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| Effect of multi-direction forging on carbide evolution of M50 steel |
| WU Yu-cheng1,2, JIANG Hong-wei1, HU Yuan1, LIU Ying1, SHAN De-bin1, ZONG Ying-ying1 |
1. National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;
2. AECC Harbin Bearing Co. , Ltd. , Harbin 150070, Heilongjiang, China |
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Abstract Multi-direction forging (MDF) experiments with cumulative strains 1.2 and 5.4 were carried out on M50 steel at 1 000 ℃ and 1 100 ℃. The effect of cumulative strain and temperature on carbide fragment mechanism of M50 steel was analyzed. The results show that rod M2C carbides in original M50 steel were obviously broken after MDF and granular M23C6 carbides were obviously dissolved in 1 100 ℃. Low-temperature MDF made carbides show finer size and more dispersed morphology. The forgings had different deformations at different positions, resulting in different fragment effects of carbides. Carbide fragmentation was more obvious at the place where the deformation was large. Low temperature and high strain increased the level of stress concentration and increased the degree of primary carbide fragmentation. Stress concentration was the most important driving force for the fragmentation and dispersion of carbides.
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Received: 21 May 2020
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2020, Vol. 30 
