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Effect of laser spot alloying 42CrMo steel on the fatigue crack growth rate
Author(s): 
Pages: 1-4
Year: Issue:  1
Journal: APPLIED LASER

Keyword:  激光合金化疲劳裂纹扩展断口;
Abstract: 裂纹倾向严重和搭接区软化是激光表面强化技术面临的两大难题,为此,提出了一种激光点状合金化方法:使预涂在基体表面的合金涂层或由喷嘴送入的合金粉,在激光小孔效应作用下,与基体形成混合熔池,得到合金化点.研究表明,大量规则分布、互不重叠的合金化区及其周围的相变硬化区从总体上降低了疲劳裂纹扩展速率,提高了材料的疲劳寿命.对疲劳裂纹断口的初步分析显示,相变硬化区对阻滞裂纹扩展其到了重要作用.
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