Abstract
The effect of deformation temperature and strain rate on hot deformation behavior of high nitrogen martensitic stainless steels was investigated by hot compression tests at temperatures of 900 °C–1150 °C and the strain rates of 0.1–10 s−1. Combining with microstructural evolution, the relationship of flow stress with strain rate and deformation temperature was analyzed. The results indicated that the true stress-true strain curves of the experimental material displayed dynamic recrystallization character under the present deformation conditions. The peak stress and flow stress decreased with increasing deformation temperature and increased with increasing strain rate. The thermal deformation activation energy of the experimental steel was 710 038 J · mol−1, and the constitutive equation of the plastic deformation of high nitrogen martensitic stainless steel was obtained by introducing the Zener-Hollomon parameter.
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