Effect of annealing temperature on microstructure and properties of Fe-24.38Mn-0.44C TWIP steel

doi:10.13251/j.issn.0254-6051.2022.02.026

Abstract

Abstract: Evolution of microstructure and mechanical properties of the cold-rolled Fe-24.38Mn-0.44C steel at different annealing temperatures (partial recrystallization annealing, recrystallization annealing and high temperature annealing) was studied by means of OM, TEM and tensile test at room temperature. The results show that with the decrease of annealing temperature, the microstructure of the tested steel changes from the coarse undistorted equiaxed recrystallized grains to the mixture structure of nano deformed twins and fine recrystallized grains. The strengthening mechanism gradually changes from twin slip to dislocation slip, supplemented by nano twin strengthening, which leads to a rapid increase of yield strength, an increase of yield ratio from 0.36 to 0.49 and a decrease of elongation.

Key words: twinning induced plasticity(TWIP), annealing temperature, grain size, strengthening mechanism

CLC Number:

TG142.13

Dai Yongjuan, Wu Xiangxiang, Li Jiakun, Guo Dong, Wang Bo. Effect of annealing temperature on microstructure and properties of Fe-24.38Mn-0.44C TWIP steel[J]. Heat Treatment of Metals, 2022, 47(2): 146-152.

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