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High-Cycle Fatigue Fracture Behavior of Microalloyed Bainitic Steels for Hot Forging

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Abstract:

High-cycle fatigue fracture behavior of microalloyed bainitic steels with three different carbon and vanadium contents were studied using rotating-bending fatigue test and compared with the ferrite-pearlite type microalloyed steel F38MnVS. The results indicated that the fatigue properties of the microaIloyed bainitic steels had a significant relation to the microstructures in forging condition. Compared with the ferrite-pearlite type microalloyed steel F38MnVS, the bainitic steels possessed higher fatigue strength and lower fatigue limit ratio σ-1/Rm. It was found that the bainitic transformation temperature was decreased and the hardness of the bainitic ferrite was enhanced, at the same time, the fatigue strength was increased, however, the fatigue limit ratio was lower. Furthermore, according to the SEM images of the fracture surface of fatigue specimens, it was revealed that the fatigue cracks mainly initiated along the bainitic ferrite laths in the specimen surface and preferred to propagate along the length direction of laths.

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Info:

Periodical:

Advanced Materials Research (Volumes 634-638)

Pages:

1746-1751

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.634-638.1746

Citation:

Cite this paper

Online since:

January 2013

Authors:

Fang Zhong Hu, Wei Jun Hui, Qi Long Yong

Keywords:

Fatigue Crack Initiation and Propagation, High-Cycle Fatigue Property, Medium-Carbon Microalloyed Steel, Microalloyed Bainitic Steel, Microstructure

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