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| High–cycle fatigue fracture behavior of ferrite–pearlite type microalloyed steels |
| CHA Xiaoqin1; HUI Weijun2†; YONG Qilong2 |
1.Luoyang Ship Material Research Institute; Luoyang 471039
2.National Engineering Research Center of Advanced Steel Technology;
Central Iron and Steel Research Institute; Beijing 100081 |
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Cite this article:
CHA Xiaoqin; HUI Weijun; YONG Qilong. High–cycle fatigue fracture behavior of ferrite–pearlite type microalloyed steels. Chin J Mater Res, 2008, 22(6): 634-638.
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Abstract High–cycle fatigue fracture behaviors of three ferrite–pearlite type microalloyed steels with different carbon and vanadium content and one quenched and tempered (QT) low alloy steel 40Cr for comparison were investigated by rotating bending fatigue test. The results show that microstructure has a significant effect on the fatigue properties of the microalloyed forging steels. Both fatigue limit and fatigue limit ratio increase with increasing the hardness of ferrite and the fatigue limit ratio of 22MnVS steel is as high as 0.60, which is much higher than that of QT steel 40Cr. The formation of film–like ferrite along coarse prior austenite grain boundary deteriorates the fatigue properties of medium–carbon steels 38MnVS and 48MnS in as–rolled condition, which is lower than that of QT steel 40Cr. The fatigue fracture mechanism of microalloyed steels is different from that of QT steel. For the microalloyed steels, almost all the fatigue cracks initiated mainly along the boundary between ferrite and pearlite and propagated preferentially along that boundary, whereas for QT steel with same strength level, which does not possess soft phase of ferrite, the fatigue cracks easily initiated at coarse subsurface inclusions.
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Received: 16 January 2008
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