Effect of Shot Peening on Compressive Residual Stress Fields and Fatigue Life for TC4 Titanium Alloy
摘 要
研究了不同弹丸及喷丸参数对喷丸后TC4钛合金表面形貌、表面塑性变形程度、残余压应力场和疲劳寿命的影响。结果表明:与铸钢弹丸相比, 陶瓷弹丸喷丸强化后TC4钛合金表面的起伏程度变化不大, 但能有效地覆盖加工刀痕; 随喷丸压力增大和喷丸时间延长, 试样表面的累积塑性变形先快速增大后趋于饱和; 当喷丸压力达到0.25 MPa、铸钢弹丸喷丸时间大于40 s或陶瓷弹丸喷丸时间大于80 s时, 最大残余压应力可达到610 MPa, 残余压应力场深度超过250 μm; 两种弹丸喷丸强化后, TC4钛合金的疲劳寿命分别可提高10倍和20倍以上。
Abstract
The effects of different shots and shot peening processes on surface morphology, surface plastic deformation, compressive residual stress field and fatigue life of TC4 titanium alloy after shot peening were studied. The results show that compared with the TC4 titanium alloy strengthened by cast steel shot, the surface of the alloy strengthened by ceramic shot had little fluctuation, but the working marks could be covered effectively. The surface cumulative plastic deformation on sample surface raised firstly and then saturated with the increase of shot pressure and shot time. The maximal compressive residual stress and the deepth of residual stress field could reach 610 MPa and 250 μm, respectively, either when the peening time was more than 40 s using cast steel shot or when the peening time was more than 80 s using ceramic shot with the shot pressure of 0.25 MPa. The fatigue life of TC4 titanium alloy increased by more than 10 times and 20 times, respectively, after shot peening strengthening with the two shots.
中图分类号 TG668
所属栏目 材料性能及其应用
基金项目
收稿日期 2011/11/2
修改稿日期 2012/7/22
网络出版日期
作者单位点击查看
备注王强(1983-), 男,陕西安康人, 工程师, 硕士。
引用该论文: WANG Qiang,QIAO Ming-jie,ZHANG Wei,HUANG Li-jun. Effect of Shot Peening on Compressive Residual Stress Fields and Fatigue Life for TC4 Titanium Alloy[J]. Materials for mechancial engineering, 2012, 36(12): 53~56
王强,乔明杰,张炜,黄利军. 喷丸对TC4钛合金残余压应力场及疲劳寿命的影响[J]. 机械工程材料, 2012, 36(12): 53~56
被引情况:
【1】姬浩,刘国光, "孔挤压强化对7A85铝合金锻件组织和疲劳性能的影响",机械工程材料 39, 25-28(2015)
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【4】高玉魁,姚枚,邵培革,等.金属疲劳极限与静强度的相关性[J].机械强度,2001,23(1):15-18.
【5】姚枚,王声平,李金魁,等.表面强化件的疲劳强度分析及金属的内部疲劳极限[J].金属学报,1993,29(11):511-519.
【6】张志建,姚枚,李金魁,等. 喷丸强化件表象疲劳极限优化研究[J].机械工程材料,2003,27(10):7-11.
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