激光重熔A356铝合金表面的力学性能

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采用不同的激光功率在A356铝合金表面进行激光重熔试验,分析了重熔层的组织和显微硬度,并采用三点弯曲试验研究了重熔层的力学性能以及重熔层与基体的结合性能。结果表明:与基体相比,激光重熔层的硬度得到了大幅提升;重熔层中的细晶强化及第二相弥散强化提高了重熔层的强度,延缓了重熔层中第一裂纹的发生;重熔层与基板区域具良好的冶金结合能力,界面区域无裂缝;经激光重熔处理的试样表现出了良好的表面力学性能,在1500 W及2000 W激光功率下获得的重熔层与基体间未出现分层现象。
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