【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。更多还原

【Abstract】 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 resistance 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 resistance 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.更多还原