光学学报, 2016, 36 (8): 0814003, 网络出版: 2016-08-18
激光冲击强化对AM50镁合金性能和结构的影响 下载: 534次
Effect of Laser Shock Processing on Property and Microstructure of AM50 Magnesium Alloy
激光技术 激光冲击强化 AM50镁合金 显微硬度 残余应力 晶粒分布 laser technique laser shock processing AM50 magnesium alloy micro-hardness residual stress grain distribution
摘要
采用激光冲击强化(LSP)处理方法研究了激光冲击强化对AM50铸造镁合金深度方向的晶粒结构、显微硬度和残余应力的影响。结果表明,经过单次冲击强化后, 合金表层的显微硬度值、残余压应力值均有明显改善;在冲击强化层,原始粗晶明显细化,表层显微硬度值提高了19%,残余压应力达到-225 MPa,且显微硬度提高区、晶粒细化层及残余压应力层的深度明显增大;当冲击次数增加到2次时,显微硬度、晶粒尺寸和残余应力得到进一步改善。
Abstract
The method of laser shock processing (LSP) is used to investigate the effect of LSP on the grain structure, micro-hardness, and residual stress of the AM50 magnesium cast alloy along its depth direction. Results indicate that the micro-hardness and residual compressive stress of the alloy surface both have significant improvement after single LSP. On the LSP layer where original coarse grains are refined obviously, the surface micro-hardness value is increased by 19%, and the residual compressive stress is up to -225 MPa. Besides, the depths of the micro-hardness-improved area, grain-refined layer, and residual compressive stress layer are obviously increased. When the impact times is increased to two, the micro-hardness, grain size, and residual compressive stress are further improved.
刘波, 罗开玉, 吴刘军, 鲁金忠. 激光冲击强化对AM50镁合金性能和结构的影响[J]. 光学学报, 2016, 36(8): 0814003. Liu Bo, Luo Kaiyu, Wu Liujun, Lu Jinzhong. Effect of Laser Shock Processing on Property and Microstructure of AM50 Magnesium Alloy[J]. Acta Optica Sinica, 2016, 36(8): 0814003.