温度和时间对Fe–28Mn–10Al–0.8C低密度钢中κ-碳化物析出的影响：时效机理及其对材料性能的影响

高喻淋; 张敏; 王瑞; 张欣欣; 谭谆礼; 种晓宇

doi:10.1007/s12613-024-2857-0

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(10): 2189-2198

Yulin Gao, Min Zhang, Rui Wang, Xinxin Zhang, Zhunli Tan, and Xiaoyu Chong, Effect of temperature and time on the precipitation of κ-carbides in Fe–28Mn–10Al–0.8C low-density steels: Aging mechanism and its impact on material properties, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2189-2198. https://doi.org/10.1007/s12613-024-2857-0

Cite this article as:

Yulin Gao, Min Zhang, Rui Wang, Xinxin Zhang, Zhunli Tan, and Xiaoyu Chong, Effect of temperature and time on the precipitation of κ-carbides in Fe–28Mn–10Al–0.8C low-density steels: Aging mechanism and its impact on material properties, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2189-2198. https://doi.org/10.1007/s12613-024-2857-0

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研究论文

温度和时间对Fe–28Mn–10Al–0.8C低密度钢中κ-碳化物析出的影响：时效机理及其对材料性能的影响

1)
北京交通大学材料科学与工程研究中心机械与电子控制工程学院, 北京100044, 中国
2)
昆明理工大学材料科学与工程学院, 昆明650093, 中国

通讯作者:
张敏 E-mail: zhangm@bjtu.edu.cn

文章亮点

(1) 在不同的时效温度和时间下，对Fe–28Mn–10Al–0.8C（wt%）奥氏体低密度钢中κ-碳化物的沉淀序列进行了深入的研究。

(2) 在时效过程中，κ-碳化物显著析出，主要沿着[111]_κ方向生长；

(3) 在时效过程中，球形碳化物作为第二阶段沉淀的过渡阶段或不稳定阶段，逐渐溶解，保证了针状碳化物的逐渐生长和粗化；

(4) 位错强化和第二相强化是其主要的强化机制。

中文摘要

本研究探讨了Fe–28Mn–10Al–0.8C（wt%）低密度钢时效过程中第二相κ-碳化物的演化机理及其对钢性能的影响。在低密度钢中，κ-碳化物主要在奥氏体中以纳米级颗粒的形式析出。然而，它们在铁素体中的析出尚未得到全面的探索，其时效过程中的第二相析出机制尚不清楚。本研究全面分析了κ-碳化物在不同时效温度和时间下的晶体学特征和形态演化，以及这些变化对材料显微硬度的影响。在不同的热处理条件下，晶粒内κ-碳化物表现出不同的形态和晶体学特征，如针状、球形和短棒状。在时效的初始阶段，针状的κ-碳化物为主要析出，并伴有一些球形碳化物。κ-碳化物随着时效时间的演唱而生长和变粗，球形碳化物显著减少，棒状碳化物变粗。维氏硬度试验表明，该材料的硬度受κ-碳化物的体积分数、形貌和尺寸的影响。在较高温度下的长期时效导致碳化物的尺寸和体积分数的增加，从而导致硬度的逐渐上升。在变形过程中，强化的主要机制是位错强化和第二相强化。基于这些发现，提出了提高材料强度的潜在策略。

关键词:

Research Article

Effect of temperature and time on the precipitation of κ-carbides in Fe–28Mn–10Al–0.8C low-density steels: Aging mechanism and its impact on material properties

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Abstract

Abstract

In low-density steel, κ-carbides primarily precipitate in the form of nanoscale particles within austenite grains. However, their precipitation within ferrite matrix grains has not been comprehensively explored, and the second-phase evolution mechanism during aging remains unclear. In this study, the crystallographic characteristics and morphological evolution of κ-carbides in Fe–28Mn–10Al–0.8C (wt%) low-density steel at different aging temperatures and times and the impacts of these changes on the steels’ microhardness and properties were comprehensively analyzed. Under different heat treatment conditions, intragranular κ-carbides exhibited various morphological and crystallographic characteristics, such as acicular, spherical, and short rod-like shapes. At the initial stage of aging, acicular κ-carbides primarily precipitated, accompanied by a few spherical carbides. κ-Carbides grew and coarsened with aging time, the spherical carbides were considerably reduced, and rod-like carbides coarsened. Vickers hardness testing demonstrated that the material’s hardness was affected by the volume fraction, morphology, and size of κ-carbides. Extended aging at higher temperatures led to an increase in carbide size and volume fraction, resulting in a gradual rise in hardness. During deformation, the primary mechanisms for strengthening were dislocation strengthening and second-phase strengthening. Based on these findings, potential strategies for improving material strength are proposed.
- low-density steel;
- κ-carbide;
- solution–aging treatment;
- hardness

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