40CrNi3MoV钢残留奥氏体的回火转变及其对力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.10.002

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 10-16.DOI: 10.13251/j.issn.0254-6051.2025.10.002

40CrNi3MoV钢残留奥氏体的回火转变及其对力学性能的影响

段飞鹏¹, 满达¹, 李玮², 刘晓辰¹, 孙玉晓¹, 金自力^1,3

1.内蒙古科技大学材料科学与工程学院, 内蒙古包头 014010;
2.内蒙古科技大学分析测试中心, 内蒙古包头 014010;
3.内蒙古自治区新金属材料重点实验室, 内蒙古包头 014010

收稿日期:2025-05-06 修回日期:2025-08-18 出版日期:2025-10-25 发布日期:2025-11-04
通讯作者: 金自力,教授,硕士生导师,E-mail: jinzl6310@126.com
作者简介:段飞鹏(1999—),男,硕士研究生,主要研究方向为高强度中合金钢的组织与性能,E-mail: duanfp9902@163.com。
基金资助:
军民融合产业发展转移支付专项基金产业示范引导项目(JMRHZX20210009);2023年度内蒙古自治区直属高校基本科研项目(2023RCTD003);2022年度内蒙古自治区直属高校基本科研项目(0406082201)

Transformation of retained austenite during tempering and its effect on mechanical properties of 40CrNi3MoV steel

Duan Feipeng¹, Man Da¹, Li Wei², Liu Xiaochen¹, Sun Yuxiao¹, Jin Zili^1,3

1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Analysis and Testing Center, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
3. Inner Mongolia Key Laboratory of New Metal Materials, Baotou Inner Mongolia 014010, China

Received:2025-05-06 Revised:2025-08-18 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 以国内某钢厂锻后退火态40CrNi3MoV钢为研究对象,采用直接淬火与等温淬火(低于Ms=264 ℃等温)两种淬火方式,利用扫描电镜、透射电镜、X射线衍射仪、拉伸和冲击试验机研究淬火组织中的残留奥氏体对540 ℃回火后的显微组织和力学性能的影响。结果表明:直接淬火试样中残留奥氏体体积分数低于XRD检测下限(<5%),而等温淬火试样为6.2%,且组织中存在两种类型的残留奥氏体,分别为块状残留奥氏体和薄膜状残留奥氏体。块状残留奥氏体分布在原奥氏体晶界和马氏体包界面,宽度约为160 nm;薄膜状残留奥氏体分布在马氏体板条界面,宽度约为20 nm。540 ℃回火后的等温淬火试样中大部分块状残留奥氏体以及少量薄膜状残留奥氏体发生转变,未转变块状残留奥氏体中碳元素富集,不稳定的残留奥氏体在540 ℃回火后发生马氏体转变,使冲击性能显著下降。

关键词: 高强钢, 等温淬火, 微观组织, 残留奥氏体, 力学性能

Abstract: Taking the forged and annealed 40CrNi3MoV steel from a domestic steel plant as the research object, two quenching methods as direct quenching and isothermal quenching (isothermal below Ms=264 ℃) were adopted. The effect of retained austenite in the quenched microstructure on the microstructure and mechanical properties after tempering at 540 ℃ was studied by using scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), tensile testing machine and impact testing machine. The results show that the volume fraction of retained austenite in the direct quenched specimens is below the detection limit of X-ray diffractometer (<5%), while it is 6.2% in the isothermal quenched specimens. Moreover, There are two types of retained austenite in the isothermal quenched microstructure, which are blocky retained austenite and film-like retained austenite. Among them, the blocky retained austenite is distributed at the prior austenite grain boundaries and martensite packet interfaces, with a width of approximately 160 nm, the film-like retained austenite is distributed at the martensite lath interfaces, with a width of about 20 nm. After tempering at 540 ℃, most of the blocky retained austenite and a small amount of film-like retained austenite in the isothermal quenched specimens undergo transformation. Carbon element enriches in the untransformed blocky retained austenite, and the martensitic transformation of unstable retained austenite after tempering at 540 ℃ leads to a significant decrease in the impact property.

Key words: high-strength steel, isothermal quenching, microstructure, retained austenite, mechanical properties

中图分类号:

TG156.5

段飞鹏, 满达, 李玮, 刘晓辰, 孙玉晓, 金自力. 40CrNi3MoV钢残留奥氏体的回火转变及其对力学性能的影响[J]. 金属热处理, 2025, 50(10): 10-16.

Duan Feipeng, Man Da, Li Wei, Liu Xiaochen, Sun Yuxiao, Jin Zili. Transformation of retained austenite during tempering and its effect on mechanical properties of 40CrNi3MoV steel[J]. Heat Treatment of Metals, 2025, 50(10): 10-16.

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40CrNi3MoV钢残留奥氏体的回火转变及其对力学性能的影响

Transformation of retained austenite during tempering and its effect on mechanical properties of 40CrNi3MoV steel

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