铁素体不锈钢焊接热影响区的组织与冲击韧性研究  

Microstructure and Impact Toughness of Welding HAZ in Ferritic Stainless Steel

作　　者：张彦睿[1,2] 柳阳 ZHANG Yanrui;LIU Yang(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron&Steel(Group)Co.,Ltd.,Taiyuan 030003,China;Technology Center,Shanxi Taiyuan Stainless Steel Co.,Ltd.,Taiyuan 030003,China)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003 [2]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《热加工工艺》2023年第1期144-146,共3页Hot Working Technology

基　　金：山西省自然科学基金项目(201801D121076);中国科协青年人才托举工程项目(2018QNRC001);山西省重点研发计划项目(201903D121092)。

摘　　要：分别采用SMAW和MIG焊方法焊接SUS444铁素体不锈钢,对比了焊接HAZ的金相组织、冲击韧性,并对断口进行了SEM形貌和能谱分析。结果表明,虽然使用小直径焊条和小焊接参数,但SMAW焊接HAZ的晶粒仍发生明显长大,其5 mm厚冲击试样的室温冲击功在10 J以下。MIG焊接采用了高速自动焊接,热输入更小,焊接HAZ晶粒未发生明显长大,其5 mm厚冲击试样的室温冲击功达到40 J以上,0℃冲击功达到10 J以上。SUS444 ferritic stainless steel was welded by SMAW and MIG welding respecitively. The microstructure and impact toughness of the welded HAZ were compared, and the SEM morphology and energy spectrum analysis of the fracture was carried out. The results show that although small diameter electrode and small welding parameters are used, the grain size of SMAW welding HAZ grows obviously, the room temperature impact energy of 5 mm thick impact samples is lower than 10J. MIG welding adopts high speed automatic welding, and the heat input is smaller, the grain of welding HAZ doesn’t grow significantly, the impact energy of 5 mm thick impact samples reaches more than 40 J at room temperature and more than 10 J at 0℃.

关 键 词：铁素体不锈钢 热影响区 冲击韧性 

分 类 号：TG457.11[金属学及工艺—焊接] TG444