消除2A12激光熔覆气孔缺陷工艺  

Elimination of gas holes of laser cladding on 2A12 aluminum alloys

作　　者：孙福娟[1] 

机构地区：[1]海军航空工程学院青岛分院,山东青岛266041

出　　处：《焊接学报》2009年第5期93-96,共4页Transactions of The China Welding Institution

摘　　要：对两组2A12铝合金试样模拟腐蚀损伤表面激光熔覆Al-Y(6%Y)合金,一组只做激光熔覆,另外一组每一层熔覆后进行力学冲击.时效后进行疲劳试验、疲劳断口分析及成分测试.结果表明,力学冲击试样熔覆层内基本没有气孔缺陷,熔覆层和基体结合得非常紧密,安全寿命达到了不冲击试样安全寿命的871%.只熔覆不冲击试样熔覆层内有大量的气孔存在,从而大大降低了其安全寿命.相当一部分2A12基材参与了冶金过程,熔覆层Y元素烧损较多.Laser cladding Al-Y(6%Y) was used to repair corrosion damage of 2A12 aluminum alloys.One group of the specimens was shocked on every deposited layer,the other was only deposited Al-Y(6%Y).After aging and fatigue test,fracture and element test were studied.The results show that the safety life of the shocked specimen is 871% of the specimens without shock and there was no pore in the deposited layer which is joined firmly with the substrate.There were many pores in the deposited layer of the specimens without shock,which lead to reduction of the safety life.The element test indicates that parts of the substrate is engaged in metallurgical procedure and the element Y is seriously burnt.

关 键 词：铝合金 激光熔覆 疲劳寿命 疲劳断口 

分 类 号：TG146.2[一般工业技术—材料科学与工程]