Fe-Mn-Al-C系低密度钢中κ-碳化物研究进展

doi:10.13251/j.issn.0254-6051.2025.01.003

摘要/Abstract

摘要： 作为新一代汽车用钢,Fe-Mn-Al-C系低密度钢因其强度高、密度低、塑韧性良好等优点,是未来汽车轻量化研究的潜力材料。κ-碳化物会影响钢材的综合力学性能,因此本文详细阐述了Fe-Mn-Al-C系低密度钢中κ-碳化物特征及形成机理、合金元素含量差异对κ-碳化物的影响、固溶时效处理对κ-碳化物的影响以及κ-碳化物对强韧化机制的影响,认为应合理控制Fe-Mn-Al-C钢中Al、Mn的质量分数,为κ-碳化物析出提供驱动力,固溶时间以900~1100 ℃为宜,之后在450~600 ℃之间进行时效,时效时间以1~2 h为宜,避免在晶界处析出粗大的κ-碳化物恶化材料性能。

关键词: Fe-Mn-Al-C低密度钢, κ-碳化物, 合金元素, 热处理

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

中图分类号:

TG142.1

李昌昊, 刘智, 章小峰, 杨永, 周华生, 赵鑫磊. Fe-Mn-Al-C系低密度钢中κ-碳化物研究进展[J]. 金属热处理, 2025, 50(1): 22-30.

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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