摘要
针对重载油膜轴承衬套巴氏合金与钢基体的结合问题,研究了埋弧焊工艺下不同热输入参数对SnSb8Cu4与20钢结合性能的影响,并与传统离心浇铸工艺进行了对比分析。结果表明:埋弧焊工艺下SnSb8Cu4与20钢实现了良好的冶金结合,焊接后巴氏合金组织细小、均匀、致密且组织无偏析,在2300~17000 J/mm热输入下的结合强度约100 MPa,与离心浇铸相比提升了约80%,与MIG焊相比提升了约25%。埋弧焊工艺下巴氏合金表层硬度约25 HV,而离心浇铸工艺下的巴氏合金表层硬度低于20 HV;埋弧焊试样断裂面发生在巴氏合金层,表现为巴氏合金强度不足所引起的准解理断裂;离心浇铸试样断裂面发生在界面层处,表现为界面结合强度不足导致的剥离脱落。埋弧焊热输入的改变会对SnSb8Cu4与20钢的结合强度、巴氏合金的元素分布、晶粒细化程度、硬度等性能产生影响。
Aiming at the bonding problem between Babbitt alloy and steel matrix of heavy duty oil film bearing bush,the influence of different heat input parameters on the bonding performance between SnSb8Cu4 and 20 steel under submerged arc welding process was studied,and it was compared with the traditional centrifugal casting process.The results show that SnSb8Cu4 and 20 steel achieve good metallurgical bonding under submerged arc welding process.The microstructure of Babbitt alloy after welding is fine,uniform,compact and no segregation.The bonding strength under the heat input of 2300-17000 J/mm is about 100 MPa,which is about 80% higher than that of centrifugal casting and 25%higher than that of MIG welding.The surface hardness of Babbitt alloy by submerged arc welding is about 25HV,while that by centrifugal casting is lower than 20HV.The fracture surface of submerged arc welding specimens occurs in Babbitt layer,which is quasi cleavage fracture due to insufficient Babbitt alloy strength.And the fracture surface of centrifugal casting specimen occurs in interface layer,which is peeling off due to insufficient interfacial bonding strength.The change of heat input of submerged arc welding will affect the bonding strength between SnSb8Cu4 and 20 steel,the element distribution,the degree of grain refinement and hardness of Babbitt alloy.
作者
张帆
刘昱阳
王建梅
王建华
ZHANG Fan;LIU Yuyang;WANG Jianmei;WANG Jianhua(Engineering Research Center of Heavy Machinery Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Gelisen Heavy Transmission Machinery Co.,Ltd.,Taiyuan 030100,China)
出处
《热加工工艺》
北大核心
2023年第17期124-130,共7页
Hot Working Technology
基金
国家自然科学基金项目(51805409,51875382)
山西省高等学校科技创新项目(2020L0357)
博士科研启动基金项目(20202010,20212013)。
作者简介
张帆(1986-)男,陕西铜川人,讲师博士,主要研究方向:摩擦学、轴承及转子系统动力学,电话:13772092386E-mail:zhangfan19860605@126.com。
