变形对超高强贝氏体钢组织和力学性能的影响

doi:10.11900/0412.1961.2020.00310

金属学报

2021, Vol. 57

Issue (6): 749-756 DOI: 10.11900/0412.1961.2020.00310

研究论文

本期目录 | 过刊浏览

变形对超高强贝氏体钢组织和力学性能的影响

刘曼¹^,², 胡海江¹^,²(

), 田俊羽¹^,², 徐光¹^,²

^1.武汉科技大学省部共建耐火材料与冶金国家重点实验武汉 430081
^2.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室武汉 430081

Effect of Ausforming on the Microstructures and Mechanical Properties of an Ultra-High Strength Bainitic Steel

LIU Man¹^,², HU Haijiang¹^,²(

), TIAN Junyu¹^,², XU Guang¹^,²

^1.State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China

引用本文:

刘曼, 胡海江, 田俊羽, 徐光. 变形对超高强贝氏体钢组织和力学性能的影响[J]. 金属学报, 2021, 57(6): 749-756.
Man LIU, Haijiang HU, Junyu TIAN, Guang XU. Effect of Ausforming on the Microstructures and Mechanical Properties of an Ultra-High Strength Bainitic Steel[J]. Acta Metall Sin, 2021, 57(6): 749-756.

全文: PDF(7172 KB) HTML

摘要:

采用低温奥氏体预变形+等温贝氏体相变相结合的工艺，研究了变形对中碳贝氏体钢相变和组织的影响，利用热模拟实验、SEM、TEM、XRD和拉伸实验等分析了变形影响残余奥氏体的微观机理及其对强塑性的影响规律。结果表明，过冷奥氏体在300℃变形20%，不仅可以加速随后等温贝氏体相变，细化贝氏体组织，同时还能增加室温组织中的残余奥氏体及其稳定性。残余奥氏体稳定性同时受C含量和位错密度影响，延长等温时间可以增加奥氏体中C含量；变形可以使奥氏体中位错密度增加，有利于获得稳定性较高的残余奥氏体，从而优化超高强贝氏体钢综合性能，制备的中碳超高强贝氏体钢抗拉强度为1733 MPa，延伸率达到15.7%。

关键词 ：贝氏体钢, 残余奥氏体, 奥氏体预变形, 显微组织, 力学性能

Abstract：

Ultra-high-strength bainitic steels with excellent combinations of strength and ductility may be the new generation of metallurgical interest. However, there still exist some production problems, such as long transformation times due to low-temperature processing and difficulty in tailoring the elongation. In this work, both ausforming and austempering were used to investigate the effects of deformation on the transformation and microstructure in a medium-carbon bainitic steel. The Gleeble 3500 simulator, SEM, TEM, XRD, and tensile tests were used to analyze the effects of ausforming on retained austenite, the strength and plasticity of bainitic steel. The results show that ausforming at 300^oC with a strain of 0.2 not only accelerates the kinetics of isothermal transformation, but also refines the bainitic microstructure and optimizes the retained austenite and its stability. The stability of the retained austenite is affected by the carbon content and dislocation density, and the carbon content can be increased by prolonging the duration of the isothermal stage. The volume fraction of retained austenite is increased by ausforming because of the enhanced dislocation density, which leads to ultra-high-strength bainitic steel with excellent properties of a tensile strength of 1733 MPa and ductility of 15.7%.

Key words： bainitic steel retained austenite ausforming microstructure mechanical property

收稿日期: 2020-08-17

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51704217);湖北省技术创新专项重大项目(2017AAA116)

作者简介: 刘曼，女，1994年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00310 或 https://www.ams.org.cn/CN/Y2021/V57/I6/749

图1 热模拟实验工艺示意图

图2 变形前后试样的室温SEM像

图3 变形前后试样的TEM像

图4 变形前后试样等温期间相对膨胀量变化

图5 变形前后试样的贝氏体相变速率曲线

图6 变形前后试样的XRD谱

表1 变形前后试样的拉伸实验结果

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