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激光冲击次数对TA15微观组织和硬度的影响

DOI: 10.13700/j.bh.1001-5965.2013.0305, PP. 444-448

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Abstract:

采用脉冲能量20J的调Q掺钕玻璃激光对钛合金TA15进行不同次数的激光冲击强化.结果表明,激光冲击强化使材料表面产生微塑性变形,形成致密的微凹坑,导致晶粒细化,并且随冲击次数的增加,其微凹坑的深度增加;但当冲击次数超过2次后,深度便不再增加.所以试验中的最高冲击次数为2次,而且在冲击次数为2次以内,材料位错密度也随冲击次数的增加而增加,并发生塞积、增殖、缠结等现象.表征在硬度方面,由于上述微观组织的变化,材料的硬度提高.随着冲击次数增加,材料的硬度增加并且激光冲击强化的影响层深度也随之增加.

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