含Mg夹杂物对低合金高强度钢CGHAZ韧性的影响  

Effect of inclusions on toughness for low alloy high strength steel CGHAZ

作　　者：吉梅锋 胡锋[1] 张莉芹[1,2] 吴开明[1,2] JI Meifeng;HU Feng;ZHANG Liqin;WU Kaiming(Collaborative Innovation Center for Advanced Steels,International Research Institute for Steel Technology,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;College of Science,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心,国际钢铁研究院,湖北武汉430081 [2]武汉科技大学理学院,湖北武汉430081

出　　处：《钢铁研究学报》2021年第12期1278-1288,共11页Journal of Iron and Steel Research

基　　金：联合基金资助项目(U20A20279);武汉市科技局应用基础前沿专项资助项目(2019010701011382);111项目和武汉科技大学科发院重大科技资助项目(2018TDX07)。

摘　　要：采用Ca、Mg处理工艺研究不同夹杂物粒子对200 kJ/cm大线能量焊接低合金高强度钢CGHAZ冲击韧性的影响,对各个试样CGHAZ的显微组织,晶粒尺寸和冲击功进行观察和分析。试验结果表明,在低合金高强度钢CGHAZ中,Mg处理钢的冲击性能明显高于Ca处理钢,主要原因是含Mg夹杂物粒子析出能力比含Ca夹杂物粒子强,在焊接过程中,含Mg夹杂物粒子对CGHAZ组织的钉扎作用更加显著;同时提高针状铁素体的含量,延长裂纹扩展路径,提高断裂时吸收的能量,使样品韧性得到提升。The influence of different inclusion particles on the impact toughness of low-alloy high-strength steel CGHAZ of 200 kJ/cm high heat input welding low-alloy high-strength steel was studied by Ca and Mg treatment process. The microstructure, grain size and impact energy of each specimen CGHAZ were observed and analyzed. The test results show that in the low-alloy high-strength steel CGHAZ, the impact properties of Mg-treated steel were significantly higher than that of Ca-treated steel. The main reason is that the precipitation ability of Mg inclusion particles is stronger than that of Ca inclusion particles. In the welding course, Mg inclusion particles have more significant pinning effect on CGHAZ microstructure, not only increasing the content of acicular ferrite, extending the crack propagation path, but also increasing the energy absorbed during fracture, and improving the toughness of the specimen.

关 键 词：大线能量焊接 夹杂物 焊接热影响粗晶区 冲击韧性 

分 类 号：TG407[金属学及工艺—焊接] TG142.1[一般工业技术—材料科学与工程]