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| Effect of Inclusion Size on HighCycle Fatigue Behavior of High Strength Spring Steel |
ZHAO Haimin1,HUI Weijun1,NIE Yihong1,
DONG Han1,WENG Yuqing1,2 |
| 1. National Engineering Research Center of Advanced Steel Technology, Beijing 100081, China; 2. The Chinese Society for Metals, Beijing 100711， China |
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Abstract The high cycle fatigue fracture behavior of three heats commercial spring steels 60Si2CrVA were studied by using rotating bar twopoint bending fatigue machine in the highcycle regime up to 107 cycles. The experimental results indicated that there is significant difference in the fatigue properties of steels, with same oxygen content. Further investigation revealed that this difference is mainly caused by the difference in inclusion size. That means, both fatigue life and fatigue strength increase with decreasing inclusion size. For D60, in which the average inclusion size is 44.4 μm the SN curve displays a continuous decline without conventional limit and fatigue failures originated mainly from large oxide inclusions.For A60,which has the smallest inclusion size of about 15.4 μm, all the fatigue cracks except two did not initiate from inclusions but from specimen surface and there was conventional limit. In the case of internal inclusioninduced fracture at cycles beyond 1×106, inclusions were found inside the fisheye and granular bright facets (GBF) were observed in the vicinity of inclusions.
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Received: 01 January 1900
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2008, Vol. 43 
