【作者】 邱诗龙； 任瑞铭； 王生武； 陈春焕； 吴为； 李志强； 曾元松；

【Author】 QIU Shi-long~1 REN Rui-ming~1 WANG Sheng-wu~1 CHEN Chun-huan~1 Wu Wei~2, Li Zhi-qiang~2, Zeng Yuan-song~2 (1. Dalian Jiaotong University, Dalian, 116028, China, 2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, China)

【机构】 大连交通大学； 北京航空制造工程研究所；

【摘要】 用高能喷丸技术对工业纯钛进行了表面纳米化处理,分析了表层组织和表层硬度,并通过与普通喷丸的对比实验,研究了两种喷丸方法对工业纯钛疲劳性能的影响。结果得出,高能喷丸使表层组织明显细化,得到了无明显特征的强烈塑性变形组织,表层硬度明显提高。但高能喷丸并没有使疲劳强度大幅度提高,甚至低于传统喷丸。断口分析中发现,在高能喷丸疲劳断口裂纹源处,能看到由于喷丸不当造成的表面深坑和微裂纹等表面机械损伤,这可能是高能喷丸表面纳米化比传统喷丸没有表现出更高疲劳强度的原因。更多还原

【Abstract】 The surface nanocrystallization treatment for commercial pure titanium was performed using high energy shot peening (HESP), and the microstmcture and the hardness were analyzed. Comparing the commercial pure titanium treated vir high energy shot peening with normal shot peening, the effects of two different shot peening methods on fatigue properties were studied. The experimental results showed that the surface of commercial pure titanium which was realized by high energy shot peening had nanostructured microstmcture and higher hardness. But the fatigue properties were not modified evidently as proposed, even worse than the normal shot peening. On the fatigue fracture surfaces, it could be found that there are some mechanical damages, such as pits or cracks, on the surface treated vir high energy shot peening at the fatigue crack initial areas, which might be resulted in the inapparent increase of the fatigue strength for high energy shot peening specimens.更多还原