一种新型2 GPa级低合金超高强度钢及热处理工艺

doi:10.13251/j.issn.0254-6051.2024.03.028

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 164-167.DOI: 10.13251/j.issn.0254-6051.2024.03.028

一种新型2 GPa级低合金超高强度钢及热处理工艺

于林然, 杨卓越, 苏杰, 丁雅莉, 刘赓

钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2023-09-20 修回日期:2023-12-26 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 刘赓,高级工程师,博士,E-mail:liugeng@nercast.com
作者简介:于林然(1998—),女,硕士研究生,主要研究方向为低合金超高强度钢的组织性能,E-mail:linranyu@126.com。
基金资助:
国家自然科学基金(52101131)

A novel 2 GPa grade low alloy ultra-high strength steel and heat treatment process

Yu Linran, Yang Zhuoyue, Su Jie, Ding Yali, Liu Geng

Research Institute for Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-09-20 Revised:2023-12-26 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 在35CrMnSiA钢基础上适当增加Si含量,并添加少量Mo开发出新的2 GPa级40CrMnSi2Mo低合金超高强度钢,并系统地研究淬火温度(875~950 ℃)、回火温度200~300 ℃对40CrMnSi2Mo钢力学性能的影响。结果表明,较高的马氏体开始转变温度会降低马氏体内形成孪晶亚结构的倾向,是40CrMnSi2Mo钢韧性较高的主要原因。添加少量Mo能有效抑制回火脆性,300 ℃回火冲击吸收能量仅降低7.7%。但是,275 ℃和300 ℃回火降低残留奥氏体量使断裂韧性下降。新型40CrMnSi2Mo低合金钢于950 ℃淬火后,在200 ℃和225 ℃回火得到的试样强度高于2 GPa,断裂韧性在85 MPa·m^1/2以上,其强韧性配合明显优于AISI 4340钢和300M钢,而且低成本的优势使其具有较大的应用前景。

关键词: 2 GPa级超高强度钢, 40CrMnSi2Mo钢, 热处理, 抗拉强度, 断裂韧性

Abstract: A novel low alloy ultra-high strength steel 40CrMnSi2Mo with a 2 GPa grade tensile strength was developed by adding Si and small amount of Mo in the traditional 35CrMnSiA steel. The effects of quenching temperature (875-975 ℃) and tempering temperature (200-300 ℃) on the mechanical properties of the 40CrMnSi2Mo steel were systematically investigated. The results show a higher martensite starting temperature (Ms) decreases the formation tendency of twinning martensite structures, which benefits the toughness of the 40CrMnSi2Mo steel. A small amount of Mo can effectively inhibit the temper brittleness, which makes the impact absorbed energy of the steel tempered at 300 ℃ only decrease 7.7%, while tempering at 275 ℃ and 300 ℃ reduces the retained austenite quantity which leads to the decrease of fracture toughness. In general, a well combination of tensile strength (over 2 GPa) and fracture toughness (over 85 MPa·m^1/2) of the 40CrMnSi2Mo steel can be obtained when the studied steel quenched at 950 ℃ and tempered at 200 ℃ and 225 ℃, which outperform that of AISI 4340 steel and 300M steel. It is expected that this novel low-cost steel has a significant application prospect.

Key words: 2 GPa grade ultra-high strength steel, 40CrMnSi2Mo steel, heat treatment, tensile strength, fracture toughness

中图分类号:

TG142.1

于林然, 杨卓越, 苏杰, 丁雅莉, 刘赓. 一种新型2 GPa级低合金超高强度钢及热处理工艺[J]. 金属热处理, 2024, 49(3): 164-167.

Yu Linran, Yang Zhuoyue, Su Jie, Ding Yali, Liu Geng. A novel 2 GPa grade low alloy ultra-high strength steel and heat treatment process[J]. Heat Treatment of Metals, 2024, 49(3): 164-167.

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一种新型2 GPa级低合金超高强度钢及热处理工艺

A novel 2 GPa grade low alloy ultra-high strength steel and heat treatment process

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