表面完整性对Ti6Al4V钛合金疲劳性能的影响  

Influences of Surface Integrity on Fatigue Property of Ti6Al4V Alloy

作　　者：曹秀中[1] 韩秀全[2] 盖鹏涛[2] 

机构地区：[1]无锡职业技术学院机械技术学院 [2]中航工业北京航空制造工程研究所

出　　处：《航空制造技术》2014年第14期95-97,100,共4页Aeronautical Manufacturing Technology

摘　　要：研究了Ti6A14V钛合金表面喷丸强化及光饰处理后表面粗糙度、表面残余应力和表面层微观组织结构等表面完整性因素的变化及其对高周疲劳性能的影响。结果表明，Ti6A14V钛合金对表面粗糙度和表面残余应力比较敏感，经喷丸强度为0．10～0．20mmA的强化后，受喷表面的残余压应力和粗糙度持续提高，Ti6A14V钛合金的疲劳寿命增加值先升高后降低；后续光饰处理使强化后的材料表面粗糙度显著降低，促进了疲劳寿命进一步提高。表面完整性影响因素的平衡与协调对Ti6A14V钛合金疲劳性能的提高有着非常重要的影响。The influences of variations of surface integrity including surface roughness, surface re- sidual stress, and microstructure caused by shot peening and vibration polishing on high cycle fatigue property of Ti6A14V alloy are studied in this paper. The experimental results reveal that the effects of surface roughness and residual stress on fatigue property must be considered. Surface compressive residual stress and surface roughness induced by shot peening with the intensity of 0.10-0.20mmA increase persistently and the increasing extent of fatigue life of Ti6Al4V alloy firstly increases and then decreases. The vibration polishing process is more advantageous to fatigue improvement. The fatigue property of Ti6Al4V alloy is significantly influenced by balance and coordination of surface integrity factors.

关 键 词：表面完整性 喷丸 光饰 疲劳性能 

分 类 号：V252.2[一般工业技术—材料科学与工程]