预先<strong>Mn</strong>配分对中锰钢中温连续冷却过程中贝氏体相变的影响

doi:10.11900/0412.1961.2025.00219

金属学报

2026, Vol. 62

Issue (3): 477-488 DOI: 10.11900/0412.1961.2025.00219

研究论文

本期目录 | 过刊浏览

预先Mn配分对中锰钢中温连续冷却过程中贝氏体相变的影响

郑沁园¹^,², 刘朋¹, 路轶¹^,², 朱海龙¹^,², 郑成武¹^,²(

), 栾义坤¹, 李殿中¹^,²(

)

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Effect of Mn Pre-Partitioning on Bainite Transformation During Medium-Temperature Continuous Cooling of Medium Mn Steel

ZHENG Qinyuan¹^,², LIU Peng¹, LU Yi¹^,², ZHU Hailong¹^,², ZHENG Chengwu¹^,²(

), LUAN Yikun¹, LI Dianzhong¹^,²(

)

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

郑沁园, 刘朋, 路轶, 朱海龙, 郑成武, 栾义坤, 李殿中. 预先Mn配分对中锰钢中温连续冷却过程中贝氏体相变的影响[J]. 金属学报, 2026, 62(3): 477-488.
Qinyuan ZHENG, Peng LIU, Yi LU, Hailong ZHU, Chengwu ZHENG, Yikun LUAN, Dianzhong LI. Effect of Mn Pre-Partitioning on Bainite Transformation During Medium-Temperature Continuous Cooling of Medium Mn Steel[J]. Acta Metall Sin, 2026, 62(3): 477-488.

全文: PDF(3925 KB) HTML

摘要:

为探究基于中温连续冷却工艺制备高强塑性中锰钢的可行性，以0.2C-3Mn-1.5Si (质量分数，%)中锰钢为研究对象，利用SEM、EBSD等表征手段和力学性能测试方法，研究了预先Mn配分对低Mn含量中锰钢中温连续冷却贝氏体相变及残余奥氏体体积分数的影响机理。结果表明，利用中温连续冷却过程中发生的无碳化物贝氏体相变可在中锰钢中获取残余奥氏体。通过在临界区预先进行Mn配分处理，可获得层片状富Mn奥氏体。在后续中温连续冷却过程中，贝氏体相变被限制在过冷奥氏体层片内发生，获得由薄膜状残余奥氏体、贝氏体铁素体和临界铁素体组成的多相细晶组织。通过预先Mn配分中的Mn富集和贝氏体相变中C富集的作用，大幅提升了低Mn含量中锰钢中残余奥氏体的体积分数，同时提高了中锰钢的强塑性。

关键词 ：中锰钢, 无碳化物贝氏体, Mn配分, 残余奥氏体, TRIP效应

Abstract：

In the development of third-generation advanced high-strength steels, achieving a balance between strength and ductility while minimizing alloying and production costs is critical. Among the promising candidates, medium Mn steels (MMnS) have the desired design flexibility for achieving a certain amount of metastable austenite, thereby exhibiting an enhanced transformation-induced plasticity (TRIP) effect. Owing to the weakened alloying effect in low-Mn content MMnS, more efforts should be devoted to enhancing the stability of austenite during intercritical annealing. This study explores the possibility of developing high-strength, high-ductile MMnS via continuous cooling from medium temperatures. A 0.2C-3Mn-1.5Si (mass fraction, %) MMnS was selected to analyze the influence of Mn pre-partitioning on bainite transformation and the volume fraction of retained austenite in low-Mn content MMnS using various characterization methods, including SEM and EBSD, as well as mechanical property testing methods. The results indicate that the carbide-free bainite transformation occurring during the medium-temperature continuous cooling enables the acquisition of retained austenite in MMnS. Mn-rich austenite lamellae can be initially produced via Mn pre-partition during intercritical annealing. Subsequently, bainite transformation is restricted to occur within the undercooled austenite lamellae in the medium-temperature continuous cooling process, resulting in a refined multiphase microstructure comprising film-like retained austenite, bainitic ferrite, and intercritical ferrite. The volume fraction of retained austenite in low-Mn content MMnS substantially increases because of the enrichments of Mn and C from Mn pre-partition and bainite transformation, respectively, thereby enhancing the strength and ductility of MMnS.

Key words： medium Mn steel carbide-free bainite Mn partition retained austenite TRIP effect

收稿日期: 2025-08-02

ZTFLH:

TG142

基金资助:国家自然科学基金项目(52321001);国家自然科学基金项目(52071322)

通讯作者: 郑成武，cwzheng@imr.ac.cn，主要从事先进钢铁微观组织与相变机理研究;
李殿中，dzli@imr.ac.cn，主要从事高端装备用金属材料与加工技术研究

Corresponding author: ZHENG Chengwu, professor, Tel: (024)23971973, E-mail: cwzheng@imr.ac.cn;
LI Dianzhong, professor, Tel: (024)23971281, E-mail: dzli@imr.ac.cn

作者简介: 郑沁园，女，1997年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2025.00219 或 https://www.ams.org.cn/CN/Y2026/V62/I3/477

图1 中锰钢中温连续冷却过程的示意图

Sample	Process	Pre-annealing process	CB
			T_s / ^oC	$C ˙$ / (^oC·s^-1)
PA-CB400-0.05	PA	Annealing at 850 ^oC for 10 min	400	0.05
PI-CB370-0.05	PI	Annealing at 780 ^oC for 10 min	370	0.05
PI-CB430-0.05			430	0.05
PI-CB400-0.05			400	0.05
PI-CB400-0.1			400	0.1
PI-CB400-0.2			400	0.2

表1 不同预退火和中温连续冷却条件处理的0.2C-3Mn-1.5Si中锰钢试样

图2 奥氏体化预退火0.2C-3Mn-1.5Si中锰钢在中温连续冷却处理时的热膨胀曲线和微观组织的SEM像、EBSD像和Mn元素分布图

图3 奥氏体化预退火0.2C-3Mn-1.5Si中锰钢在中温连续冷却过程中冷却至395、390和370 ℃时微观组织的SEM像和EBSD像

图4 临界区预退火0.2C-3Mn-1.5Si中锰钢在中温连续冷却处理时的热膨胀曲线，临界区预退火后和中温连续冷却处理后微观组织的SEM像、EBSD像和Mn元素分布

图5 临界区预退火0.2C-3Mn-1.5Si中锰钢在中温连续冷却过程中冷却至395、390和370 ℃时微观组织的SEM像和EBSD像

图6 不同温度预退火处理后中温连续冷却0.2C-3Mn-1.5Si中锰钢的工程应力-应变曲线和加工硬化曲线

图7 不同起始冷却温度下0.2C-3Mn-1.5Si中锰钢连续冷却时的热膨胀曲线、XRD谱和残余奥氏体体积分数

图8 以不同起始冷却温度连续冷却0.2C-3Mn-1.5Si中锰钢的工程应力-应变曲线和力学性能

图9 不同冷却速率下0.2C-3Mn-1.5Si中锰钢在中温连续冷却时的热膨胀曲线、XRD谱和残余奥氏体体积分数

图10 中锰钢中温连续冷却过程中发生无碳化物贝氏体相变的示意图

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