大焊接热循环条件下Nb含量对Mg处理钢CGHAZ组织和性能的影响  

Effect of Nb on Microstructure and Property of CGHAZ of Mg-treated Steel at Large Welding Thermal Cycle Conditions

作　　者：张亚运 张宇 王纳 郭慧英 ZHANG Yayun;ZHANG Yu;WANG Na;GUO Huiying(Institute of Research of Iron and Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《热加工工艺》2022年第1期111-113,119,共4页Hot Working Technology

摘　　要：利用热模拟试验机、扫描电镜、冲击试验等设备和方法研究了不同Nb含量对Mg处理钢热影响区组织和性能的影响。结果表明:在300 kJ/cm焊接热输入量下,随Nb含量增加,粗晶热影响区的原奥氏体晶粒尺寸减小,晶界铁素体和块状M/A组元比例增加;粗晶热影响区的-40℃冲击功值下降,但硬度值逐渐增加。The effect of Nb on the microstructure and property of simulated coarse-grained heat affected zone(CGHAZ)of Mg-treated steel was analyzed by thermal simulation tester,scanning electron microscope,impact toughness test.The results show that under the welding heat input of 300 kJ/cm,with the Nb content increasing,the orginal austenite grain size of CGHAZ decreases,and the fraction of grain boundary ferrite and blocky M/A constituents increases;the impact toughness of the CGHAZ decreases,while the hardness increases.

关 键 词：Mg处理钢 Nb微合金元素 粗晶热影响区 强韧性 

分 类 号：TG406[金属学及工艺—焊接]