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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。
The effects of vacuum heat treatment on the elastic modulus of cold-sprayed 304 stainless steel coating were studied by optical microscopy, electron probe, three-point bending test and cold spray unilateral coating elastic modulus theoretical model. The results show that during the heat treatment, the metal atoms in the 304 stainless steel coating diffuse and the local particle interface fusions, so that the interparticle bonding force and the mechanical properties of the coating can be improved. At the same time, the oxygen in the coating also diffuses to form agglomerates Body, distributed at the particle boundaries, making the coating elastic modulus decreased. When the heat treatment temperature is lower than 500 ℃, the elastic modulus and equivalent bending rigidity of 304 stainless steel coating change little, which is equivalent to that of cold spray coating. When the heat treatment temperature exceeds 500 ℃, the elastic modulus of 304 stainless steel coating And the equivalent flexural rigidity decreases rapidly with the increase of heat treatment temperature. When the heat treatment temperature is the same, the elastic modulus and equivalent bending stiffness of 304 stainless steel coating decrease with the increase of heat treatment time.