焊速对22MnB5钢激光拼焊接头组织及性能的影响  

Effect of Welding Speed on Microstructure and Properties of Laser Tailor-Welded Joint of 22MnB5 Steel

作　　者：李贤 陈霞[1] 陈彬[2] LI Xian;CHEN Xia;CHEN Bin(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]上海交通大学材料科学与工程学院,上海200240

出　　处：《热加工工艺》2022年第7期26-30,共5页Hot Working Technology

摘　　要：对热浸Al-Si涂层22MnB5钢板进行950℃高温热处理后,再进行不同焊速(70~110 mm/s)的激光拼焊焊接,研究了其焊接接头的组织和力学性能。结果表明:激光拼焊过程中的冷却速度极快,焊接接头熔合区的组织主要为板条状马氏体、贝氏体以及Al-Si涂层熔融进入熔合区形成的Fe_(3)(Al,Si)相。随焊速从70 mm/s增加到100 mm/s,激光拼焊过程中热输入量降低,冷却速度加快,马氏体组织细化,同时熔合区Al含量降低,Fe_(3)(Al,Si)相减少,焊接接头的硬度、抗拉强度以及伸长率总体上都增大;当焊速为110 mm/s时,由于未完全焊透,焊接接头处出现细微裂纹缺陷,从而降低了其力学性能。The hot-dip Al-Si coated 22MnB5 steel plate was welded by laser welding at different welding speeds(70-110 mm/s) after 950 ℃ high temperature heat treatment, and the microstructure and mechanical properties of the welded joints were studied. The results show that since the cooling speed of laser welding is very fast, the microstructure of the weld fusion zone is mainly consist of lathy martensite, bainite and Fe_(3)(Al,Si) phase formed by the Al-Si coating melting into the fusion zone. With the increase of welding speed in 70-100 mm/s, the heat input decreases, the cooling speed increases, the martensite is refined, the content of Al in fusion zone decreases, the Fe3(Al,Si) phase decreases, and the hardness, tensile strength and elongation of the welded joint increase generally. When the welding speed is 110 mm/s,the welded joint has micro crack defects due to incomplete penetration and its mechanical properties are reduced.

关 键 词：激光拼焊 AL-SI涂层 22MnB5钢 

分 类 号：TG456.7[金属学及工艺—焊接]