基于数值模拟的铸钢基体表面堆焊模具组织与性能研究  

Research on Mold Microstructure and Properties of Welding on Casting-steel Based on Numerical Simulation

作　　者：卢顺[1] 周杰[1] 李梦瑶[1] 余盈燕[1] 丁永峰[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《热加工工艺》2013年第19期19-20,25,共3页Hot Working Technology

基　　金：国家自然科学基金面上项目(51275543);中国科技部重大专项项目(2012ZX04010-081)

摘　　要：采用焊接有限元数值分析软件,建立了基于铸钢基体模具的焊接有限元简化模型,采用双椭球热源模型,模拟表面堆焊过程,并分析焊接温度场、应力场和组织变化。结果表明,温度场的实际测量值与计算值相吻合,说明了焊接模拟的正确性和有效性,也为下一步组织变化及应力场的计算提供了相应保证。并得到了铸钢基体模具表面堆焊过程温度、组织及焊接应力之间的变化规律,为进一步研究和优化制造工艺提供了可靠的依据。最后将堆焊试样经高温回火热处理消除残余应力,其组织由回火索氏体、针状下贝氏体和少量的碳化物组成,具有优异的力学性能、冲击韧性和耐磨性,可用于模具锻造生产应用。With double ellipsoid heat source model, the casting-steel welding process was simulated based on simplified finite element model of casting-steel substrate die by welding finite element analysis sol, rare, and the welding temperature field, stress field and microstructure change was analyzed. The simulating results show that the actual measured values of temperature field coincided with the calculated values, which can provide the correctness and validity of the welding simulation. And the guarantee for the next simulation was also provided. The change rules gotten form the welding simulation between temperature, microstructure and welding stress can provide a reliable basis for fimher study and optimization of manufacturing process. Finally, after high temperature tempering heat treatment, the chemical composition of the welding sample was tempered sorbite, acicular lower bainite and a small amount of carbide. The sample has excellent mechanical properties, impact toughness and wear resistance, which can be used to forging die production application.

关 键 词：铸钢基体 堆焊 组织 数值模拟 

分 类 号：TG47[金属学及工艺—焊接] TG455