采用光学显微镜、电子探针、三点弯曲试验和冷喷涂单边涂层弹性模量理论模型等方法,研究了真空热处理对冷喷涂304不锈钢涂层弹性模量的影响。结果表明：在热处理过程中,304不锈钢涂层内部的金属原子发生扩散、局部粒子界面发生融合,使粒子间结合力和涂层力学性能得以改善;同时涂层中的氧元素也发生扩散形成团聚体,分布于粒子边界处,使得涂层的弹性模量降低。热处理温度低于500℃时,304不锈钢涂层的弹性模量和等效抗弯刚度变化不大,与冷喷态涂层相当;当热处理温度超过500℃后,304不锈钢涂层的弹性模量和等效抗弯刚度随着热处理温度的升高迅速降低;在热处理温度相同的情况下,304不锈钢涂层的弹性模量和等效抗弯刚度随着热处理时间的增加而降低。
Effect of vacuum heat treatment on elastic modulus of 304 stainless steel coating by cold gas spraying was investigated by OM,EPMA,three-point bend test and a theoretical model.The results show that metal atom diffusion occurred at the particles interface in the coating after the heat treatment,and thus the bonding strength between particles and mechanical properties of the coating were improved.However,the oxygen diffusion occurred in the coating to conglomerate at particle interface decreasing the elastic modulus and equivalent flexural rigidity of the coating.It is suggested that elastic modulus and equivalent flexural rigidity of the coating annealed at the temperature below 500 ℃ are close to that of the as-sprayed coating,however,when heat treatment temperature is higher than 500 ℃,both of them decrease rapidly with increasing heat treatment temperature,and also decrease with increasing heat treatment time at the same heat treatment temperature.
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