一次峰值温度对激光电弧复合焊热模拟临界再热粗晶区组织与韧性的影响  

Effect of First Peak Temperature on Microstructure and Toughness of Laser⁃arc Hybrid Welding Simulated ICCGHAZ

作　　者：鲍亮亮 徐艳红 张新明 欧阳凯 BAO Liangliang;XU Yanhong;ZHANG Xinming;OUYANG Kai(China Construction Industrial&Energy Engineering Group Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]中建安装集团有限公司,南京210000

出　　处：《材料导报》2023年第S02期375-379,共5页Materials Reports

基　　金：中建股份科技研发课题(CSCEC-2022-Q-42)。

摘　　要：临界再热粗晶区(Intercritically reheated coarse grained heat affect zone, ICCGHAZ)是低合金高强钢焊接热影响区的局部脆化区,为研究一次峰值温度对低合金高强钢激光电弧复合焊ICCGHAZ微观组织和韧性的影响,本工作利用焊接热模拟技术制备了不同一次峰值温度的ICCGHAZ试样,并对其组织和韧性进行了表征与分析。结果表明:不同一次峰值温度下,热模拟ICCGHAZ的基体组织均为板条马氏体,块状马奥(Martensite-austenite, M-A)组元分布在原奥氏体晶界并在局部聚集成链状。随着一次峰值温度的升高,热模拟ICCGHAZ试样平均晶粒尺寸不断增加,M-A组元体积分数也不断增加,但M-A组元平均晶粒尺寸变化不大。热模拟ICCGHAZ试样裂纹扩展功随一次峰值温度的升高而不断下降,裂纹形成功变化不大。Intercritically reheated coarse grained heat affected zone(ICCGHAZ)is the local brittle zone of high⁃strength low alloy(HSLA)steels welding heat affected zone(HAZ).In order to investigate the effect of first peak temperature on the microstructure and toughness of lase⁃rarc hybrid welding ICCGHAZ of HSLA steels,ICCGHAZ specimens under different first peak temperature were prepared by welding simulation technology.And the microstructure and toughness of the simulated specimens were investigated and discussed.The results showed that the simulated ICCGHAZ specimens were composed of lath martensite with the massive martensite⁃austenite(M⁃A)constituents distributed at the grain boundaries.With the increase of first peak temperature,the average grain size of the simulated ICCGHAZ specimens increased,together with the volume fraction of M⁃A constituents,but the average gran size of M⁃A constituents barely changed.And with the increase of first peak temperature,the crack propagation energy decreased continuously,the crack initiation energy almost unchanged.

关 键 词：一次峰值温度 低合金高强钢 激光电弧复合焊 临界再热粗晶区 微观组织 韧性 

分 类 号：TG404[金属学及工艺—焊接]