高能喷丸时间对TC4疲劳性能的影响  

Effect of High-energy Shot Peening Time on Fatigue Performance of TC4 Alloy

作　　者：温爱玲[1] 闫秀侠[2] 任瑞铭[2] 王生武[3] 

机构地区：[1]大连交通大学机械工程学院,辽宁大连116028 [2]大连交通大学材料科学与工程学院,辽宁大连116028 [3]大连交通大学土木与安全工程学院,辽宁大连116028

出　　处：《热加工工艺》2009年第14期127-129,共3页Hot Working Technology

基　　金：国家自然科技基金资助项目(50171017);辽宁省自然科技基金资助项目(20022115);大连市科技基金资助项目(大科技发[2002]114)

摘　　要：采用离心式喷丸机对TC4圆棒试样进行高能喷丸表面纳米化,研究了TC4表面纳米化及其对疲劳性能的影响,并进行了旋转弯曲疲劳试验;同时,通过SEM观察、硬度测试和XRD分析等对高能喷丸工艺提高疲劳极限的效果、表面损伤的影响等进行了分析。结果表明:采用离心式喷丸机进行高能喷丸使TC4材料的表面晶粒细化到18～22 nm,并有效地提高了其疲劳极限;随喷丸时间延长,晶粒尺寸进一步减小,但表层损伤程度加大,如何降低表面损伤,是高能喷丸提高疲劳极限的关键因素。The surface nano-crystallization on TC4 （Ti6Al4V） alloys was carried out by high-energy shot peening. The effects of surface nano-crystallization on the fatigue limit of TC4 were studied. Additional, the influences of the surface nano-crystallization process and the surface damage on the fatigue limit were analyzed by SEM, measurement of micro-vickers hardness distributions and XRD method. The results show that grain size on surface of TC4 are refined to 18-22 nm by surface nano-crystallization of centrifugal shot peening and fatigue limits are effectually enhanced; as the shot peening time becomes longer, though the grain size are refined, the surface damage are heavier, which reduces the fatigue limit.

关 键 词：高能喷丸 表面纳米化 疲劳强度 TC4 

分 类 号：TG156.99[金属学及工艺—热处理]