的晶粒尺寸细化了45.2%和61.9%,焊缝区的晶粒尺寸比热影响区分别细化了40.8%和48.3%,逆变奥氏体的大小约为马氏体的50.0%。补焊区域织构的取向由铸件的〈101〉转变为各向异性,小角度晶界减少,大角度晶界增多。随补焊次数增加,补焊接头的硬度、抗拉强度逐渐下降,塑性得到改善。In order to clarify the evolution law of microstructure in the repair welding area of ZG06Gr13Ni4Mo martensitic stainless steel under different repair times,GTAW was used to repair 40 mm ZG06Gr13Ni4Mo once and twice,temper at 600℃for 2 hours after each repairing.OM,SEM,EBSD and TEM were used to detect the microstructure changes of the base metal and the repair area under different repair times,and the microstructure evolution law of the repair area was studied.The results show that the phase of the repaired area is mainly composed of martensite and a small amount of reversed austenite,which is distributed in the boundary of martensite and matrix in the form of thin laths.The content of reversed austenite in the repair welding areas increases with the increase of repair welding times,and the content of reversed austenite in the weld zone is greater than that in heat affected zone.In addition,the grain size in the repaired joint tends to refinement.Compared with the base metal,the grain size in the once and twice weld zone is refined by 45.2%and 61.9%,while the grain size in the weld zone is refined by 40.8%and 48.3%respectively compared with that in the heat affected zone,and the size of reversed austenite is about 50%of that of martensite.The orientation of texture changes from〈101〉to anisotropy,the small angle grain boundary decreases and the large angle grain boundary increases.With the increase in the number of repairing welds,the hardness and strength of the repaired joints decrease gradually,and the yield strength and plasticity increase gradually.

关 键 词：补焊 超低碳马氏体不锈钢 逆变奥氏体 背散射电子衍射 

分 类 号：TG455[金属学及工艺—焊接]