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| Gigacycle Fatigue Behavior of 1800 MPa Grade High Strength Spring Steel for Automobile Lightweight |
| Ji-ming ZHANG1,Ling-kang JI1,Dong-jie BAO2,Yao-rong FENG1,Shou-xin LI3,Yu-qing WENG4 |
1. CNPC Tubular Goods Research Institute, Xi��an 710065, Shaanxi, China
2. Xingtai Polytechnic College,Xingtai 054035, Hebei, China
3. Institute of Metal Research, Academy of Sciences, Shenyang 110016,Liaoning, China
4. Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Gigacycle fatigue behavior of 60Si2CrVA high strength spring steel was investigated by ultrasonic fatigue test machine. Fatigue fractography was observed by scanning electron microscopy (SEM). Maximum inclusion sizes and fatigue strength in different volumes were estimated by statistics of extreme values (SEV) and generalized Pareto distribution (GPD) methods. The results showed that S-N curves of 60Si2CrVA spring steels for two rolling processes were not horizontal asymptotes but a gradient in a regime of 109 cycles, and traditional fatigue limits were eliminated. Surface machined topography and inclusions in steel were major factors that led to elimination of fatigue limit for 60Si2CrVA spring steel. The SEV and GPD methods could effectively predict size of the maximum inclusion and fatigue strength in different volumes of 60Si2CrVA spring steel. Predicted fatigue strength was in accordance with experimental results by ultrasonic fatigue testing.
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Received: 11 March 2013
Published: 05 June 2014
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Corresponding Authors:
Zhang Ji-Ming
E-mail: jiming_zhang@126.com
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2014, Vol. 21 
