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采用激光冲击强化技术对原始组织为层片状珠光体的高碳钢进行表面强化处理,借助扫描电镜(SEM)、透射电镜(TEM)和显微硬度计等手段研究了激光冲击次数对高碳珠光体钢微观组织和硬度的变化规律。结果表明,原始珠光体组织经激光冲击后,渗碳体片层发生弯曲、断裂、球化,并且随着冲击次数的增加,冲击中心区域渗碳体球化程度加剧,溶解量也随之增加,过饱和的碳原子溶于铁素体基体中,导致其点阵常数增大。多次冲击后冲击中心区域材料表层的硬度从300HV(原始珠光体组织)分别增加至333HV(2次激光冲击),353HV(6次)。
High-carbon steel with lamellar pearlite as the original structure was treated with laser shock-enhanced technology. The effects of laser shock frequency on the surface of high-carbon Variation of Microstructure and Hardness of Pearlite Steel. The results show that the original pearlite structure is bent, ruptured and spheroidized after laser shock, and with the increase of the number of impact, the degree of infiltration of cementite in the central region of impact increases and the dissolved amount also increases , Supersaturated carbon atoms dissolved in the ferrite matrix, resulting in its lattice constant increases. After repeated impact, the hardness of the material surface in the impact center region increased from 300HV (original pearlite) to 333HV (2 laser shocks) and 353HV (6 times) respectively.