Mn-Cr-V-S贝氏体非调质钢连续冷却转变与组织调控

doi:10.13251/j.issn.0254-6051.2023.09.032

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 191-196.DOI: 10.13251/j.issn.0254-6051.2023.09.032

Mn-Cr-V-S贝氏体非调质钢连续冷却转变与组织调控

王芝林^1,2, 高星³, 蒋波^2,3, 王磊英^1,2, 赵海东^1,2, 吴瀚^1,2

1.青海西钢特殊钢科技开发有限公司, 青海西宁 810005;
2.西宁特殊钢股份有限公司, 青海西宁 810005;
3.北京科技大学材料科学与工程学院, 北京 100083

收稿日期:2023-03-29 修回日期:2023-07-07 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 蒋波,副教授,博士,E-mail:jiangbo@ustb.edu.cn
作者简介:王芝林(1983—),男,高级工程师,主要研究方向为特殊钢品种研发,E-mail: 106122099@qq.com。
基金资助:
青海省重点研发与转化计化项目资助(2021-GX-C09)

Continuous cooling transformation and microstructure control of a Mn-Cr-V-S bainitic non-quenched and tempered steel

Wang Zhilin^1,2, Gao Xing³, Jiang Bo^2,3, Wang Leiying^1,2, Zhao Haidong^1,2, Wu Han^1,2

1. Qinghai Xigang Special Steel Science and Technology Development Co., Ltd., Xining Qinghai 810005, China;
2. Xining Special Steel Co., Ltd., Xining Qinghai 810005, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2023-03-29 Revised:2023-07-07 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 利用Gleeble-3800热模拟试验机研究了Mn-Cr-V-S贝氏体非调质钢的连续冷却转变行为,分析了冷却速率对CCT曲线、显微组织和显微硬度的影响,并设置了分段冷却工艺,进行组织调控。结果表明,随着冷却速率的提高,Mn-Cr-V-S贝氏体非调质钢依次发生铁素体+珠光体、铁素体+珠光体+贝氏体、铁素体+贝氏体、铁素体+贝氏体+马氏体和铁素体+马氏体转变;当冷却速率为1 ℃/s时,钢中贝氏体含量较高,面积分数为67%,且组织均匀性较好。当冷却速率高于1.5 ℃/s时,钢中开始出现马氏体组织。为了降低轧材中的铁素体含量、提高贝氏体含量,建议采取分段冷却方式,冷却工艺为:终轧后以5 ℃/s冷至550 ℃,随后以1 ℃/s冷却至室温,此时试验钢的组织均匀性较好,贝氏体含量可达86.8%。

关键词: 贝氏体非调质钢, 连续冷却转变, 组织, 性能

Abstract: Continuous cooling transformation behavior of a Mn-Cr-V-S bainitic non-quenched and tempered steel was studied by using Gleeble-3800 thermal simulation test machine. The effect of cooling rate on the continuous cooling transformation curves, microstructure and micro-hardness of the steel was analyzed. In addition, the step-cooling process was set up to control microstructure for the tested steel. The results show that ferrite+pearlite, ferrite+pearlite+bainite, ferrite+bainite, ferrite+bainite+martensite, and ferrite+martensite transformations occur successively in the Mn-Cr-V-S bainitic non-quenched and tempered steel with the increase of cooling rate. When the cooling rate is 1 ℃/s, the area fraction of bainite in the tested steel is the highest and reaches 68%, and the microstructure uniformity is preferable. When the cooling rate is higher than 1.5 ℃/s, the martensite begins to appear in the steel. In order to reduce the content of ferrite and increase the content of bainite, the step-cooling process is adopted. When the cooling process is final rolling cooled to 550 ℃ at 5 ℃/s, followed by 1 ℃/s to room temperature, the uniformity of microstructure of the tested steel is the best, and the content of bainite can reach 86.8%.

Key words: bainitic non-quenched and tempered steel, continuous cooling transformation, microstructure, properties

中图分类号:

TG142.1

王芝林, 高星, 蒋波, 王磊英, 赵海东, 吴瀚. Mn-Cr-V-S贝氏体非调质钢连续冷却转变与组织调控[J]. 金属热处理, 2023, 48(9): 191-196.

Wang Zhilin, Gao Xing, Jiang Bo, Wang Leiying, Zhao Haidong, Wu Han. Continuous cooling transformation and microstructure control of a Mn-Cr-V-S bainitic non-quenched and tempered steel[J]. Heat Treatment of Metals, 2023, 48(9): 191-196.

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Mn-Cr-V-S贝氏体非调质钢连续冷却转变与组织调控

Continuous cooling transformation and microstructure control of a Mn-Cr-V-S bainitic non-quenched and tempered steel

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