中锰钢不连续屈服与流变应力锯齿形成的机理分析

胡斌; 眭涵; 温庆桦; 汪峥; Alexander Gramlich; 罗海文

doi:10.1007/s12613-023-2751-1

Volume 31 Issue 6

Jun. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(6): 1285-1297

Bin Hu, Han Sui, Qinghua Wen, Zheng Wang, Alexander Gramlich, and Haiwen Luo, Review on the plastic instability of medium-Mn steels for identifying the formation mechanisms of Lüders and Portevin–Le Chatelier bands, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1285-1297. https://doi.org/10.1007/s12613-023-2751-1

Cite this article as:

Bin Hu, Han Sui, Qinghua Wen, Zheng Wang, Alexander Gramlich, and Haiwen Luo, Review on the plastic instability of medium-Mn steels for identifying the formation mechanisms of Lüders and Portevin–Le Chatelier bands, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1285-1297. https://doi.org/10.1007/s12613-023-2751-1

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特约综述

中锰钢不连续屈服与流变应力锯齿形成的机理分析

1)
北京科技大学冶金与生态工程学院, 北京, 100083, 学院路30号, 中国
2)
亚琛工业大学钢铁研究所, 亚琛, Intzestraße 1, 52072, 德国

通讯作者:
胡斌 E-mail: hubin@ustb.edu.cn

罗海文 E-mail: luohaiwen@ustb.edu.cn

文章亮点

(1) 系统综述了残余奥氏体、相界面和变形参数等诸多因素对中锰钢屈服行为和应力锯齿的影响。

(2) 分析发现形变诱导马氏体相变不是中锰钢发生塑性失稳的根本原因，但其通过影响位错密度和可动性、奥氏体中位错和间隙原子的相互作用等既可促进也可抑制塑性失稳。

(3) 分析了目前实验结果相互矛盾的可能原因，提出了中锰钢发生不连续屈服的统一解释和流变应力出现锯齿的机理。

中文摘要

中锰钢拉伸变形过程经常发生塑性失稳，包括不连续屈服和应力锯齿，近年来被金属材料科学家广泛关注和深入研究。然而，现有研究结果存在争议，尚未就这一现象提出统一解释。本文首先总结了各种可能影响中锰钢屈服行为和应力锯齿的因素，包括奥氏体的形貌和稳定性，相界特征和形变参数等；据此提出了能解释现有相互矛盾实验结果的统一机理。其中，不连续屈服现象归因于形变前缺少可移动位错和塑性变形初期位错的快速增殖；应力锯齿的形成是由于奥氏体中间隙原子和位错之间的钉扎和脱钉作用。受奥氏体稳定性和形变参数影响的应变诱导马氏体相变不是中锰钢中发生塑性失稳的根本原因，但其可以通过影响位错的可动性和密度，以及奥氏体中间隙原子和位错的相互作用而加强或减弱不连续屈服和应力锯齿现象。

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Invited Review

Review on the plastic instability of medium-Mn steels for identifying the formation mechanisms of Lüders and Portevin–Le Chatelier bands

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Abstract

Abstract

Plastic instability, including both the discontinuous yielding and stress serrations, has been frequently observed during the tensile deformation of medium-Mn steels (MMnS) and has been intensively studied in recent years. Unfortunately, research results are controversial, and no consensus has been achieved regarding the topic. Here, we first summarize all the possible factors that affect the yielding and flow stress serrations in MMnS, including the morphology and stability of austenite, the feature of the phase interface, and the deformation parameters. Then, we propose a universal mechanism to explain the conflicting experimental results. We conclude that the discontinuous yielding can be attributed to the lack of mobile dislocation before deformation and the rapid dislocation multiplication at the beginning of plastic deformation. Meanwhile, the results show that the stress serrations are formed due to the pinning and depinning between dislocations and interstitial atoms in austenite. Strain-induced martensitic transformation, influenced by the mechanical stability of austenite grain and deformation parameters, should not be the intrinsic cause of plastic instability. However, it can intensify or weaken the discontinuous yielding and the stress serrations by affecting the mobility and density of dislocations, as well as the interaction between the interstitial atoms and dislocations in austenite grains.
- medium manganese steel;
- discontinuous yielding;
- stress serrations;
- retained austenite;
- dislocations

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