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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
投稿时间:2022-05-18  修订日期:2022-07-11
DOI:
中文关键词:  激光熔覆  残余应力  轮廓法  数值模拟
英文关键词:Laser cladding  Residual stress  Contour method  Numerical simulation
基金项目:国家自然科学基金(12002078, 11972106, 11772081)
作者单位邮编
刘军军 大连理工大学工程力学系 116024
姜昊 大连理工大学工程力学系 116024
雷振坤 大连理工大学工程力学系 116024
谢一帆 大连理工大学工程力学系 116024
于申 大连理工大学工程力学系 116024
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中文摘要:
      由于激光熔覆过程中的温度变化快、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,与轮廓法测量的残余应力趋势一致。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,为熔覆过程的工艺控制提供参考。
英文摘要:
      Due to the characteristics of rapid temperature change, large local temperature gradient and rapid transformation of solid-liquid phase in the process of laser cladding, great residual stress and deformation will be generated in the molten pool and heat affected zone, which was not conducive to the accurate control of metal additive manufacturing and local repair. In this study, the laser cladding experiment of Ti-6Al-4V alloy was carried out, and the residual stress produced by laser cladding was measured by contour method. The temperature field and residual stress field were calculated by thermal-mechanical coupling three-dimensional finite element model, which was consistent with the trend of residual stress measured by contour method. The experimental and numerical results show that the residual stress is the maximum tensile stress at the cladding position, and changes sharply into compressive stress and decreases gradually with the distance from the weld. It is useful to study the temperature distribution and the generation mechanism of residual stress, and provide a reference for the process control of the laser cladding process.
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