含硼弹簧钢60Si2Mn的淬透性及其CCT曲线

doi:10.13251/j.issn.0254-6051.2022.12.023

金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 132-137.DOI: 10.13251/j.issn.0254-6051.2022.12.023

含硼弹簧钢60Si2Mn的淬透性及其CCT曲线

卢新春¹, 罗贻正², 王艳林³

1.北京科技大学冶金与生态工程学院,北京 100083;
2.方大特钢科技股份有限公司, 江西南昌 330012;
3.北京科技大学材料科学与工程学院, 北京 100083

收稿日期:2022-08-01 修回日期:2022-10-20 出版日期:2022-12-25 发布日期:2023-01-05
通讯作者: 王艳林,副教授,博士,E-mail: wangyanlin921@ustb.edu.cn
作者简介:卢新春(1973—),男,教授级高级工程师,博士研究生,主要研究方向为钢铁材料质量控制、生产工艺研究及新品开发,E-mail:ngxch@163.com。
基金资助:
国家自然科学基金面上项目(52071012);中央引导地方科技发展基础研究(YDZX2021005);江西省主要学科学术和技术带头人计划(20182BCB22020)

Hardenability of B containing spring steel 60Si2Mn and its CCT curves

Lu Xinchun¹, Luo Yizheng², Wang Yanlin³

1. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Fangda Special Steel Technology Co., Ltd., Nanchang Jiangxi 330012, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2022-08-01 Revised:2022-10-20 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

摘要： 对不同硼含量(0.0005%~0.0047%)弹簧钢60Si2Mn进行端淬试验,研究硼元素对弹簧钢60Si2Mn淬透性的影响,并对0.0026%B弹簧钢60Si2Mn的CCT曲线进行理论计算及试验测定。结果表明,添加硼元素后可提高弹簧钢60Si2Mn的淬透性,当硼含量由0.0005%提高到0.0026%时,弹簧钢60Si2Mn的淬透性明显提高,但当硼含量达到0.0047%时,相较于0.0026%硼含量,淬透性有所下降;理论计算所得静态CCT曲线表明,轧后冷却过程中在300~400 ℃时将会出现贝氏体组织转变,导致弹簧钢的硬度偏高,影响轧材质量;动态CCT曲线结果表明,当冷却速率小于9 ℃/s时,钢中有铁素体析出和珠光体转变;冷速大于10 ℃/s时,钢中只有马氏体转变。

关键词: 硼, 弹簧钢60Si2Mn, 淬透性, CCT曲线

Abstract: End quenching test of spring steel 60Si2Mn with different B content (0.0005%-0.0047%) was carried out to study the effect of B on hardenability of the spring steel 60Si2Mn, and the theoretical calculation and experimental measurement of the CCT curves of 0.0026%B spring steel 60Si2Mn were carried out. The results show that the hardenability of the spring steel 60Si2Mn can be improved by adding B. When the B content is increased from 0.0005% to 0.0026%, the hardenability of the spring steel 60Si2Mn is significantly improved, but when the B content reaches 0.0047%, the hardenability is reduced compared with 0.0026%B content. The static CCT curves obtained by theoretical calculation show that the bainite transformation will occur during the cooling process after rolling at 300-400 ℃, which leads to higher hardness of the steel and affects the quality of rolled final products. The results of dynamic CCT curves show that when the cooling rate is less than 9 ℃/s, there are ferrite precipitation and pearlite transformation in the steel. When the cooling rate is greater than 10 ℃/s, there is only martensite transformation.

Key words: boron, spring steel 60Si2Mn, hardenability, CCT curves

中图分类号:

TG142.1

卢新春, 罗贻正, 王艳林. 含硼弹簧钢60Si2Mn的淬透性及其CCT曲线[J]. 金属热处理, 2022, 47(12): 132-137.

Lu Xinchun, Luo Yizheng, Wang Yanlin. Hardenability of B containing spring steel 60Si2Mn and its CCT curves[J]. Heat Treatment of Metals, 2022, 47(12): 132-137.

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含硼弹簧钢60Si2Mn的淬透性及其CCT曲线

Hardenability of B containing spring steel 60Si2Mn and its CCT curves

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