合金元素及时效处理对Fe-Mn-Al-C低密度钢中κ-碳化物的影响特性综述

doi:10.11896/cldb.19030026

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Abstract Owing to the characteristics of low-density and excellent mechanical properties, Fe-Mn-Al-C low-density steels have broad application prospects in the field of automotive structural materials. Kappa-carbide,as the main precipitate phase in Fe-Mn-Al-C low-density steels, its precipitation hardening effect is the most significant strengthening mechanism in optimizing the mechanical properties of Fe-Mn-Al-C low-density steels.
However, different precipitation morphology characteristics and locations of kappa-carbides present different effects on the performance and mechanism of Fe-Mn-Al-C low-density steels, and the morphological characteristics of kappa-carbides are easily affected by alloy element composition and heat treatment conditions of low density steels. Therefore,considerable endeavors have been made aiming at the formation mechanism and morphological characteristics of kappa-carbides in Fe-Mn-Al-C low-density steels through decades, and some results have been achieved.
The results show that the formation mechanism of kappa-carbide in Fe-Mn-Al-C low-density steels is spinodal decomposition plus ordering reaction. The increase of Al content in low-density steels is beneficial to the precipitation and growth of kappa-carbide. The influence of Mn content on the precipitation of kappa-carbide in austenitic Fe-Mn-Al-C steels is relatively poor, inhibiting the precipitation of kappa-carbide in duplex Fe-Mn-Al-C steels obviously. Fine disperse kappa-carbides are well distributed in the austenite matrix of Fe-Mn-Al-C low-density steels at ageing temperatures of 400 ℃ to 650 ℃,while coarse kappa-carbides precipitate in the austenite or two-phase grain boundaries in a lamellar form at higher temperatures of 650—750 ℃. The effect of kappa-carbide on the mechanical properties of Fe-Mn-Al-C steels, with its dual nature, can both streng-then in fine intragranular form, and cause the loss of ductility and toughness in coarse intergranular form.
Based on the related research at home and abroad,this paper reviews the influence factors of formation mechanism and structure characteristics of kappa-carbide in Fe-Mn-Al-C low-density steels as well as the influential rules of structure characteristics of kappa-carbide on the morphological characteristics of Fe-Mn-Al-C low-density steels. The methods of controlling morphological characteristics of kappa-carbides in Fe-Mn-Al-C low-density steels are concluded and prospected that, the mass fraction of Al element in Fe-Mn-Al-C steels should be controlled between 7% and 10% to provide driving force for kappa-carbide precipitation, with the aging treatment temperature between 550—650 ℃ and the aging time less than 1 hour to avoid the formation of coarse kappa-carbides to damage the properties of low density steels. Moreover, a new process to restrain the formation of coarse kappa-carbide by adding strong carbide forming elements to Fe-Mn-Al-C low-density steels is prospected.

Key words： Fe-Mn-Al-C low density steel kappa-carbide spinodal decomposition ordering aging

Published: 13 May 2020

CLC number:

TG142.1

Fund:This work was financially supported by the National Natural Science Foundation of China (51974129), the Graduate Student Innovation Fund of North China University of Science and Technology (2018B21).

About author:: Tao Ma received his master degree in metallurgical engineering from North China University of Science and Technology in 2016. He is currently pursuing his Ph.D. at the College of Metallurgy and Energy, North China University of Science and Technology under the supervision of Prof. Yungang Li. His research has focused on the optimization of structure-property of low density steel.
Yungang Li received his B.E and M.E. degree in non-ferrous metallurgy from Northeastern University in 1982 and 1985, and received his Ph.D. degree in physical chemistry in metallurgy from Northeastern University, in 2005. His research focus on theory and technology of metallurgical process, as well as the research of new metal materials and utilization of resources. Dr.Li have undertaken 6 projects of the National Natural Science Foundation of China and published about 130 research papers in international and leading domestic journals in metallic materials science.

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Cite this article:

MA Tao,LI Huirong,GAO Jianxin, et al. Effect of Alloying Elements and Aging Treatment on the Properties of Kappa-Carbide in Fe-Mn-Al-C Low Density Steels: a Review[J]. Materials Reports, 2020, 34(11): 11153-11161.

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http://www.mater-rep.com/EN/10.11896/cldb.19030026 OR http://www.mater-rep.com/EN/Y2020/V34/I11/11153

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