Research progress of κ-carbide in Fe-Mn-Al-C low density steels

doi:10.13251/j.issn.0254-6051.2025.01.003

Abstract

Abstract: As a new generation of automotive steel, the Fe-Mn-Al-C system low-density steel is a potential material for future automotive light-weighting research due to its advantages of high strength, low density, and good plasticity and toughness. As a result of κ-carbide affect the comprehensive mechanical properties of the steel, the characteristics and formation mechanism of κ-carbides in Fe-Mn-Al-C low-density steels and the effect of differences in the content of alloying elements on κ-carbides were expounded, and the effect of solution and aging treatments on κ-carbides and the effect of κ-carbides on the toughening mechanism were described in detail. It is concluded that the mass fraction of Al and Mn in Fe-Mn-Al-C steel should be reasonably controlled to provide driving force for κ-carbide precipitation, and the solution treatment temperature should be 900-1100 ℃, after which the aging should be carried out in the range of 450-600 ℃, and the aging time should be 1-2 h, to avoid the precipitation of coarse κ-carbides at the grain boundaries to deteriorate the material properties.

Key words: Fe-Mn-Al-C low density steel, κ-carbide, alloy elements, heat treatment

CLC Number:

TG142.1

Li Changhao, Liu Zhi, Zhang Xiaofeng, Yang Yong, Zhou Huasheng, Zhao Xinlei. Research progress of κ-carbide in Fe-Mn-Al-C low density steels[J]. Heat Treatment of Metals, 2025, 50(1): 22-30.

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