1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, Henan, China 2 Collaborative Innovation Center of New Nonferrous Metal Materials and Advanced Processing Technology Jointly Established by the Ministry of Science and Technology, Luoyang 471023, Henan, China 3 State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi'an 710024, China 4 The 725th Research Institute of China Shipbuilding Industry Corporation, Luoyang 471023, Henan, China
The high cycle fatigue behavior of TC11 titanium alloy with lamellar structure before and after surface nanocrystallization was studied by supersonic fine particle bombardment (SFPB).The microstructure of the high cycle fatigue fracture and its vicinity were compared and analyzed by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD).The results show that there are 30-50 μm thick nanolayers on the surface of titanium alloy after SFPB treatment, and the size of nanocrystalline is about 5-15 nm.The fatigue performance is improved obviously and the fatigue life is increased about 8-10 times under the same stress level, the fatigue striation width becomes narrow, and the multiple of fatigue life increases gradually with the decrease of loading level.The fatigue fracture surface before and after SFPB treatment consists of the fatigue source zone, the crack propagation zone and the instantaneous fracture zone, but the fatigue source after SFPB treatment moves from the surface layer before treatment to the subsurface.After fatigue loading, the surface microstructure of SFPB treated specimens is still in nanometer scale, but there are a lot of deformation twins, dislocation tangles and a small amount of deformation-induced martensite in the subsurface microstructure.
LIU Q M , ZHANG Z H , LIU S F , et al. Application and development of titanium alloy in aerospace and military hardware[J]. Journal of Iron and Steel Research, 2015, 27 (3): 1- 4.
KIKUCHI S , NAKAMURA Y , NAMBU K , et al. Formation of a hydroxyapatite layer on Ti-29Nb-13Ta-4.6Zr and enhancement of four-point bending fatigue characteristics by fine particle peening[J]. International Journal of Lightweight Materials and Manufacture, 2019, 2 (3): 227- 234.
XIONG J H , LI S K , GAO F Y , et al. Microstructure and mechanical properties of Ti6321 alloy welded joint by GTAW[J]. Materials Science and Engineering: A, 2015, 640, 419- 423.
AO N , LIU D X , ZHANG X H , et al. The effect of residual stress and gradient nanostructure on the fretting fatigue behavior of plasma electrolytic oxidation coated Ti-6Al-4V alloy[J]. Journal of Alloys and Compounds, 2019, 811, 1- 11.
XU L , HUANG S J , LI H , et al. Small fatigue crack growth behavior of TB6 titanium alloy[J]. Journal of Materials Engineering, 2019, 47 (11): 171- 177.
ZHENG H Z , GUO S H , LUO Q H , et al. Effect of shot peening on microstructure, nanocrystallization and microhardness of Ti-10V-2Fe-3Al alloy surface[J]. Journal of Iron and Steel Research International, 2019, 26 (1): 52- 58.
ZHANG G X , WU J J , GAO Y , et al. Experimental study on laser shock peening of TC17 titanium alloy[J]. Surface Technology, 2018, 47 (3): 96- 100.
CHEN Y X , WANG J C , GAO Y K , et al. Effect of shot peening on fatigue performance of Ti2AlNb intermetallic alloy[J]. International Journal of Fatigue, 2019, 57, 53- 57.
LIU C S , LIU D X , ZHANG X H , et al. Improving fatigue performance of Ti-6Al-4V alloy via ultrasonic surface rolling process[J]. Journal of Materials Science and Technology, 2019, 35, 1555- 1562.
LI H M , LI M Q , LIU Y G , et al. Research progress in nanocrystalline microstructure, mechanical properties and nanocrystallization mechanism of titanium alloys via surface mechanical treatment[J]. The Chinese Journal of Nonferrous Metals, 2015, 25 (3): 642- 651.
FAN M X , XIONG Y , CHEN Y N , et al. Fatigue fracture and microstructure of TC11 titanium alloy after high cycle fatigue at room temperature[J]. Journal of Henan University of Science and Technology (Natural Science), 2019, 40 (1): 6- 11.
ZHANG X C , ZHANG Y K , LU J Z , et al. Improvement of fatigue life of Ti-6Al-4V alloy by laser shock peening[J]. Materials Science and Engineering: A, 2010, 527 (15): 3411- 3415.
NIE X F , HE W F , ZANG S H , et al. Effect study and application to improve high cycle fatigue resistance of TC11 titanium alloy by laser shock peening with multiple impacts[J]. Surface and Coatings Technology, 2014, 253, 68- 75.
WEN A L , YAN X X , REN R M , et al. Effect of high-energy shot peening time on fatigue performance of TC4 alloy[J]. Hot Working Technology, 2009, 38 (14): 127- 129.
OUYANG D L , LU S Q , CUI X , et al. Transformation of deformation-induced martensite in TB6 titanium alloy[J]. The Chinese Journal of Nonferrous Metals, 2010, 20 (12): 2307- 2012.
林翠, 杜楠. 钛合金选用与设计[M]. 北京: 化学工业出版社, 2014: 100- 152.
LIN C , DU N . Selection and design of titanium alloys[M]. Beijing: Chemical Industry Press, 2014: 100- 152.
闫秀侠. 高能喷丸表面纳米化对TC4合金疲劳性能的影响[D]. 大连: 大连交通大学, 2009.
YAN X X. Effect of nanocrystallization in surface layer on fatigue strength of TC4 titanium alloy by high energy shot peening[D]. Dalian: Dalian Jiaotong University, 2009.
SUN R J , LI L H , ZHU Y , et al. Fatigue of Ti-17 titanium alloy with hole drilled prior and post to laser shock peening[J]. Optics and Laser Technology, 2019, 115, 166- 170.