连续屈服、高强屈比中锰钢的工艺设计与组织调控

doi:10.11900/0412.1961.2022.00498

金属学报

2024, Vol. 60

Issue (4): 443-452 DOI: 10.11900/0412.1961.2022.00498

研究论文

本期目录 | 过刊浏览

连续屈服、高强屈比中锰钢的工艺设计与组织调控

张光莹¹, 李岩²^,³, 黄丽颖⁴, 定巍¹(

)

1 内蒙古科技大学材料与冶金学院包头 014010
2 内蒙古科技大学稀土产业学院包头 014010
3 内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室包头 014010
4 河北科技工程职业技术大学机电工程系邢台 054000

Process Design and Microstructure Control of Medium Manganese Steel with Continuous Yield and High Strength Yield Ratio

ZHANG Guangying¹, LI Yan²^,³, HUANG Liying⁴, DING Wei¹(

)

1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
2 School of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou 014010, China
3 Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
4 Department of Mechanical and Electrical Engineering, Hebei Vocational University of Technology and Engineering, Xingtai 054000, China

引用本文:

张光莹, 李岩, 黄丽颖, 定巍. 连续屈服、高强屈比中锰钢的工艺设计与组织调控[J]. 金属学报, 2024, 60(4): 443-452.
Guangying ZHANG, Yan LI, Liying HUANG, Wei DING. Process Design and Microstructure Control of Medium Manganese Steel with Continuous Yield and High Strength Yield Ratio[J]. Acta Metall Sin, 2024, 60(4): 443-452.

全文: PDF(2854 KB) HTML

摘要:

为了探究残余奥氏体稳定性对于中锰钢塑性失稳的影响和作用规律，本工作针对中锰钢(0.2C-5Mn-0.5Si-1.5Al，质量分数，%)，设计了预处理加临界退火的热处理工艺，得到2种残余奥氏体，并对其成分、形貌及稳定性进行了分析，进而讨论了残余奥氏体对力学性能的影响。结果表明，珠光体+马氏体+铁素体的多相初始组织退火后能够获得2种不同稳定性的残余奥氏体：源自珠光体具有较高Mn含量的薄膜状残余奥氏体；主要源自于马氏体具有适当Mn含量的块状残余奥氏体。块状残余奥氏体稳定性较差，在塑性变形初始阶段发生相变，有助于消除Lüders应变；薄膜状残余奥氏体稳定性较高，在变形中后期发生相变，有助于获得高强塑性。含双稳定性残余奥氏体的试样不仅保持了高抗拉强度(> 1000 MPa)和高断裂延伸率(> 30%)，而且还具有连续屈服和高强屈比的特点。

关键词 ：中锰钢, 残余奥氏体, 塑性失稳, 力学性能

Abstract：

Researches have focused on the development of lightweight and high-performance steel materials to ensure automobile safety. Medium manganese steel is a potential candidate owing to its excellent mechanical properties and low production cost. However, the problem of plastic instability (Lüders strain, Portevin-Le Chatelier effect) is one of the main factors restricting the development of medium manganese steel. Therefore, resolving the plastic instability of medium manganese steel is a prerequisite for its development and hence to ensure the benefits of its mechanical qualities. Many studies have found that the stability of retained austenite is directly related to the plastic instability of medium manganese steel. In this work, cold rolled low-carbon medium manganese steel is selected, and multi-stable retained austenite is obtained by designing pretreatment and critical annealing process. The phase transformation of the retained austenite with different stability in each stage of the tensile process and its influence on the mechanical properties are studied. The results show that the microstructure containing pearlite + ferrite + martensite is obtained after pretreatment of medium manganese steel. After annealing, pearlite transformed into filmy retained austenite and ferrite phase; while martensite transformed into blocky retained austenite. Mn content in the filmy retained austenite is higher than that in the blocky retained austenite, making the filmy retained austenite more stable than the blocky one. The blocky retained austenite has poor stability, and phase transformation occurs at the initial stage of plastic deformation, eliminating Lüders strain. In contrast, the filmy retained austenite has high stability, and phase transformation occurs in the middle and late deformation, contributing toward its high strength and plasticity. The specimens containing double-stable retained austenite not only maintain the tensile strength (> 1000 MPa) and high fracture elongations (> 30%), but also have the characteristics of continuous yield and high strength yield ratio.

Key words： medium manganese steel retained austenite plastic instability mechanical property

收稿日期: 2022-10-19

ZTFLH:

TG142.1

基金资助:内蒙古自然科学基金项目(2020LH05026);河北省教育厅科学技术研究项目(ZD2022034)

通讯作者: 定巍，adingwei@126.com，主要从事先进高强钢的开发与研究

Corresponding author: DING Wei, associate professor, Tel: 15034713948, E-mail: adingwei@126.com

作者简介: 张光莹，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00498 或 https://www.ams.org.cn/CN/Y2024/V60/I4/443

图 1 热处理工艺示意图

图2 A730-3和PA730-5试样退火前后的SEM像和奥氏体转变示意图

图3 A730-3和PA730-5试样的残余奥氏体晶粒尺寸分布图和平均晶粒尺寸

图4 PA730-5试样退火后块状和薄膜状残余奥氏体的TEM像、SAED花样及EDS分析

图5 PA730-5试样拉伸断裂后距离断口不同位置的取样位置示意图及SEM像

图6 A730-3和PA730-5试样拉伸前和拉伸断裂后断口处的XRD谱

图7 A730-3和PA730-5试样的工程应力-应变曲线

表1 A730-3和PA730-5试样退火后的力学性能

图8 A730-3和PA730-5试样的加工硬化指数曲线

图9 PA730-5试样断后的TEM像和Lüders带运动示意图

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