摘要
在超音速火焰喷涂中,碳化钨颗粒撞击时的状态会对撞击后4340M超高强钢基体的残余应力产生影响,进而影响基体疲劳性能。为了研究颗粒速度、温度会对撞击后基体残余应力的影响,采用SprayWatch喷涂监控设备对粒子的飞行状态进行测量,并用有限元方法对基体残余应力进行计算。试验结果表明:喷涂过程中喷涂参数、喷涂距离、粉末类型等影响颗粒飞行的速度和温度,枪管尺寸对碳化钨颗粒撞击速度的影响最大,粉末类型对碳化钨颗粒撞击温度的影响最大。有限元分析结果表明:粒子的类型决定粒子的密度,粒子密度越高,基体的残余应力越大,粒子类型相同时,撞击温度一定的情况下,撞击速度越快,残余应力越大。有限元计算结果与Almen试片测量的结果相一致。
In high-velocity oxygen-fuel spraying,the impact state of WC particles on the residual stress of 4340 M ultra-high strength steel matrix after impact affects the fatigue performance of the matrix.In order to study the effect of particle velocity and temperature on the residual stress of matrix after impact,the flight status of particles was measured using Spray Watch spray monitoring device,and the residual stress of matrix was calculated using finite element method.The test results showed that the spraying parameters,spraying distance and powder type affected the speed and temperature of particle flight during the spraying process.The impact speed of tungsten carbide particles was most affected by the size of the barrel,and the impact temperature of tungsten carbide particles was most affected by the type of powder.The results of finite element analysis showed that the type of particle determines the density of the particle,and the higher the density of the particle,the greater the residual stress obtained by the matrix.With the same particle type,the faster the impact speed,the greater the residual stress at a certain impact temperature.The results of the finite element calculation were consistent with those of the Almen test.
作者
刘子剑
余鋆
贾治豪
裴祥忠
丁坤英
LIU Zijian;YU Yun;JIA Zhihao;PEI Xiangzhong;DING Kunying(Tianjin Key Laboratory for Airworthiness and Maintenance of Civil Aircraft,Civil Aviation University of China,Tianjin 300300,China;Beijing Aireraft Maintenance Engineering Co.,Ltd.,Beijing 100621,China)
出处
《焊接技术》
2022年第12期27-31,I0008,共6页
Welding Technology
关键词
超音速火焰喷涂
碳化钨
超高强钢
有限元分析
残余应力
high-velocity oxygen-fuel spraying
WC
ultra-high strength steel
finite element analysis
residual stress
