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为了研究激光冲击强化对镁合金性能的影响,根据优化后的工艺参数,采用钕玻璃脉冲激光,对轧制态AZ31B镁合金薄板试样表面进行冲击强化实验。实验结果表明,晶粒得到明显细化,晶粒大小由20μm左右细化到10μm左右,试样表面激光诱导的残余压应力高达-126 MPa。室温下通过三点加载的方法,对激光冲击、局部区域激光冲击以及未激光冲击的试样在去离子水中进行了应力腐蚀试验,对其断口进行了宏观和微观分析,表明激光冲击能够抑制应力腐蚀裂纹的产生和扩展。
In order to study the impact of laser shock on the properties of magnesium alloy, according to the optimized process parameters, the impact strengthening experiment was carried out on the surface of the as-rolled AZ31B magnesium alloy sheet samples by neodymium glass pulsed laser. The experimental results show that the grains are obviously refined, the grain size is refined from about 20μm to about 10μm, and the laser-induced residual compressive stress on the specimen surface is as high as -126 MPa. At room temperature, stress corrosion tests were carried out on laser shock, local laser shock and non-laser shock in deionized water by three-point loading method. The macroscopic and microscopic analyzes of the fractures showed that the laser shock could suppress the stress Corrosion Crack generation and expansion.