摘要
分析了TC18钛合金表面喷丸强化所产生的表面形貌、表面粗糙度、表面残余应力和表面层残余压应力场变化及喷丸对拉-拉疲劳性能的影响,并用疲劳裂纹萌生的微细观过程理论合理解释了拉-拉疲劳极限的提高。结果表明:喷丸强化不仅能够明显延长TC18钛合金的高周疲劳寿命,且能使1×107周次下的疲劳极限提高27%。
The changes of surface topography, surface roughness, surface residual stress, and compressive residual stress field caused by shot peening and its effects on tension-tension fatigue properties of TC18 titanium alloy were studied. The results show that the fatigue limit of shot-peened TC18 for 1 X 10(7) cycles increased by about 27% and the endurance life under the high cycle testing also increased significantly. The result can be explained in terms of the micro-meso-process theory for fatigue crack initiation.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2004年第9期1000-1002,共3页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目资助(59971040)
关键词
TC18钛合金
疲劳
喷丸
残余应力
TC18 titanium alloy
fatigue
shot peening
residual stress
