37CrMnMo钢管径向摩擦焊接头组织与性能  

Microstructure and properties of radial friction welded joint of 37CrMnMo steel pipe

作　　者：秦国梁[1] 张春波[2] 周军[2] 齐秀滨[2] 张焱[2] 

机构地区：[1]山东大学现代焊接技术研究所,济南250061 [2]机械科学研究院哈尔滨焊接研究所,哈尔滨150080

出　　处：《焊接学报》2012年第1期21-24,114,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51075174)

摘　　要：在优化焊接工艺参数下实现了45钢径向环与37CrMnMo钢管的径向摩擦焊接.试验结果表明,径向环发生了强烈地塑性变形,焊缝表面有明显的氧化色,管体上具有很窄的热影响区.焊缝抗剪强度平均达401 MPa,略高于径向环母材.硬度从焊缝结合界面向两侧的径向环和管体母材逐渐降低.焊缝剪切断口平滑,呈现明显的剪切韧窝断裂特征,表明焊缝具有较好的塑韧性.接头金相组织分析结果表明,焊缝具有很窄的结合面,45钢径向环和37CrMnMo钢管体侧热影响区组织分别为铁素体+珠光体+贝氏体和贝氏体+少量马氏体,相比较母材产生了少量的马氏体组织,但焊缝中心及热影区的组织得到了细化.With self-developed radial friction welding machine,37CrMnMo steel pipe was welded at the optimized welding parameters by taking 45 steel as ring.Experimental results show that the ring has serious plastic deformation and there is a narrow HAZ in 37CrMnMo steel pipe body and the weld is oxidized.The mean shear strength of the weld can be up to 401 MPa,which is higher than that of 45 steel.The appearance of shear fracture is smooth and characterized by shear dimple,which indicates that the weld has high ductile and plastic properties.The microhardness is decreased from the bonding center to both sided of 45 steel ring and 37CrMnMo steel pipe.The analyses on microstructure of the joint show that there is a very good narrow metallurgical bonding zone between steel ring and steel pipe,but overheated zones appears in HAZ of 45 steel pipe and 20 steel ring.The HAZ in 45 steel side is ferrite,pearlite and bainite,and that in 37CrMnMo steel side is bainite and a few martensite.Compared with base metal,hardening microstructure appears in HAZs of 45 steel and 37CrMnMo steel because of high cooling rate,but the microstructure in the weld is finer than that of base metal under the thermo-mechanical coupling interaction.

关 键 词：径向摩擦焊 钢管 接头 组织 性能 

分 类 号：TG457.6[金属学及工艺—焊接]