YG8/GH4169异种材料钎焊接头残余应力的数值模拟

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中图分类号：TG454

Numerical simulation of residual stress in YG8/GH4169 dissimilar material brazed joints

QIAO Ruilin'，LONG Weimin'， QIN Jian'²，LIAO Zhiqian³，FAN Xigang4，WEI Yongqiang§ （1.State Key Laboratory of Advanced Brazing Filler Metals&Technology， Zhengzhou Research Institute of Mechanical Engineering Co.，Ltd.， Zhengzhou，450o01，China； 2.University of Science and Technology Beijing，Beijing，100083，China; 3.Luoyang Ship Material Research Institute，Luoyang， 471039，China; 4.Beijing Xinghang Electro-mechanical Equipment Co.， Ltd.， Beijing，100074，China; 5.Zhengzhou University of Aeronautics，Zhengzhou，45OO46，China）

Abstract：Drilling sampling is the preferred method to achieve lunar soil sample collection.To addressthe issue ofhigh residual stress and poor connectionqualityin dissimilar material brazed joints within driling sampling tools，this paper uses ANSYS finite element software as a platform and a numerical simulation method to study the distribution of residual stressin a YG8/GH4169 brazed joint，as well as the influence of adding Cu and Mo interlayers on theresidual stress in the joint.The results indicate that there is a great deal of residual stress in the brazed joint of cemented carbide/superalloy.The dangerous area of stress concentration is the vertex of the cemented carbide near the welding seam，with a maximum axial residual stress of about1 304 MPa.Adding Cu and Mo interlayers can effctively alleviate residual stress in the joint.When the thickness of the interlayers is less than 0.6mm ，Cu has a beter relieving effect on residual stress in the joint. When the thickness of the interlayers is greater than 0.6mm ，Mo has a better relieving effect. When Cu and Mo are used as interlayers， the optimal thickness forrelieving residual stress in the joint is around 1.0mm . The experimental results of residual stress in dissimilar materials brazed joints are basically consistent with the numerical simulation results.

Key words： numerical simulation; residual stress; cemented carbide; superalloy； brazing

0前言

自二十世纪以来，随着地球上资源危机问题的不断加重，各国为争取丰富的地外资源，展开了频繁的探月活动，月球探测工程的主要任务是月球土壤的采样和返回，而钻探采样技术是实现月球土壤样本采集的首选方法[1]。（剩余8342字）