Residual stress improvement of weldment by laser peening
Residual stress improvement of weldment by laser peening
复制标题
激光喷丸改善焊件残余应力
DOI：
10.1533/wint.2006.3624
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发表时间：
2006
影响因子：
--
通讯作者：
T. Yamamoto
中科院分区：
文献类型：
--
作者：
Y. Sano;M. Obata;T. Yamamoto
激光喷丸是一种利用短脉冲激光照射水下材料时产生的高压等离子体与材料表面的机械相互作用进行表面处理的技术。单次(1脉冲)激光喷丸的能量比喷丸的能量大得多。因此，残余应力的改进效果延伸到1毫米深，这项技术被用作核电站中对可靠性要求很高的应力腐蚀开裂的预防措施，并被用作飞机部件的高周疲劳对策。此外，激光喷丸有助于控制各种条件，如适合于材料、结构和区域的脉冲能量，并具有其他特点；例如，不需要进行前处理，如抛光，不与材料接触，没有反作用力。本文阐述了激光喷丸的原理，报道了堆焊区和焊接接头采用激光喷丸后残余应力的改善效果。此外，还给出了应力腐蚀开裂试验结果。
Laser peening is a surface treatment technique which makes use of the mechanically reciprocal action of the material surface and the high-pressure plasma which occurs when a short-pulsed laser is irradiated on material under water. The energy from a single shot (1 pulse) of laser peening is very much greater than that of shot peening. Consequently the improved efficacy of the residual stress extends to as much as a depth of 1 mm and this technique is employed as a preventative measure against stress corrosion cracking in nuclear power stations where high reliability is required and as a high cycle fatigue countermeasure for aeroplane components. Furthermore, laser peening facilitates the control of various conditions such as pulse energy appropriate to the material, configuration and region and has other characteristics; examples are the lack of necessity of pre-treatment such as polishing, no contact with the material and no reaction force. The principles of laser peening are described in this paper and the improving effects of residual stress when laser peening is employed for build-up weld zones and welded joints are reported. Furthermore, the stress corrosion cracking test results are shown.