Development of Stress Improvement Technique Using Pulse Laser Irradiation Evaluation of Stress Improvement for Type 304 Stainless Steel.
Development of Stress Improvement Technique Using Pulse Laser Irradiation Evaluation of Stress Improvement for Type 304 Stainless Steel.
复制标题
使用脉冲激光照射评估 304 不锈钢应力改善的应力改善技术的开发。
DOI：
10.2472/jsms.49.193
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
M. Kanno
中科院分区：
文献类型：
--
作者：
M. Obata;Tatsuya Kubo;Y. Sano;Masaki Yoda;N. Mukai;S. Shima;M. Kanno
已经开发出一种利用脉冲激光照射来改善材料表面残余应力的新技术。当高能脉冲激光照射材料表面时，高压等离子体产生的脉冲波传播到材料内部，从而在材料表面产生高压应力。对 304 型不锈钢的应力改进进行了评估，将其作为预防性维护技术应用于轻水反应堆的反应堆内部。 304 型不锈钢获得了显着的应力改善，压应力层的厚度比传统喷丸技术大得多，并且压应力深度分布几乎与材料强度（冷加工率）无关。研究了光斑直径、脉冲能量和脉冲数密度等加工参数对 304 不锈钢应力改善的影响。金相组织和AES分析也证实，激光照射对材料没有太大的热影响。
A novel technique in which pulse laser irradiation is used to improve residual stress of material surface has been developed. When a material surface is irradiated by a high-energy pulse laser, the impulsive wave, which is generated by the high-pressure plasma, propagate into the material interior, thereby inducing high compressive stress on the material surface. The stress improvement for Type 304 stainless steel was evaluated to apply it to reactor internals in light water reactors as a preventive maintenance technique. Remarkable stress improvement was obtained for Type 304 stainless steel, the thickness of a compressive stress layer was much larger than that in the case of conventional peening techniques, and the compressive stress depth profiles virtually independent of the material strength (cold working rate). The effects of processing parameters, i.e., spot diameter, pulse energy and pulse number density, on the stress improvement of Type 304 stainless steel were investigated. It was also confirmed from metallographical structure and AES analysis that there was not much thermal effects on the material due to the laser irradiation.