为了提高热作模具钢的热稳定性，在H13钢的基础上降V增Mn，设计了新型热作模具钢SDH3－Mod．通过热稳定性实验研究SDH3－Mod和H13在高温服役过程中的硬度变化趋势，结合Johnson?Mehl?Avrami（ JMA）方程和透射电子显微镜探讨其高温时效动力学过程及微观组织演变．研究表明：SDH3－Mod在高温下的热稳定性优于H13．620℃热稳保温中，SDH3－Mod的基体回复被延迟，碳化物粗化被有效抑制，表现出比H13更加优异的回火抗力，这是由于SDH3－Mod的淬火温度高于H13，马氏体基体中固溶了更多的合金元素，提高了基体的分解温度，从而延迟了马氏体基体的回复；同时，Mn固溶于基体中，降低了高温下碳在铁素体基体中的扩散速率，较好地抑制了碳化物的析出和长大．
To improve the resistance to tempering at high temperature, a newly martensitic hot work die steel ( SDH3-Mod ) was designed on the basis of H13 with decreasing V and increasing Mn, and the hardness variation, kinetic of thermal aging and their microstructure evolution of SDH3-Mod and H13 were studied at high temperature by Johnson?Mehl?Avrami (JMA) equation and transmission electron microscope (TEM). The results show that SDH3-Mod presents a better resistance to tempering at high temperature. The martensite recovering and carbide coarsening are efficiently inhibited. The softening behavior is evidently delayed in SDH3-Mod, which can be attributed to the α?Fe lattice distortion caused by Mn dissolving into martensite to reduce the diffusion rate of the high temperature carbon in the ferrite matrix, preferably inhibiting carbide coarsening;Meanwhile, the quenching temperature of SDH3-Mod is higher than that of H13, leading to the amount of alloying elements solid solution in the matrix to improve the decomposition temperature of the martensitic matrix.
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