Study on Rotating Bending Fatigue Property of Ti65 Titanium Alloy

2016 ◽  
Vol 849 ◽  
pp. 347-352
Author(s):  
Xu Wang ◽  
Si Qing Li ◽  
Jing Nan Liu
Keyword(s):  
Titanium Alloy ◽  
Fatigue Strength ◽  
Room Temperature ◽  
Fatigue Property ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
Notched Specimens ◽  
Different Temperatures ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

The rotating bending fatigue properties of Ti65 titanium alloy blisk forging was studied in the present investigation. The smooth and notched specimens were prepared to test the fatigue properties at room temperature and 650°C. Meanwhile, the influences on rotating bending fatigue of temperature and type were analyzed. Furthermore, the fractural morphology was observed through scanning electron microscopy. The results showed that the medium fatigue strength of Ti65 titanium alloy decreased at 650°C compared with that at room temperature, and the fatigue strength of notched specimens indicated the same significant declination at different temperatures compared with smooth specimens. At room temperature the medium fatigue strength of smooth and notched are 473MPa and 173MPa, respectively, and the fatigue notch sensitive coefficient was 0.87. At 650°C the medium fatigue strength of smooth and notched specimens are 427MPa and 168MPa, where the fatigue notch sensitive coefficient was 0.78.

scholarly journals Effects of Laser Peening on Rotating Bending Fatigue Properties of Ti-6Al-4V Titanium Alloy

2013 ◽  
Vol 62 (5) ◽  
pp. 297-304 ◽  
Author(s):  
Kiyotaka MASAKI ◽  
Youhei KAMESHIMA ◽  
Noriyuki HISAMORI ◽  
Yuji SANO ◽  
Koichi AKITA ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Properties ◽  
Laser Peening ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

scholarly journals AN INVESTIGATION OF FATIGUE PROPERTIES OF PRE-QUENCHED-TEMPERED S45C STEEL WITH PLASMA NITRIDING TREATMENT

2012 ◽  
Vol 06 ◽  
pp. 233-238
Author(s):  
Bo Wu ◽  
Jianxun Zhang ◽  
Ri-ichi Murakami
Keyword(s):  
Fatigue Strength ◽  
Crack Initiation ◽  
Plasma Nitriding ◽  
Fatigue Properties ◽  
Surface Residual Stress ◽  
Layer Compound ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fish Eye

Quenched and tempered (QT) S45C steel was processed by plasma nitriding (a mixture of 40% N 2-60% H 2, 400 Pa , 773 K ) with two different durations: 8 h and 48 h. The microhardness, surface residual stress and nitriding layer compound were separately detected and the effect was discussed with the fatigue test result. The rotating bending fatigue properties was test with QT, QT nitiding 8 h, QT nitriding 48 h specimens. Fish-eye type crack formation occurred and the two crack initiation modes, fish-eye crack initiation and surface crack initiation, were observed by the scanning electron microscope and discussed. The result showed that the fatigue strength of QT specimens were improved by 54% at least compared with the untreated specimens. But the QT and un-QT have the mainly same fatigue strength in the same plasma nitriding condition, especially no-improvement with the 48 h plasma nitriding specimens.

High Cycle Fatigue Behavior of Thermally Oxidized Ti6Al4V Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 2179-2182 ◽  
Author(s):  
Mehmet Cingi ◽  
Onur Meydanoglu ◽  
Hasan Guleryuz ◽  
Murat Baydogan ◽  
Huseyin Cimenoglu ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Yield Strength ◽  
Thermal Oxidation ◽  
Fatigue Behavior ◽  
Surface Hardness ◽  
Ti6al4v Alloy ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Bending Fatigue Strength

In this study, the effect of thermal oxidation on the high cycle rotating bending fatigue behavior of Ti6Al4V alloy was investigated. Oxidation, which was performed at 600°C for 60 h in air, considerably improved the surface hardness and particularly the yield strength of the alloy without scarifying the tensile ductility. Unfortunately, the rotating bending fatigue strength at 5x106 cycles decreased from about 610 MPa to about 400 MPa upon oxidation. Thus, thermal oxidation leaded a reduction in the fatigue strength of around 34%, while improving the surface hardness (HV0.1) and yield strength 85 % and 36 %, respectively.

scholarly journals Effects of Case Depth and Notch Shape on the Rotating Bending Fatigue Properties of Carburized Steel

1980 ◽  
Vol 66 (3) ◽  
pp. 410-417 ◽  
Author(s):  
Tôru FURUKAWA ◽  
Shizuyo KONUMA ◽  
Hideyasu SAKANIWA ◽  
Tadashi KASUYA
Keyword(s):  
Case Depth ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
Carburized Steel ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

scholarly journals Effect of Ultrasonic Surface Impact on the Fatigue Properties of Ti3Zr2Sn3Mo25Nb

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2107
Author(s):  
Zhangjianing Cheng ◽  
Xiaojian Cao ◽  
Xiaoli Xu ◽  
Qiangru Shen ◽  
Tianchong Yu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Strength ◽  
Fatigue Cracks ◽  
Dislocation Motion ◽  
Fatigue Properties ◽  
Surface Residual Stress ◽  
Initiation Zone ◽  
Rotating Bending Fatigue ◽  
Average Size ◽  
Grain Surface

The effect of nano grain surface layer generated by ultrasonic impact on the fatigue behaviors of a titanium alloy Ti3Zr2Sn3Mo25Nb (TLM) was investigated. Three vibration strike-numbers of 24,000 times, 36,000 times and 48,000 times per unit are chosen to treat the surface of TLM specimens. Nanocrystals with an average size of 30 nm are generated. The dislocation motion plays an important role in the transformation of nanograins. Ultrasonic surface impact improves the mechanical properties of TLM, such as hardness, surface residual stress, tensile strength and fatigue strength. More vibration strike numbers will cause a higher enhancement. With a vibration strike number of 48,000 times per square millimeter the rotating-bending fatigue strength of TLM at 107 cycles is improved by 23.7%. All the fatigue cracks initiate from the surface of untreated specimens, while inner cracks appear after the fatigue life of 106 cycles with the ultrasonic surface impact. The crystal slip in the crack initiation zone is the main way of growth for microcracks. Crack cores are usually formed at the junction of crystals. The stress intensity factor of TLM titanium alloy is approximately 7.0 MPa·m1/2.

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