Residual stress relaxation and re-shot-peening process of wet shot-peened titanium alloy during tensile fatigue load
ZHAO Hui-sheng1, CHEN Guo-qing1, GAI Peng-tao2, LI Zhi-qiang2, ZHOU Wen-long1, FU Xue-song1
1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, Liaoning, China;
2. Aeronautical Key Laboratory for Plastic Forming Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China
Abstract：The surface of TC4 titanium alloy was treated by wet shot-peening (SP). The residual stress relaxation during high and low cycle tensile fatigue was studied, and the effect of re-shot-peening (RSP) on fatigue life was discussed. The results show that relaxation of compressive residual stress still occurs under tensile stress. The fatigue load level has an important influence on the relaxation rate, degree and range of compressive residual stress field (CRSF) of shot peened TC4 titanium alloy. Residual stress relaxation during high cycle fatigue (HCF) mainly occurs in the near surface layer of 0-30 μm, and the relaxation rate is slow, while residual stress relaxation in low cycle fatigue (LCF) mainly occurs in the range of 0-80 μm, which is deeper and faster. RSP also has a great influence on the fatigue life of TC4 titanium alloy. It can significantly improve fatigue life at 25% and 50% of initial SP fatigue life, but has little effect on fatigue life at 75% of initial SP fatigue life. In addition, the strengthening effect of RSP is related to the level of fatigue load, which improves the HCF life obviously.
[1] 王仁智. 金属材料的喷丸强化原理及其强化机理综述[J].中国表面工程,2012,25(6):1-9. WANG R Z.Overview on the shot peening principle and its strengthening mechanisms for metallic materials[J].China Surface Engineering,2012,25(6):1-9.
[2] GONZÁLEZ J,BAGHERIFARD S,GUAGLIANO M,et al.Influence of different shot peening treatments on surface state and fatigue behaviour of Al 6063 alloy[J].Engineering Fracture Mechanics,2017,185:72-81.
[3] 李康.湿喷丸强化Ti-6Al-4V合金的微动磨损和微动疲劳行为及其机理研究[D].大连:大连理工大学,2016. LI K.Investigation on the fretting wear and fretting fatigue mechanism of Ti-6Al-4V strengthened by wet peening treatment[D].Dalian:Dalian University of Technology,2016.
[4] BAGHERIFARD S,FERNANDEZPARIENTE I,GHELICHI R,et al.Effect of severe shot peening on microstructure and fatigue strength of cast iron[J].International Journal of Fatigue,2014,65:64-70.
[5] MALEKI E,ZABIHOLLAH A.Modeling of shot-peening effects on the surface properties of a(TiB+TiC)/Ti-6Al-4V composite employing artificial neural networks[J].Materiali in Tehnologije,2016,50(6):851-860.
[6] FRIDRICI V,FOUVRY S,KAPSA P.Effect of shot peening on the fretting wear of Ti-6Al-4V[J].Wear,2001,250(1/12):642-649.
[7] 侯帅,朱有利,邱骥,等.喷丸强化对Ti6Al4V半椭圆表面裂纹J积分和裂纹扩展速率的影响[J].材料工程, 2019,47(1):139-146. HOU S,ZHU Y L,QIU J,et al.Effect of shot peening on J-integral and crack propagation rate of semi-elliptic surface crack on Ti6Al4V[J].Journal of Materials Engineering,2019,47(1):139-146.
[8] TORRES M A S,HARADA D T,BAPTISTA C A R P,et al.Effect of shot peening on fatigue behavior of AISI 4340 in different loading conditions[J].Key Engineering Materials,2016,713:30-33.
[9] GAO Y K,YAO M,SHAO P G,et al.Another mechanism for fatigue strength improvement of metallic parts by shot peening[J].Journal of Materials Engineering and Performance,2003,12(5):507-511.
[10] JAMES M N,NEWBY M,HATTINGH D G,et al.Shot-peening of steam turbine blades:residual stresses and their modification by fatigue cycling[J].Procedia Engineering,2010,2(1):441-451.
[11] CHEONG W C D,ZHUANG W Z,ZHANG L C.Study of residual stress relaxation using X-ray diffraction[J].Key Engineering Materials,2004,274/276:871-876.
[12] ZHAN K,JIANG C H,JI V.Residual stress relaxation of shot peened deformation surface layer on S30432 austenite steel under applied loading[J].Materials Transactions,2012,53(9):1578-1581.
[13] 闫德俊.高速列车底架用铝合金焊接接头疲劳裂纹扩展特性[D].哈尔滨:哈尔滨工业大学,2011. YAN D J.Characteristics of fatigue crack propagation in welded joint of aluminum alloy used in vehicle chasis of high speed train[D].Harbin:Harbin Institute of Technology,2011.
[14] TORRES M A S,VOORWALD H J C.An evaluation of shot peening,residual stress and stress relaxation on the fatigue life of AISI 4340 steel[J].International Journal of Fatigue,2002,24(8):877-886.
[15] BOYCE B L,CHEN X,PETERS J O,et al.Mechanical relaxation of localized residual stresses associated with foreign object damage[J].Materials Science and Engineering:A,2003,349(1/2):48-58.
[16] XIE L,WEN Y,ZHAN K,et al.Characterization on surface mechanical properties of Ti-6Al-4V after shot peening[J].Journal of Alloys and Compounds,2016,666:65-70.
[17] MAJZOOBI G H,AHMADKHANI A R.The effects of multiple re-shot peening on fretting fatigue behavior of Al7075-T6[J].Surface and Coatings Technology,2010,205(1):102-109.
[18] LEE H,MALL S,SATHISH S.Investigation into effects of re-shot-peening on fretting fatigue behavior of Ti-6Al-4V[J].Materials Science and Engineering:A, 2005,390(1/2):227-232.
[19] 王欣,高玉魁,王强,等.再次喷丸周期对TC18钛合金疲劳寿命的影响[J].材料工程,2012(2):67-71. WANG X,GAO Y K,WANG Q,et al.Effect of re-shot-peening on the fatigue life of TC18 titanium alloy[J].Journal of Materials Engineering,2012(2):67-71.
[20] 柴惠芬,陈新增,梁新,等.单向拉伸及循环载荷下材料的屈服及塑变传播[J].西安交通大学学报,1986,20(4):43-52. CHAI H F,CHEN X Z,LIANG X,et al.Yielding and propagation of plastic deformation under unidirectional tensile and cyclic loading[J].Journal of Xi'an Jiaotong University,1986,20(4):43-52.
[21] JIANG X P,MAN C S,SHEPARD M J,et al.Effects of shot-peening and re-shot-peening on four-point bend fatigue behavior of Ti-6Al-4V[J].Materials Science and Engineering:A,2007,468/470:137-143.
2020, Vol. 48 
