多次激光喷丸作用下TC4钛合金的疲劳性能及微裂纹扩展预测模型
Fatigue Properties and Crack Growth Prediction Model of TC4Titanium Alloy Subjected to Multiple Laser Shot Peening
摘 要
对TC4钛合金板进行不同次数激光喷丸处理，再进行高周疲劳试验，研究了其疲劳性能及断裂机理；基于残余压应力及晶界介微观尺寸对微裂纹扩展的阻滞作用，采用抑制参数、张开应力强度因子、残余应力强度因子对Paris公式进行修正，建立了激光喷丸处理后疲劳微裂纹扩展预测模型，并进行了试验验证。结果表明：随着喷丸次数增加，TC4钛合金的疲劳强度增大，疲劳寿命延长，断裂方式由脆性断裂向韧性断裂转变；疲劳微裂纹预测模型预测得到的疲劳寿命与试验值的相对误差小于10%，说明模型准确。
疲劳性能
残余压应力
裂纹扩展预测模型
laser shot peening
fatigue property
residual compressive stress
crack growth prediction model
Abstract
TC4 titanium alloy plates were subjected to laser shot peening for different times and then subjected to high cycle fatigue tests. The fatigue properties and fracture mechanism of the alloy were studied. Considering the retardation effect of the residual compressive stress and the mesoscopic size of grain boundaries on the microcrack growth, the suppression parameter, open stress intensity factor and residual stress intensity factor were introduced to modify the Paris formula. Then a prediction model for fatigue microcrack growth after laser shot peening was established and verified by experiments. The results show that with the increase of the number of shot peening, the fatigue strength and fatigue life of the TC4 titanium alloy increased, and the fracture mode changed from brittle fracture to ductile fracture. The relative errors of the fatigue life predicted by the fatigue microcrack prediction model and the test results were less than 10%, indicating that the model was accurate.
中图分类号 TG39 DOI 10.11973/jxgccl202105018
所属栏目 物理模拟与数值模拟
基金项目 苏州健雄职业技术学院2019年度校科学基金资助项目（自然科学类）（2019QNZK008）；太仓市基础研究计划（面上）项目（TC2020JC13）；浙江省基础公益研究计划项目（LGF18E090001）
收稿日期 2020/6/12
修改稿日期 2021/3/24
网络出版日期
作者单位点击查看
备注周晓刚(1976-),男,江苏太仓人,副教授,硕士
引用该论文: ZHOU Xiaogang,JI Feifei. Fatigue Properties and Crack Growth Prediction Model of TC4Titanium Alloy Subjected to Multiple Laser Shot Peening[J]. Materials for mechancial engineering, 2021, 45(5): 100～104
周晓刚,纪飞飞. 多次激光喷丸作用下TC4钛合金的疲劳性能及微裂纹扩展预测模型[J]. 机械工程材料, 2021, 45(5): 100～104
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参考文献
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【2】HUANG S, ZHU Y, GUO W, et al. Impact toughness and microstructural response of Ti-17 titanium alloy subjected to laser shock peening[J]. Surface and Coatings Technology, 2017, 327:32-41.
【3】VOISIN T, CALTA N P, KHAIRALLAH S A, et al. Defects-dictated tensile properties of selective laser melted Ti-6Al-4V[J]. Materials & Design, 2018, 158:113-126.
【4】TAN L, YAO C F, ZHANG D H, et al. Evolution of surface integrity and fatigue properties after milling, polishing, and shot peening of TC17 alloy blades[J]. International Journal of Fatigue, 2020, 136:105630.
【5】ZHANG H, REN Z C, LIU J, et al. Microstructure evolution and electroplasticity in Ti64 subjected to electropulsing-assisted laser shock peening[J]. Journal of Alloys and Compounds, 2019, 802:573-582.
【6】LI H M, LIU Y G, LI M Q, et al. The gradient crystalline structure and microhardness in the treated layer of TC17 via high energy shot peening[J]. Applied Surface Science, 2015, 357:197-203.
【7】任旭东, 张永康, 周建忠, 等. 激光冲击对金属板料裂纹的影响模型[J]. 中国机械工程, 2008, 19(3):358-360. REN X D, ZHANG Y K, ZHOU J Z, et al. Study on metal crack mode under laser-shock processing[J]. China Mechanical Engineering, 2008, 19(3):358-360.
【8】李媛, 何卫锋, 周舟. 变参数激光冲击TC17钛合金疲劳裂纹扩展特性[J]. 激光与红外, 2017, 47(10):1228-1233. LI Y, HE W F, ZHOU Z. Fatigue crack propagation property of TC17 titanium alloy by laser shock peening[J]. Laser & Infrared, 2017, 47(10):1228-1233.
【9】SUN R J, LI L H, GUO W, et al. Laser shock peening induced fatigue crack retardation in Ti-17 titanium alloy[J]. Materials Science and Engineering:A, 2018, 737:94-104.
【10】WANG Y, PHILP B, XU Z Y, et al. Study on fatigue crack growth performance of EH36 weldments by laser shock processing[J]. Surfaces and Interfaces, 2019(15):199-204.
【11】倪向贵, 李新亮, 王秀喜. 疲劳裂纹扩展规律Paris公式的一般修正及应用[J]. 压力容器, 2006, 23(12):8-15. NI X G, LI X L, WANG X X. General modification and application of the Paris law for fatigue crack propagation[J]. Pressure Vessel Technology, 2006, 23(12):8-15.
【12】王永廉, 吴永端. 一个适用性广泛的疲劳裂纹扩展速率表达式[J]. 航空学报, 1987, 8(4):191-197. WANG Y L, WU Y D. A universally applicable fatigue crack-growth-rate decription[J]. Acta Aeronautica et Astronautica Sinica, 1987, 8(4):191-197.
【13】TADDESSE A T, ZHU S P, LIAO D, et al. Cyclic plastic zone-based notch analysis and damage evolution model for fatigue life prediction of metals[J]. Materials & Design, 2020, 191:108639.
【14】崔振旗, 徐可为, 胡奈赛. 残余压应力场中疲劳短裂纹扩展模型及实验[J]. 金属学报, 1994, 30(2):65-69. CUI Z Q, XU K W, HU N S. Model and experiments on fatigue short crack growth in residual stress field[J]. Acta Metallrugica Sinica, 1994, 30(2):65-69.
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