Fe-Mn-Al-C系轻质钢中含铝碳化物的析出规律

doi:10.13251/j.issn.0254-6051.2022.08.011

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 71-76.DOI: 10.13251/j.issn.0254-6051.2022.08.011

Fe-Mn-Al-C系轻质钢中含铝碳化物的析出规律

孟静竹¹, 刘仁东¹, 郭金宇¹, 徐荣杰¹, 王科强¹, 潘勇²

1.鞍钢集团钢铁研究院, 辽宁鞍山 114001;
2.东北特殊钢集团股份有限公司, 辽宁大连 116105

收稿日期:2022-03-27 修回日期:2022-06-19 出版日期:2022-08-25 发布日期:2022-09-19
作者简介:孟静竹(1990—),女,工程师,硕士,主要研究方向为汽车钢新产品开发,E-mail:564395530@qq.com。

Precipitation law of carbide containing aluminum in Fe-Mn-Al-C lightweight steel

Meng Jingzhu¹, Liu Rendong¹, Guo Jinyu¹, Xu Rongjie¹, Wang Keqiang¹, Pan Yong²

1. Steel Research Institute of Ansteel, Anshan Liaoning 114001, China;
2. Dongbei Special Steel Group Co., Ltd., Dalian Liaoning 116105, China

Received:2022-03-27 Revised:2022-06-19 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

摘要： 通过OM、SEM、XRD、TEM、EPMA、拉伸试验及维氏硬度测试等手段对不同冷却速度和加热温度下Fe-18Mn-0.8C-0.3Si-xAl(x=3, 6, 9)轻质钢中含铝碳化物—K相析出的规律以及其对性能的影响进行了研究。研究发现,影响K相析出的因素有Al含量、冷却速率和加热温度等。在炉冷的情况下,冷却速率约为0.020 ℃/s时,Al含量达到9%以上的轻质钢中K相可以在奥氏体边界上析出;在900 ℃以下K相可以存在,高于900 ℃时,K相就不再析出。析出的K相会对轻质钢的力学性能产生影响,会急剧降低轻质钢的塑性。因此在生产中应避免粗大的K相在钢中析出,采用较快的冷却方式以及较高的加热温度(＞900 ℃)可避免K相的析出。

关键词: Fe-Mn-Al-C轻质钢, 含Al碳化物, 析出规律, 力学性能

Abstract: Precipitation law of aluminous carbide containing aluminum-K phase in the Fe-18Mn-0.8C-0.3Si-xAl(x=3, 6, 9) lightweight steel and its effect on properties under different cooling rates and heating temperatures were investigated by means of OM, SEM, XRD, TEM, EPMA, tensile test and Vickers hardness test. The results show that the factors affecting the precipitation of K phase include Al content, cooling rate and heating temperature. In the case of furnace cooling, when the cooling rate is about 0.020 ℃/s, K phase in lightweight steel with Al content of more than 9% is capable of precipitating on the austenite boundary; K phase is capable of precipitating below 900 ℃, while the heating temperature is higher than 900 ℃, K phase no longer precipitates. The precipitated K phase will affect the mechanical properties of lightweight steel and sharply reduce the plasticity of the lightweight steel. Therefore, the thick K phase should be avoided from precipitation in steel during production, which can be avoided by using faster cooling rate and higher heating temperature(>900 ℃).

Key words: Fe-Mn-Al-C lightweight steel, carbide containing aluminum, precipitation law, mechanical properties

中图分类号:

TG162.83

孟静竹, 刘仁东, 郭金宇, 徐荣杰, 王科强, 潘勇. Fe-Mn-Al-C系轻质钢中含铝碳化物的析出规律[J]. 金属热处理, 2022, 47(8): 71-76.

Meng Jingzhu, Liu Rendong, Guo Jinyu, Xu Rongjie, Wang Keqiang, Pan Yong. Precipitation law of carbide containing aluminum in Fe-Mn-Al-C lightweight steel[J]. Heat Treatment of Metals, 2022, 47(8): 71-76.

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Fe-Mn-Al-C系轻质钢中含铝碳化物的析出规律

Precipitation law of carbide containing aluminum in Fe-Mn-Al-C lightweight steel

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