Tempering stability of Fe–Cr–Mo–W–V hot forging die steels
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第10期
论文作者：Yuan-ji Shi Xiao-chun Wu Jun-wan Li Na Min
文章页码：1145 - 1157
摘 要：The tempering stability of three Fe–Cr–Mo–W–V hot forging die steels（DM, H21, and H13） was investigated through hardness measurements and transmission electron microscopy（TEM） observations. Both dilatometer tests and TEM observations revealed that DM steel has a higher tempering stability than H21 and H13 steels because of its substantial amount of M2C（M represents metallic element） carbide precipitations. The activation energies of the M2C carbide precipitation processes in DM, H21, and H13 steels are 236.4, 212.0, and 228.9 kJ/mol, respectively. Furthermore, the results indicated that vanadium atoms both increase the activation energy and affect the evolution of M2C carbides, resulting in gradual dissolution rather than over-aging during tempering.
Yuan-ji Shi，Xiao-chun Wu，Jun-wan Li，Na Min
School of Materials Science and Engineering, Shanghai University
摘 要：The tempering stability of three Fe–Cr–Mo–W–V hot forging die steels（DM, H21, and H13） was investigated through hardness measurements and transmission electron microscopy（TEM） observations. Both dilatometer tests and TEM observations revealed that DM steel has a higher tempering stability than H21 and H13 steels because of its substantial amount of M2C（M represents metallic element） carbide precipitations. The activation energies of the M2C carbide precipitation processes in DM, H21, and H13 steels are 236.4, 212.0, and 228.9 kJ/mol, respectively. Furthermore, the results indicated that vanadium atoms both increase the activation energy and affect the evolution of M2C carbides, resulting in gradual dissolution rather than over-aging during tempering.
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