Abstract A comprehensive study was undertaken to determine the effects of carrier gas temperature, pressure, and nozzle speed on the residual stresses induced by cold spray coating of aluminum 7075 powder onto AZ31B-H24 magnesium substrate. Embedded Fiber Bragg Grating sensors and thermocouples were employed for simultaneous in-situ measurements of strain and temperature during cold spray process. A statistical model was then developed based on the significance and interactions of the cold spray parameters on the residual stress field. This model demonstrated that the induced temperature is the most significant parameter to the final formation of residual stress. It is also shown that the peening effect plus the temperature resulted from the cold spray yields to the dynamic recrystallization of the substrate near the surface, and generates nano-size grains at the interface. This research validates that the final size of the refined grains and the level of induced residual stress depend heavily on the process' thermal energy.

中文翻译：

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冷喷涂过程中基体残余应力演化的参数研究

摘要 为了确定载气温度、压力和喷嘴速度对 7075 铝粉末冷喷涂到 AZ31B-H24 镁基体上引起的残余应力的影响，进行了一项综合研究。嵌入式光纤布拉格光栅传感器和热电偶用于在冷喷涂过程中同时现场测量应变和温度。然后基于冷喷涂参数对残余应力场的显着性和相互作用开发了统计模型。该模型表明，诱导温度是最终形成残余应力的最重要参数。还表明，喷丸效应加上冷喷涂产生的温度导致了基体表面附近的动态再结晶，并在界面处产生纳米尺寸的晶粒。该研究证实，细化晶粒的最终尺寸和诱发残余应力的水平在很大程度上取决于该过程的热能。