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Research of Flaking in Wheel Steel (Ⅰ) |
JIANG Bo1,CHEN Gang1,CUI Yinhui1,REN Xuechong2,CHU Wuyang2 |
1. Technology Center of Ma’anshan Steel and Iron Corporation, Ma’anshan 243000, Anhui, China; 2. Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The mechanism of flaking in wheel steel and the effects of flaking on fracture were investigated. The results show that a blisters nucleate and grow through diffusion and gathering of hydrogen atoms and vacancies when the hydrogen pressure is increased, microcracks initiate at the wall of the blister,and propagate which results in formation of flaking. The fracture with flaking is quasicleavage, similar to that of hydrogeninduced delayed cracking. The fracture morphology of the sample containing flaking is dependent upon the failure mode and the thickness of the sample. There is no effect of flaking on fracture surface morphology besides secondary cracks and local quasicleavage fracture.
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Received: 01 January 1900
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