铝对钛合金表面激光熔覆层组织和耐磨性能的影响  

Effect of Al on Microstructure and Wear-Resisting Property of Titanium Alloy Surface Laser Cladding

作　　者：崔爱永[1] 胡芳友[1] 赵培仲[1] 卢长亮[1] 胡滨[1] 付鹏飞[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：《应用激光》2011年第4期313-316,共4页Applied Laser

摘　　要：为探讨铝元素在激光微熔池中真正能实现的作用,借助Nd:YAG激光在TC4表面分别进行了Ti+w(A1)=(1%～8%)激光熔覆实验。观测了微观组织、显微硬度和摩擦磨损性能随铝含量变化规律,分析了生成相,并定量分析生成有序化α_2相(Ti_3Al为基)时的铝含量。结果表明,微观组织由粗大的或不完整的树枝晶、相对较为细小的等轴或近似等轴晶和网篮状柱状晶组成。铝含量(质量分数,%)为6时,熔覆层中即有α_22相(Ti_3Al为基)生成。随铝含量增加,显微硬度呈上升趋势,最高为900HV,是铝含量(质量分数,%)小于6时试样的1.3～1.5倍。耐磨性能逐步提高,摩擦系数和磨损率均呈降低趋势,而且以Ti_3Al基α_2脆性相的生成为转折点,生成后为生成前的0.5～0.7倍左右。To explore proper effects of aluminium in laser micro-molten pool, experiments of laser cladding Ti＋（1-8）%wt A1 on Ti- 6Al-4V by Nd：YAG had been carried out. The microstructures, microhardness and phases of the cladding layers with different weight percentage of Al were investigated. The content of Al was quantitatively determinated when ordering α2 ceramic phases （Ti3Al matrix） were formed. And the friction and wear properties were examined in atmosphere. It was found that the microstructure included bulky or imperfect arborescent crystal, fine or approximately equiaxial crystal and columnar crystals. The α2 ceramic phase was formed when the content of Al was 6%wt. With the increasing of weight percentage of A1, microhardness increased obviously. The maximum was 900 HV, 1.3-1.5 times of the layers with below 6%wt Al. Inversely, the wear resistance of the laser cladding layers were improved gradually. Friction coefficient and wear rate decreased, 0.5 -0.7 times of the layers with below 6%wt Al.

关 键 词：激光熔覆 微观组织 耐磨性能 钛合金 Ti3Al增强相 

分 类 号：TG151[金属学及工艺—热处理]