复合表面改性协同增强Ti合金高温微动疲劳抗力  

Synergistic improving fretting fatigue resistance of Ti alloy at elevated temperature by duplex surface modification

作　　者：张晓化[1] 刘道新[1] 唐长斌[1] 高广睿[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《中国有色金属学报》2006年第4期599-605,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50171054;50371060);航空科学基金资助项目(01H53066)

摘　　要：研究了Ti 811(Ti8Al1Mo1V)钛合金表面离子束增强沉积(IBED)0Cr18Ni9膜层的膜基界面成分分布、膜基结合强度、膜层硬度和摩擦学行为。利用喷丸形变强化对IBED膜层进行后处理,拟达到联合提高钛合金高温微动疲劳抗力的目的。结果表明:离子束增强沉积技术可以获得致密度高,晶粒细化,孔隙率低,膜基结合强度高的0Cr18Ni9膜层,从而显著提高了钛合金表面硬度和耐磨性能;离子束增强沉积0Cr18Ni9膜层的耐磨性能与喷丸形变强化引入的表层残余压应力协同作用,使Ti 811合金在350℃高温下的微动疲劳抗力显著提高,并且高于喷丸强化或IBED膜层的单独作用。The 0Cr18Ni9 film was deposited on Ti 811 titanium alloy surface by ion-beam-enhanced deposition （IBED）. The composition distribution, bonding strength, hardness and the wear resistance of the film were investigated. Shot peening was introduced to post treat the modified surface in order to synergistically improve the fretting fatigue resistance of Ti alloy. The results indicate that IBED can prepare 0Cr18Ni9 film with high density, small grain size, low void radio and high bonding strength. Thus the hardness, wear resistance and fretting fatigue resist- ante of Ti 811 alloy are increased remarkably. Compared with shot peening treatment or ion-beam-enhanced deposition coating alone, the titanium alloy after IBED 0Cr18Ni9 combined shot peening shows high fretting fatigue resistante at elevated temperature of 350℃. This is due to the synergistic effect of the high wear resistance of the film surface and the residual compressive stress induced by shot peening.

关 键 词：钛合金 微动疲劳 复合表面改性 高温 喷丸强化 离子束增强沉积 

分 类 号：TG115[金属学及工艺—物理冶金]