基于轮廓法测量钛合金激光熔覆中的残余应力  

Measurement of residual stress in laser cladding of titanium alloy based on contour method

作　　者：刘军军[1] 姜昊 雷振坤[1] 谢一帆 于申[1] LIU Junjun;JIANG Hao;LEI Zhenkun;XIE Yifan;YU Shen(State Key Laboratory of Structure Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,Liaoning,China;College of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,Heilongjiang,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学工业装备结构分析优化与CAE软件全国重点实验室,辽宁大连116024 [2]东北林业大学机电工程学院,黑龙江哈尔滨150040 [3]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《实验力学》2023年第3期285-295,共11页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(12002078,11972106,11772081)。

摘　　要：由于激光熔覆过程中有温度变化快、局部温度梯度大和伴随固液相快速转化等特性,在熔池和热影响区会产生很大的残余应力和变形,不利于金属增材制造和局部修复的精确可控。本文对Ti-6Al-4V(TC4)合金开展激光熔覆实验,采用轮廓法测量了激光熔覆所产生的残余应力;通过三维热力耦合有限元模型计算了温度场和残余应力场,仿真计算结果与轮廓法测量的残余应力趋势一致。结果表明,残余应力在熔覆位置有最大拉伸应力,随着远离焊缝急剧变成压缩应力并逐渐减小。上述工作有利于研究熔覆过程中的温度分布规律及残余应力的生成机制,可为熔覆过程的工艺控制提供参考。Due to the characteristics of rapid temperature change,large local temperature gradient,and rapid solid-liquid phase transformation in the process of laser cladding,great residual stress,and deformation would be generated in the molten pool and heat affected zone,which is not conducive to the accurate control of metal additive manufacturing and local repair.In this paper,laser cladding experiments were carried out on Ti-6Al-4V(TC4)alloy,and the residual stress produced by laser cladding was measured by the contour method.The temperature field and residual stress field were calculated by a three-dimensional thermal-mechanical coupling finite element model,which was consistent with the trend of residual stress measured by the contour method.The residual stress had the maximum tensile stress at the cladding position,and with the distance away from the weld,it suddenly became compressive stress and gradually decreases.The above work was conducive to the study of the temperature distribution law and the generation mechanism of residual stress in the cladding process,and provided a reference for the process control of the cladding process.

关 键 词：激光熔覆 残余应力 轮廓法 数值模拟 

分 类 号：O348.3[理学—固体力学]