Daoxin LIU
,
Xiaodong ZHU
,
Bin TANG
,
Jiawen HE
材料科学技术（英文）
Ion beam enhanced deposition (IBED) was employed to increase the fretting fatigue resistance of Ti6Al4V. CrN and TiN hard coatings were applied on the base material and shot peening was combined with the hard coatings to study the duplex effect on fretting fatigue resistance. The IBED coatings exhibited a good bonding strength. They did not spall off even after shot peening. However, an optimum composition of CrN showed better fretting fatigue resistance than that of TiN with the same processing parameters.
关键词:
Fretting fatigue
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Xiaohua ZHANG
,
Daoxin LIU
金属学报(英文版)
doi:10.1016/S1006-7191(08)60080-0
Effects of the temperature, slip amplitude, and contact pressure on fretting fatigue (FF) behavior of the Ti811 titanium alloy were investigated using a high frequency fatigue machine and a home-made high temperature apparatus. The fretting fatigue failure mechanism was studied by observing the fretting surface morphology features. The results show that the sensitivity to fretting fatigue is high at both 350 and 500℃. The higher the temperature, the more sensitive to the fretting fatigue failure is. Creep is an important factor that influences the fretting fatigue failure process at elevated temperatures. The fretting fatigue life of the Ti811 alloy does not change in a monotonic way as the slip amplitude and contact pressure increase. This is owing to the fact that the slip amplitude affects the action of fatigue and wear in the fretting process, and the nominal contact pressure affects the distribution and concentration of the stress and the amplitude of fretting slip at the contact surface, and thus further influences the crack initiation probability and the driving force for propagation.
关键词:
Fretting fatigue (FF)
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