激光表面熔凝处理对共晶铝硅合金疲劳裂纹扩展的影响  

Effect of laser surface melting on fatigue crack propagation of eutectic aluminum silicon alloy

作　　者：王明星[1] 张华顺[1] 刘志勇[1] 刘忠侠[1] 晁明举[1] 翁永刚[1] 宋天福[1] 

机构地区：[1]郑州大学材料物理教育部重点实验室,河南郑州450052

出　　处：《金属热处理》2008年第2期47-50,共4页Heat Treatment of Metals

摘　　要：研究了共晶铝硅合金在激光表面熔凝处理后的显微组织变化及激光表面熔凝处理对合金疲劳裂纹扩展的影响。结果表明,激光表面熔凝处理使试验合金的表层微观组织发生显著变化,熔凝层中的初生α-Al枝晶相和共晶Si相均有明显细化,熔凝层的硬度显著提高;在应力比R为0.1和0.5的试验条件下,激光表面熔凝处理能显著提高共晶铝硅合金的疲劳裂纹扩展抗力。The microstructure and the fatigue crack propagating behaviour of eutectic aluminum-silicon alloy processed by laser surface melting were investigated. The results show that α-A1 phase and eutectic Si phase in laser-melted zone of the alloy are significantly refined, and the hardness of the laser-melted zone is obviously increased. At the testing conditions with stress ratio R of O. 1 and O. 5, laser surface melting treatment can improve the fatigue crack propagating resistance of the eutectic aluminum-silicon alloy.

关 键 词：激光表面熔凝处理 共晶铝硅合金 疲劳裂纹扩展 

分 类 号：TG156.99[金属学及工艺—热处理]