等温淬火温度对50CrVA钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.03.005

金属热处理 ›› 2024, Vol. 49 ›› Issue (3): 28-32.DOI: 10.13251/j.issn.0254-6051.2024.03.005

等温淬火温度对50CrVA钢组织与性能的影响

张禹¹, 于金瑞¹, 于鑫泓¹, 冯以盛^1,2, 张云山², 赵而团^1,2

1.山东理工大学机械工程学院, 山东淄博 255049;
2.山东星泉科技有限公司, 山东淄博 255049

收稿日期:2023-09-01 修回日期:2024-01-08 出版日期:2024-03-25 发布日期:2024-04-24
通讯作者: 赵而团,副教授,博士,E-mail: etzhao@sdut.edu.cn
作者简介:张禹(1995—),男,硕士,主要研究方向为贝氏体钢弹簧组织性能,E-mail: zy17836073211@163.com。
基金资助:
山东省自然科学基金(ZR2022ME210);山东省精密制造与特种加工重点实验室基金(9001/5322009)

Effect of austempering temperature on microstructure and properties of 50CrVA steel

Zhang Yu¹, Yu Jinrui¹, Yu Xinhong¹, Feng Yisheng^1,2, Zhang Yunshan², Zhao Ertuan^1,2

1. School of Mechanical Engineering, Shandong University of Technology, Zibo Shandong 255049, China;
2. Star Spring Technology Co., Ltd., Zibo Shandong 255049, China

Received:2023-09-01 Revised:2024-01-08 Online:2024-03-25 Published:2024-04-24

摘要/Abstract

摘要： 以传统弹簧钢50CrVA为研究对象,通过水雾+空冷快速冷却后在350、400、450 ℃炉内等温淬火的方式,实现贝氏体转变。利用热模拟、SEM、XRD、拉伸和冲击试验研究了等温淬火温度对50CrVA钢组织与性能的影响。结果表明,随着等温淬火温度的升高,贝氏体转变速度先升高后降低,400 ℃时转变速度最快。350 ℃与400 ℃等温过程贝氏体转变量相同,且高于450 ℃等温条件下贝氏体转变量。这是由于碳化物的析出使过冷奥氏体中碳含量降低,贝氏体转变完全,从而得到近乎全贝氏体组织。随着等温淬火温度的升高,贝氏体、渗碳体与M/A组织均变得粗大,导致拉伸性能与冲击性能均有明显降低,断裂模式逐渐从准解理断裂变为解理断裂。

关键词: 50CrVA弹簧钢, 贝氏体, 等温淬火温度, 组织演变, 力学性能

Abstract: Traditional spring steel 50CrVA was taken as the research object, and the bainite transformation was realized by austempering at 350, 400, 450 ℃ in the furnace after water mist +air fast cooling. The effect of austempering temperature on microstructure and properties of the 50CrVA steel was studied by means of thermal simulation, SEM, XRD, tensile and impact tests. The results show that the bainite transformation rate first increases and then decreases with the increase of austempering temperature, and the transformation rate is the fastest at 400 ℃. The bainite transformation quantities at 350 ℃ and 400 ℃ are the same and higher than that at 450 ℃, this is due to the precipitation of carbides, which reduces the carbon content in the undercooled austenite, the bainite transformation is completed, thus obtaining full bainite microstructure. With the increase of austempering temperature, the bainite, cementite and M/A structure become coarser, resulting in a significant reduction in tensile and impact properties, and the fracture mode gradually changes from quasi-cleavage fracture to cleavage fracture.

Key words: 50CrVA spring steel, bainite, austempering temperature, microstructure evolution, mechanical properties

中图分类号:

TG142.1

张禹, 于金瑞, 于鑫泓, 冯以盛, 张云山, 赵而团. 等温淬火温度对50CrVA钢组织与性能的影响[J]. 金属热处理, 2024, 49(3): 28-32.

Zhang Yu, Yu Jinrui, Yu Xinhong, Feng Yisheng, Zhang Yunshan, Zhao Ertuan. Effect of austempering temperature on microstructure and properties of 50CrVA steel[J]. Heat Treatment of Metals, 2024, 49(3): 28-32.

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等温淬火温度对50CrVA钢组织与性能的影响

Effect of austempering temperature on microstructure and properties of 50CrVA steel

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