不同预热温度下宽带激光熔覆铁基涂层数值模拟  

Numerical Simulation Iron-based Cladding Coating with Wide-band Laser at Different Preheating Temperatures

作　　者：蔡春波[1] 李美艳[1] 韩彬[1] 王勇[1] 李锦 

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580

出　　处：《应用激光》2017年第1期66-71,共6页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:51179202);山东省自然科学基金资助项目(项目编号:ZR2014EEQ037);863计划资助项目(项目编号:2012AA09A203);中央高校基本科研业务费专项资金资助项目(项目编号:15CX05020A)

摘　　要：利用有限元分析软件SYSWELD建立了三维有限元模型,对不同预热温度下激光熔覆铁基涂层的过程进行了数值模拟,分析了不同预热温度下温度场和组织转变的变化规律,研究了冷却速度和组织转变对残余应力场的影响。结果表明,预热温度越高,熔覆层中心的峰值温度越高,同时能有效降低熔覆层冷却速度。预热温度在20~300℃范围内时,随着预热温度的增加,熔覆层贝氏体含量逐渐增加,铁素体和马氏体含量逐渐减少,使得熔覆层残余应力增大;预热温度高于300℃以后,随预热温度增加冷却速度显著降低,组织中铁素体含量逐渐增加,贝氏体含量逐渐减少,残余应力随之减小。In this paper, a 3-D finite element model was established by means of a finite element code--SYSWELD. The laser cladding process of iron-based coatings was simulated and the change rules of temperature field and microstructural transformation were analyzed both under different preheating temperatures. The effects of cooling rate and microstructural transformation on residual stress field are also studied. The results show that the higher the preheating temperature is, the higher the peak temperature of the cladding center is, which will reduce the cooling rate. When the preheating temperature is at the range of 20 ℃ to 300 ℃, with the increasing of it, the content of bainite in cladding layer increases and the content of ferrite and martensite decreases gradually which result in the increase of residual stress. However, when the preheating temperature is above 300 ℃, with the increasing of it, the cooling rate decreases sharply, the content of ferrite in cladding layer increases and the bainite decreases, which bring out the decrease of the residual stress gradually.

关 键 词：激光熔覆 数值模拟 组织转变 温度场 残余应力 

分 类 号：TG178[金属学及工艺—金属表面处理]