搭接率对CK45钢激光熔凝硬度及应力分布的影响  

Influence of overlapping ratio on hardness and stress distributions of CK45 steel by laser remelting

作　　者：李同道[1] 韩涛[1] 占焕校[1] 王勇[1] 

机构地区：[1]中国石油大学机电工程学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2007年第6期152-155,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：山东省自然科学基金项目(Y2006F64);中国石油大学(华东)博士基金项目(Y050322)

摘　　要：采用大型有限元仿真软件SYSWELD,利用自建的宽带热源模型,对CK45钢表面激光熔凝处理过程进行了不同搭接率下的二维数值分析计算,考察了不同搭接率对材料熔凝区的硬度场、应力场等的影响。模拟计算结果表明,自建的宽带热源模型符合宽带热源的热流密度分布规律,模拟出的熔池形状与实际试样十分接近。经过激光熔凝后,材料的硬度得到了显著的提升,单道熔凝的最大硬度出现在熔凝区与母材的交界处。当相邻熔凝带热源中心距离较小时,熔凝区硬度分布比较均匀(除两端外);当相邻熔凝带热源中心距离较大时,硬度分布不均匀。M ises等效应力最大值出现在相邻熔凝带的搭接区,此处是熔凝裂纹形成的主要部位。In order to study the influence of overlapping ratio on the hardness and the stress status of CK45 steel after laser melting process, SYSWELD was used to simulate the 2-D model with the broad-band volumetric heat source model. The calculated widths and depths of laser melting areas with the broad-band volumetric heat source model are in good accordance with the experimental results. The hardness of the melting zone increases obviously and the maximum hardness is in the heat affected zone（HAZ）. The hardness distribution is more homogeneous with small distance between the centers of the adjacent laser melting beam than that with the large one. The maximum Mises stress is at the overlapping zone which is the place dangerous for crack initiation.

关 键 词：搭接率 数值模拟 硬度 应力 有限元法 

分 类 号：TP39[自动化与计算机技术—计算机应用技术] TG156.99[自动化与计算机技术—计算机科学与技术]