飞机起落架轴颈模拟试样的激光熔覆

Laser cladding of simulating sample used plane landing gear neck

采用三种不同的合金粉末对制造飞机起落架的常用材料３０ＣｒＭｎＳｉＮｉ２Ａ进行了激光熔覆处理。并与对磨的高频淬火试样进行了环与环的接触疲劳磨损试验，用失重法比较了三种粉末激光熔覆后的耐磨性。并且对其中Ｎｉ基试样的熔覆层及过渡层进行了硬度分析、金相组织及性能分析。结果表明：采用激光熔覆工艺能显著提高试样的耐磨性，其中又以含有３０％ＷＣ的Ｎｉ基粉末为最好。

A laser cladding has been processed on the 30CrMnSiNi2A which is often used in mading plane landing gear by using three kinds of alloy powder,and the contact fatigue erosion test is done with the high-frequence queching sample,then the wearing resistance is compared by using the method of weight loss. The microhardness distribution,microstructure and properties of cladding and transition layer of nickel-based alloysample are analysed.The results show:the wearing resistance can be greater improved by laser cladding process,among these three kinds of alloy powder,the wearability of Ni +30% WC is the best.