真空电子束焊接35CrMnSi钢  

Vacuum electron beam welding of 35CrMnSi steel

作　　者：陈国庆[1] 张秉刚[1] 王振兵[1] 冯吉才[1] 孙毅[2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学航天学院航天工程与力学系,哈尔滨150001

出　　处：《焊接学报》2011年第9期33-36,114-115,共4页Transactions of The China Welding Institution

基　　金：国家重点基础研究发展计划资助项目(973)(2010CB731704);国家自然科学基金资助项目(51075089)

摘　　要：对35CrMnS i钢电子束焊接进行了研究.结果表明,电子束焊接接头成形良好,无焊接缺陷产生.焊缝完全奥氏体化,在随后的快速冷却后形成以板条马氏体为主,并有少量残余奥氏体的组织.热影响区分为过热区、正火区和不完全淬火区,过热区为粗大马氏体组织,正火区为马氏体和贝氏体混合组织,而不完全淬火区为马氏体和铁素体混合组织.接头的抗拉强度高于母材,断裂均发生在母材处,焊缝硬度显著高于母材.接头抗弯强度为1 300 MPa,较母材有所提高,且抗弯强度随束流的增大而略有增加.接头弯曲角为54,°较母材略有降低.The electron beam welding of(35CrMnSi steel) was studied.The results showed the appearance of electron beam welded joint was good,and no welding defects were found.The weld was fully austenitized,the rapidy solidified microstructure mainly consists of batten martensite while a small amount of residual austenite.The heat-affected zone can be divided into the overheated zone,normalized zone and slack quenching zone.The microstructure of overheated zone was coarse martensite.The microstructure of normalized zone was the mixture of martensite and bainite.The tensile strength of joint was higher than the base metal and the fracture occurred at the base metal.The weld hardness was significantly higher than the base metal,the bending strength was 1 300 MPa,which was better than base metal,and the bending strength increased slightly with beam current.The bending angle of joint was 54°,which was slightly lower than the base metal.

关 键 词：35CRMNSI钢 电子束焊接 接头组织 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]