焊丝成分对22MnB5热成形钢激光填丝焊接接头组织和性能的影响

Effect of Filler Wire Composition on Microstructure and Properties of Welded Joint of 22MnB5 Hot Formed Steel in Laser Welding

使用成分不同的焊丝对22MnB5热成形钢进行激光填丝焊接,利用光学显微镜、拉伸试验机、JMatPro软件研究Ni含量对焊接接头组织性能及相变温度的影响。结果显示,低Ni含量焊丝焊后经热处理,焊接接头焊缝区组织为马氏体和δ-铁素体的混合组织,接头抗拉强度为1357 MPa;高Ni含量焊丝焊后经热处理,焊接接头焊缝组织为全马氏体组织,接头强度为1516 MPa,接头强度系数达到92%。相较于低Ni焊丝,高Ni焊丝凝固过程中δ-铁素体的形成难度更大,形成全γ-奥氏体的速度也更快。

The study explores the impact of varying Ni composition on the microstructure and phase change temperature of 22MnB5 hot-formed steel jointed through laser welding.Employing optical microscopy,tensile testing machines,and JMatPro software,it examines the weld joints created with filler wires of differing Ni content.The results showed that post heat treat-ment,the joints formed with low-Ni steel wire comprise a mix of martensite and delta-ferrite,attaining a tensile strength of 1357 MPa.Conversely,those created with high-Ni wire yield a fully martensitic microstructure following heat treatment,reac-hing a joint strength of 1516 MPa-equivalent to 92%strength coefficient.Notably,a higher Ni concentration in welding wire complicates the formation of-ferrite during solidification;however,it accelerates the generation rate of-austenite.