Hot compression deformation behavior and microstructure evolution of 13Cr super martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2021.03.032

Abstract

Abstract: The hot deformation behavior of 13Cr super martensitic stainless steel was studied by means of Gleeble-3500 thermal simulation mechanical simulator. The single pass compression experiment was conducted with the temperature range of 950-1150 ℃ and the strain rate range of 0.001-10 s^-1. The constitutive equation of flow stress is established based on hyperbolic sine model, and the hot deformation activation energy of the experimental steel is obtained as about 412 kJ/mol. Based on the dynamic material model (DMM) theory, the processing map of the steel is established, from which the optimal ranges of hot deformation temperature and strain rate are determined as 1032-1072 ℃ and 0.039-0.087 s^-1, respectively. The results of microstructure evolution study show that the experimental steel is prone to produce the dynamic recrystallization under high deformation temperature and low strain rate. When the deformation temperature rises from 950 ℃ to 1050 ℃ under 0.01 s^-1 strain rate, the volume of dynamic recrystallization increases from 18.7% to 60.1%, and the recrystallization grains are fine and uniform. When the deformation temperature is 1050 ℃, the dynamically recrystallized grains grow and coarsen with the decrease of strain rate.

Key words: super martensitic stainless steel, hot compression deformation, constitutive equation, electron back-scatter diffraction (EBSD)

CLC Number:

TG142.71

Ji Huiling, Lü Jinyi, Zhang Yiwei, Yang Lei, Yin Yuande. Hot compression deformation behavior and microstructure evolution of 13Cr super martensitic stainless steel[J]. Heat Treatment of Metals, 2021, 46(3): 159-165.

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