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材料工程  2000 

铸造铝合金激光表面重熔(LSM)改性层的组织结构

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Keywords: 铸造铝合金,激光表面重熔,显微组织

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Abstract:

采用最大输出功率为10kW的连续横流CO2激光器对铸造铝硅合金表面进行快速辐照加热重熔,并快速冷却凝固处理,以获得深度达1mm以上的表面改性层.通过SEM,XRD,EDS和TEM研究了其表面改性层组织结构.结果表明,经过LSM处理后的表面改性层,组织明显细化,α-Al晶体中可固溶更多的Si原子,获得过饱和固溶体组织.另外,表面改性层的平均显微硬度在116~203HV之间,耐磨性明显高于基体材料,这是由于细晶强化和过饱和固溶效应引起的.

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