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Thermal stability mechanism of a new hot working die steel SDH3-Mod
Author(s): JI Tianyu, WU Xiaochun, School of Materials Science and Engineering, Shanghai University
Pages: 29-
35
Year: 2014
Issue:
6
Journal: Materials Science and Technology
Keyword: hot working die steel; thermal stability; temper resistance; JMA equation; carbide;
Abstract: 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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