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| High-cycle fatigue properties of controlled rolling and cooling microalloyed medium-carbon forging steels |
| WANG Zhan-hua1， HUI Wei-jun1， ZHANG Yong-jian1， HAO Yan-ying2， DAI Guan-wen2 |
| （1. School of Mechanical， Electronic and Control Engineering， Beijing Jiaotong University， Beijing 100044， China；
2. Technical Center， Shijiazhuang Iron and Steel Co.， Ltd.， HBIS Group， Shijiazhuang 050031， Hebei， China） |
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Abstract Most engineering components made of microalloyed medium carbon steels experience cyclic loading in serve，and thus high fatigue performance is also required. In order to evaluate the fatigue behavior of microalloyed medium carbon steel manufactured through controlled rolling and cooling process，high-cycle fatigue properties of a commonly used V-microalloyed medium carbon forging steel 38MnVS and a medium carbon forging steel 38MnS for comparison were studied by using rotating bending fatigue test. The results show that the ferrite fraction is increased and the microstructure is refined for the 38MnVS steel compared with that of the 38MnS steel. Physical-chemical phase analysis of the 38MnVS steel shows that about 54% V of the total V in the steel is tied up in the M（C，N） precipitates，while the mass percent of fine particles （less than 10 nm） is about 32% and the corresponding yield strength increment is about 116 MPa. There is an increase of about 62 MPa of fatigue limit，i.e. a relative increase of about 18%，of the 38MnVS steel compared with that of the 38MnS steel. The fatigue limit ratio increased from 0.43 for the 38MnS to 0.48 for the 38MnVS steel. It is revealed that the precipitation strengthening of fine M（C，N） particles and microstructure refining are primarily responsible for the enhanced fatigue property of the 38MnVS steel though it is still lower than that of the as-forged medium carbon steel. A simple method of estimating the fatigue limit of ferritic-pearlitic medium carbon steel is proposed based on the results of this study and those in the literature.
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Received: 30 July 2018
Published: 25 April 2019
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2019, Vol. 54 
