| 激光点状合金化对42CrMo钢疲劳裂纹扩展速率的影响 |
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| 引用本文： | 李正阳,钟敏霖,张红军,张伟民,刘文今. 激光点状合金化对42CrMo钢疲劳裂纹扩展速率的影响[J]. 应用激光, 2007, 27(1): 1-4 |
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| 作者姓名： | 李正阳 钟敏霖 张红军 张伟民 刘文今 |
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| 作者单位： | 清华大学,机械工程系,先进成形制造重点实验室,北京,100084 |
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| 摘 要： | 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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| 关 键 词： | 激光 合金化 疲劳裂纹扩展 断口 |
Effect of laser spot alloying 42CrMo steel on the fatigue crack growth rate |
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| Li Zhengyang,Zhong Minlin,Zhang Hongjun,Zhang Weiming,Liu Wenjin. Effect of laser spot alloying 42CrMo steel on the fatigue crack growth rate[J]. Applied Laser, 2007, 27(1): 1-4 |
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| Authors: | Li Zhengyang Zhong Minlin Zhang Hongjun Zhang Weiming Liu Wenjin |
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| Abstract: | To solve the problems of cracking and softening in overlapping passes by laser overlapped scanning surface hardening,a novel method named laser spot alloying was developed.The alloy powder,painted on the base or injected by nozzle,was melt with the base material by laser keyhole effect,then an alloying zone was formed.It is shown that a regular pattern distribution of scattered alloying zones which surrounded by phase transformation zone can retard the fatigue crack growth rate and improve the fatigue life.Fatigue fractographs analysis show that phase transformation zone plays an important role to retard the crack growth. |
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| Keywords: | Laser alloying fatigue crack growth fracture |
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