Abstract
The metastable M2C carbide in a multi-component semi-high-speed steel shows an in situ decomposition during heat treatment. M2C carbides transform themselves into an aggregate of three secondary carbides (M6C, MC, M7C3) at the M2C carbide/γ-Fe matrix interface through the diffusion of various alloying elements. The content of the decomposition products decreases in the order of M6C, MC, and M7C3. The Fe-rich M6C is considered to be the η 2-type carbides of (Cr, V, Fe)4(Mo, W)2C, the MC consists primarily of V as the crystallized carbide does, and the M7C3 with 70 at. pct of Cr and Fe in total is formed only during heat treatment but not during solidification. At the heat treatment temperature of 1273 K (1000 °C), a new approximate reaction equation of M2C + 0.052γ-Fe → 0.687M6C + 0.044M7C3 + 0.320MC is proposed based on the measurement of the composition of carbides; moreover, a modified prediction model of transformation ratio of M2C carbide is obtained according to the DSC experiments.
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The authors are grateful to the National Natural Science Foundation of China (Grant No. 51101136), the Natural Science Foundation-Steel and Iron Foundation of Hebei Province, China (Grant No. E2016203284), and the College Science and Technology Research Project of Hebei Province, China (Grant No. QN2014107) for their financial support.
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Chen, L., Pei, J., Li, F. et al. Decomposition Reaction of Metastable M2C Carbide in a Multi-Component Semi-High-Speed Steel. Metall Mater Trans A 47, 5662–5669 (2016). https://doi.org/10.1007/s11661-016-3795-x
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DOI: https://doi.org/10.1007/s11661-016-3795-x