Q&P工艺对5CrMnNiMo超高强度钢组织及性能的影响

doi:10.13251/j.issn.0254-6051.2022.05.037

金属热处理 ›› 2022, Vol. 47 ›› Issue (5): 217-220.DOI: 10.13251/j.issn.0254-6051.2022.05.037

Q&P工艺对5CrMnNiMo超高强度钢组织及性能的影响

索忠源¹, 杜阳¹, 付立铭², 单爱党²

1.吉林化工学院机电工程学院, 吉林吉林 132022;
2.上海交通大学材料科学与工程学院, 上海 200240

收稿日期:2021-12-16 修回日期:2022-03-21 出版日期:2022-05-25 发布日期:2022-06-16
通讯作者: 单爱党,教授,E-mail: adshan@sjtu.edu.cn
作者简介:索忠源(1979—),男,副教授,博士,主要研究方向为耐热及高强金属的组织与性能,E-mail: zhy_suo@126.com。
基金资助:
吉林省教育厅项目(JJKH20210232KJ);吉林化工学院重大项目(2020020)

Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel

Suo Zhongyuan¹, Du Yang¹, Fu Liming², Shan Aidang²

1. College of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology, Jilin Jilin 132022, China;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2021-12-16 Revised:2022-03-21 Online:2022-05-25 Published:2022-06-16

摘要/Abstract

摘要： 对5CrMnNiMo超高强度钢进行了淬火-配分(Q&P)处理,利用SEM、电子万能试验机、X射线衍射仪、EBSD等试验手段,探讨了试验钢的显微组织和力学性能随Q&P工艺中等温配分5 min、24 h及非等温配分6 h后的变化规律。结果表明,Q&P处理过程中,显微组织均由马氏体+残留奥氏体+少量粒状碳化物组成,随着等温配分时间的延长,残留奥氏体由片状逐渐转变为块状;等温配分5 min后,获得高达2230 MPa的超高抗拉强度,抗拉强度经等温配分24 h后降低到1360 MPa;塑性变形量由等温配分5 min后的3.92%增加到非等温配分6 h后的14.62%,TRIP效应是塑性变形量增加的主要原因。

关键词: Q&P工艺, 超高强度钢, 微观形貌, 力学性能

Abstract: Quenching and partitioning (Q&P) process was performed for 5CrMnNiMo ultra-high strength steel. The changes of microstructure and mechanical properties of the tested steel with isothermal partitioning for 5 min, 24 h and non-isothermal partitioning for 6 h under Q&P process were investigated by means of SEM, electronic universal testing machine, X-ray diffraction and EBSD. The results show that during Q&P treatment, the microstructure is composed of martensite, retained austenite and a small amount of granular carbide. The retained austenite gradually transforms from flake to block with the prolongation of isothermal partitioning time. After isothermal partitioning for 5 min, the ultra-high tensile strength of 2230 MPa is obtained. The tensile strength is decreased to 1360 MPa after isothermal partitioning for 24 h and the plastic deformation is increased from 3.92% (isothermal partitioning time of 5 min) to 14.62% (non-isothermal partitioning time of 6 h). The TRIP effect is the main reason for the increase of plastic deformation.

Key words: Q&P process, ultra-high strength steel, microstructure, mechanical properties

中图分类号:

TG142.1

索忠源, 杜阳, 付立铭, 单爱党. Q&P工艺对5CrMnNiMo超高强度钢组织及性能的影响[J]. 金属热处理, 2022, 47(5): 217-220.

Suo Zhongyuan, Du Yang, Fu Liming, Shan Aidang. Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel[J]. Heat Treatment of Metals, 2022, 47(5): 217-220.

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Q&P工艺对5CrMnNiMo超高强度钢组织及性能的影响

Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel

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