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摘要
Austenite deformation can affect the transformation kinetics and microstructure of alloy steels. The factors influencing the stress-strain of austenite during deformation are complex, involving deformation temperature, strain rate, and strain-induced phase transformation. This research investigated the compression deformation behavior of 0. 38C-1. 44Si-0. 82Mn-0. 9Cr-0. 25Mo-0. 078V steel using Gleeble3500 thermal simulator. The variation of stress-strain at different deformation temperatures and the microstructure of deformed compressed specimens were studied. Results show that with the increase in deformation temperature, the stress gradually decreased. When the deformation temperature was 400 °C, the undercooled austenite deformation induced phase transformation and produced rod-like microstructure, which resulted in a sharp increase in stress with strain, indicating a more obvious work-hardening phenomenon than other high temperature deformations. In addition, the existing Medina model and Eres-Castellanos model were modified by adding fitting parameters, and the yield strength of the experimental steel was calculated by using the modified model. Results show that the predicted yield strength was basically consistent with the actual yield strength. The yield strength prediction model of austenite of the experimental steel was established, which can provide guidance for austenite deformation process. ? 2023 Harbin Institute of Technology.
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