热处理工艺对高压气瓶用34CrMo4钢屈强比的影响

doi:10.13251/j.issn.0254-6051.2020.02.024

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 125-128.DOI: 10.13251/j.issn.0254-6051.2020.02.024

热处理工艺对高压气瓶用34CrMo4钢屈强比的影响

张雨源¹, 杨刚¹, 范俊明², 范国金²

1. 四川大学机械工程学院, 四川成都 610065;
2. 成都格瑞特高压容器有限责任公司, 四川成都 610400

收稿日期:2019-09-13 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 杨刚,教授,博士,联系电话:028-85402279,E-mail:yanggang@scu.edu.cn
作者简介:张雨源(1994—),女,硕士研究生,主要研究方向为高强钢的热处理,E-mail:1464480435@qq.com。

Effect of heat treatment process on yield ratio of 34CrMo4 steel for high pressure gas cylinders

Zhang Yuyuan¹, Yang Gang¹, Fan Junming², Fan Guojin²

1. School of Mechanical Engineering, Sichuan University, Chengdu Sichuan 610065, China;
2. Chengdu Great High Pressure Vessel Co., Ltd., Chengdu Sichuan 610400, China

Received:2019-09-13 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

为了改善高压气瓶用34CrMo4钢屈强比较高的问题,分别研究了调质处理(QT)、在浓度为7.5%PAG水溶性淬火剂中的淬火+回火(Q₁T)、亚温淬火+回火(IT)和淬火+亚温淬火+回火(QIT)4种不同热处理工艺对34CrMo4钢屈强比的影响,以及屈强比与微观组织之间的关系。结果表明:采用QT工艺得到回火索氏体组织,屈强比最高;采用Q₁T工艺得到较粗的回火索氏体组织,屈强比较高;采用IT工艺得到回火索氏体+块状及板条状铁素体两相组织,屈强比较低;采用QIT工艺得到回火索氏体+均匀分布的板条铁素体两相组织,屈强比最低。试样的组织为硬相回火索氏体上分布着软相铁素体时,有较低的屈强比。

关键词: 34CrMo4钢, 屈强比, 热处理, 显微组织, 亚温淬火

Abstract:

In order to adress the higher yield ratio issue of 34CrMo4 steel for high pressure gas cylinders, effect of different heat treating processes including quenching and tempering (QT), quenching in 7.5% PAG aqueous quenchant and tempering (Q₁T), intercritical quenching and tempering (IT) and quenching plus intercritical quenching and tempering (QIT) on yield ratio of the 34CrMo4 steel were investigated, and the relationship between yield ratio and microstructure was also studied. The results show that after QT process, the microstructure of the tested steel consists of sorbite, and the yield ratio is highest. After Q₁T process, the microstructure of the tested steel consists of coarse sorbite, and the yield ratio is higher. After IT process, sorbite with polygonal and lath ferrite as second phase is obtained, and the yield ratio is lower. After QIT process, the microstructure consists of sorbite with even distributed lath ferrite as second phase, and the yield ratio is lowest. Based on the results, the specimen has lower yield ratio when there is a soft phase ferrite distributed on tempered sorbite.

Key words: 34CrMo4 steel, yield ratio, heat treatment, microstructure, intercritical quenching

中图分类号:

TG156

张雨源, 杨刚, 范俊明, 范国金. 热处理工艺对高压气瓶用34CrMo4钢屈强比的影响[J]. 金属热处理, 2020, 45(2): 125-128.

Zhang Yuyuan, Yang Gang, Fan Junming, Fan Guojin. Effect of heat treatment process on yield ratio of 34CrMo4 steel for high pressure gas cylinders[J]. HTM, 2020, 45(2): 125-128.

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热处理工艺对高压气瓶用34CrMo4钢屈强比的影响

Effect of heat treatment process on yield ratio of 34CrMo4 steel for high pressure gas cylinders

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