临界区淬火温度对低碳5Mn钢强韧性的影响

doi:10.13251/j.issn.0254-6051.2025.07.039

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 270-276.DOI: 10.13251/j.issn.0254-6051.2025.07.039

临界区淬火温度对低碳5Mn钢强韧性的影响

陈奎¹, 褚曼², 刘宁¹, 陈俊²

1.湖南华菱涟源钢铁有限公司, 湖南娄底 417009;
2.东北大学数字钢铁全国重点实验室, 辽宁沈阳 110004

收稿日期:2025-01-13 修回日期:2025-04-25 出版日期:2025-07-25 发布日期:2025-07-28
作者简介:陈奎(1991—),男,工程师,博士研究生,主要研究方向为超高强钢和高合金钢开发与应用,E-mail:chenkui167@163.com

Effect of intercritical quenching temperature on strength and toughness of low carbon 5Mn steel

Chen Kui¹, Chu Man², Liu Ning¹, Chen Jun²

1. Lianyuan Iron & Steel Co., Ltd., Loudi Hunan 417009, China;
2. State Key Laboratory of Digital Steel, Northeastern University, Shenyang Liaoning 110004, China

Received:2025-01-13 Revised:2025-04-25 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 针对高强钢传统韧化方式的局限性,采用低碳中锰设计引入残留奥氏体作为一种新的韧化方式,同时添加一定量的Cr和Cu等,来改善高强度中厚板的低温韧性和弥补传统韧化手段的不足,同时获得厚度方向组织性能均匀性。试验钢经热轧并在线淬火处理后,研究了临界区淬火温度对试验钢显微组织演变与力学性能的影响。结果表明,热轧态组织为板条马氏体,临界区淬火并回火后的组织为回火马氏体+残留奥氏体+铁素体。当临界区淬火温度由640 ℃升高至720 ℃时,残留奥氏体体积分数从14.30%增加至15.50%,随后逐渐降低至6.51%。经670 ℃×40 min淬火并580 ℃×1 h回火后,试验钢具有较好的综合力学性能,其抗拉强度为930 MPa,屈服强度为719 MPa,断后伸长率为30%,-120 ℃下的冲击吸收能量达192 J。

关键词: 中锰钢, 临界区淬火, 组织演变, 强韧性

Abstract: A low-carbon medium-manganese design via introducing retained austenite as a new toughening way was developed to overcome the limitations of the traditional toughening method of high-strength steel. Meanwhile, a certain amount of Cr, Cu and other elements were added to improve the low-temperature toughness of high-strength medium-thick plates and make up for the deficiencies of traditional toughening methods, and to achieve uniform microstructure and properties along the thickness direction. The effect of intercritical quenching temperature on the evolution of microstructure and mechanical properties of the tested steel was studied after hot-rolling and quenching online. The results show that the microstructure of the hot-rolled state is lath martensite, and the microstructure after intercritical quenching and tempering is tempered martensite, retained austenite and ferrite. When the intercritical quenching temperature rises from 640 ℃ to 720 ℃, the volume fraction of retained austenite increases from 14.30% to 15.50%, and then gradually decreases to 6.51%. After quenching at 670 ℃ for 40 min and tempering at 580 ℃ for 1 h, the tested steel has good comprehensive mechanical properties, with a tensile strength of 930 MPa, a yield strength of 719 MPa, an elongation after fracture of 30%, and an impact absorbed energy of 192 J at -120 ℃.

Key words: medium Mn steel, intercritical quenching, microstructure evolution, strength and toughness

中图分类号:

TG142.1

陈奎, 褚曼, 刘宁, 陈俊. 临界区淬火温度对低碳5Mn钢强韧性的影响[J]. 金属热处理, 2025, 50(7): 270-276.

Chen Kui, Chu Man, Liu Ning, Chen Jun. Effect of intercritical quenching temperature on strength and toughness of low carbon 5Mn steel[J]. Heat Treatment of Metals, 2025, 50(7): 270-276.

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临界区淬火温度对低碳5Mn钢强韧性的影响

Effect of intercritical quenching temperature on strength and toughness of low carbon 5Mn steel

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