Hot deformation behavior and hot processing map of N-containing H13 hot working die steel
A Gleeble-3800 thermal simulation testing machine was used to conduct unidirectional single-pass compression tests at different temperatures for N-containing H13 hot working die steel.The hot deformation behavior of the steel was studied under conditions of strain rate of 0.01-10 s-1 and deformation temperature of 900-1250 ℃.Based on the high-temperature stress-strain curves,a constitutive model of the steel was established using hyperbolic sine function theory,and the hot processing map under different strains was established based on the dynamic material model.The results show that under high temperature hot compression deformation,the flow stress of the N-containing H13 hot working die steel decreases with the increase of deformation temperature and the decrease of strain rate.When the deformation temperature is above 1100 ℃ and the strain rate is less than 0.1 s-1,the flow stress curves of the N-containing H13 hot working die steel exhibit dynamic recrystallization characteristics.The hot deformation activation energy of the N-containing H13 hot working die steel is 610.23 kJ/mol,and the suitable hot working process region is deformation temperature of 1100-1250 ℃ and strain rate of 0.8-10 s-1.
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NSTL
万方数据
维普
