淬火工艺对28MnCrMoRE油井管钢显微组织及硬度的影响

doi:10.13251/j.issn.0254-6051.2024.08.027

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 160-164.DOI: 10.13251/j.issn.0254-6051.2024.08.027

淬火工艺对28MnCrMoRE油井管钢显微组织及硬度的影响

孙昭琦¹, 李涛¹, 韩强¹, 张行刚², 白岩松¹, 高志敏¹

1.内蒙古科技大学材料与冶金学院, 内蒙古包头 014010;
2.内蒙古包钢钢联股份有限公司, 内蒙古包头 014010

收稿日期:2024-02-09 修回日期:2024-06-15 出版日期:2024-08-25 发布日期:2024-09-27
通讯作者: 李涛,教授,博士,E-mail:836450192@qq.com
作者简介:孙昭琦(1998—),男,硕士研究生,主要研究方向为先进钢铁材料的相变,E-mail:sunzhaoqi2022@163.com。
基金资助:
内蒙古自治区科技计划(2020GG0207);内蒙古自然科学基金(2021LHMS05028)

Effect of quenching process on microstructure and hardness of 28MnCrMoRE oil well pipe steel

Sun Zhaoqi¹, Li Tao¹, Han Qiang¹, Zhang Xinggang², Bai Yansong¹, Gao Zhimin¹

1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Baogang Steel Federation Co., Ltd., Baotou Inner Mongolia 014010, China

Received:2024-02-09 Revised:2024-06-15 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 以28MnCrMoRE钢油井管钢为研究对象,探究淬火工艺对深井油井管显微组织及硬度的影响。采用金相显微镜对淬火后原奥氏体晶粒进行观察,通过Image-ProPlus软件对原始奥氏体晶粒度进行统计;利用扫描电镜对淬火后的微观组织进行了观察及分析;利用洛氏硬度计进行硬度测试。结果表明,28MnCrMoRE钢分别经870、900、930 ℃保温30 min水淬后,原始奥氏体晶粒平均尺寸随淬火温度上升由8.21 μm增大到12.67 μm。当淬火温度为900 ℃,试验钢在保温90 min时原始奥氏体晶粒发生明显的异常长大;保温30 min时,原始奥氏体晶粒相对细小均匀且尺寸符合正态分布。28MnCrMoRE钢淬火组织为马氏体+贝氏体+残留奥氏体。随着淬火温度的升高或保温时间的延长,马氏体含量逐渐减少,组织有一定的粗化,试验钢的硬度先上升后下降,最大值为53.02 HRC。

关键词: 28MnCrMoRE钢, 油井管, 淬火工艺, 显微组织, 硬度

Abstract: Taking 28MnCrMoRE steel oil well pipe as the research object, the effect of quenching process on microstructure and hardness of deep well oil well pipe was explored. The prior austenite grains after quenching were observed by using metallographic microscope, and the prior austenite grain size was obtained by Image-ProPlus software. The microstructure after quenching was observed and analyzed by using SEM. The hardness was measured by using Rockwell hardness tester. The results show that the average size of prior austenite grains increases from 8.21 μm to 12.67 μm in the 28MnCrMoRE steel after holding at 870, 900 and 930 ℃, respectively, for 30 min then water quenching. When quenched at 900 ℃ for 90 min, there is a significant abnormal growth of the prior austenite grains, when held for 30 min, the prior austenite grains in the tested steel are relatively small and uniform, and the grain size conforms to a normal distribution. The quenched microstructure of the 28MnCrMoRE steel is martensite + bainite + retained austenite. With the increase of quenching temperature or the extension of holding time, the content of martensite gradually decreases, the microstructure has a certain degree of coarsening, and the hardness of the tested steel first increases and then decreases, with a maximum value being 53.02 HRC.

Key words: 28MnCrMoRE steel, oil well pipe, quenching process, microstructure, hardness

中图分类号:

TG156.31

孙昭琦, 李涛, 韩强, 张行刚, 白岩松, 高志敏. 淬火工艺对28MnCrMoRE油井管钢显微组织及硬度的影响[J]. 金属热处理, 2024, 49(8): 160-164.

Sun Zhaoqi, Li Tao, Han Qiang, Zhang Xinggang, Bai Yansong, Gao Zhimin. Effect of quenching process on microstructure and hardness of 28MnCrMoRE oil well pipe steel[J]. Heat Treatment of Metals, 2024, 49(8): 160-164.

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淬火工艺对28MnCrMoRE油井管钢显微组织及硬度的影响

Effect of quenching process on microstructure and hardness of 28MnCrMoRE oil well pipe steel

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