Ferrite refinement preparation based on coupling of warm deformation and reversal transformation

doi:10.13251/j.issn.0254-6051.2023.04.006

Abstract

Abstract: Refinements of austenite and ferrite grains in a medium carbon steel were studied by multi-pass warm deformation at 650 ℃ by Gleeble-3500 thermal simulation machine, and characterized by OM, TEM and EBSD. The results show that the 6-passes high strain rate compressive deformation induces austenite reversal transformation, and the mean grain diameter of austenite is 3.4 μm. During cooling down to 600 ℃ at a rate of 10 ℃/s, the ferrite with mean grain diameter of about 0.64 μm is formed from the reversed austenite, and the cementite particles are distributed in the ferrite matrix.

Key words: medium carbon steel, warm deformation, reversal transformation induced by deformation, grain refinement, spheroidized cementite

CLC Number:

TG156.1

Wang Zhihao, Li Hongbin, Liu Litao. Ferrite refinement preparation based on coupling of warm deformation and reversal transformation[J]. Heat Treatment of Metals, 2023, 48(4): 35-39.

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