碳含量对低密度钢的显微结构和拉伸性能的影响

商永轩; 范明雨; 江树勇; 张中武

doi:10.1007/s12613-024-2937-1

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 一校

Yongxuan Shang, Mingyu Fan, Shuyong Jiang, and Zhongwu Zhang, Effects of carbon content on the microstructure and tensile properties of a low-density steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2937-1

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Yongxuan Shang, Mingyu Fan, Shuyong Jiang, and Zhongwu Zhang, Effects of carbon content on the microstructure and tensile properties of a low-density steel, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2937-1

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研究论文

碳含量对低密度钢的显微结构和拉伸性能的影响

1)
哈尔滨工程大学材料科学与化学工程学院超轻材料与表面技术教育部重点实验室, 哈尔滨150001, 中国
2)
鞍钢集团海洋装备用金属材料及其应用国家重点实验室, 鞍山114009, 中国

通讯作者:
张中武 E-mail: zwzhang@hrbeu.edu.cn

文章亮点

(1) 提出了一种制备包含α铁素体和奥氏体双相低密度钢的制备方法

(2) 系统地研究了碳含量对低密度钢的显微结构的影响规律

(3) 利用Crussard–Jaoul 方法分析了单相和双相低密度钢的加工硬化行为的区别

中文摘要

碳元素可以改变低密度钢的相组成，以影响其力学性能。本文提出了一种通过在固溶处理过程中脱碳处理控制碳含量，形成包含α-铁素体和奥氏体的双相低密度钢，以避免传统双相低密度钢在熔炼过程中，δ-铁素体从液相析出的新方法。系统地研究了碳含量改变引起的显微结构和力学性能的变化，并采用Crassard–Jaoul (C–J)方法分析了单相和双相低密度钢在拉伸过程中的加工硬化行为。在固溶处理过程中，奥氏体中的碳含量降低，Mn和Al含量基本不变；这使得基体相由奥氏体转变为奥氏体和铁素体双相。(Ti,V)C碳化物存在于基体相中且摩尔分数基本不变。此外，它抑制了其它碳化物的形成。由于碳含量降低，固溶强化效果减弱，导致双相低密度钢的屈服强度降低。对于单相奥氏体钢，奥氏体的变形方式为位错的平面滑移，最终形成微带。对于双相低密度钢，变形首先由奥氏体中的位错平面滑移发生，随着应变的增大，铁素体内发生波系滑移，在铁素体中形成了位错胞。在变形后期，奥氏体的硬化速度较快，而铁素体的硬化速度减慢。

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Research Article

Effects of carbon content on the microstructure and tensile properties of a low-density steel

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Abstract

Abstract

Carbon can change the phase components of low-density steels and influence the mechanical properties. In this study, a new method to control the carbon content and avoid the formation of δ-ferrite by decarburization treatment was proposed. The microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically examined. Crussard–Jaoul (C–J) analysis was employed to examine the work hardening characteristics during the tensile test. During decarburization by heat treatments, the carbon content within the austenite phase decreased, while Mn and Al were almost unchanged; this made the steel with full austenite transform into the austenite and ferrite dual phase. Meanwhile, (Ti,V)C carbides existed in both matrix phase and the mole fraction almost the same. In addition, the formation of other carbides restrained. Carbon loss induced a decrease in strength due to the weakening of the carbon solid solution. For the steel with the single austinite, the deformation mode of austenite was the dislocation planar glide, resulting in the formation of microbands. For the dual-phase steel, the deformation occurred by the dislocation planar glide of austenite first, with the increase in strain, the cross slip of ferrite took place, forming dislocation cells in ferrite. At the late stage of deformation, the work hardening of austinite increased rapidly, while that of ferrite increased slightly.
- low-density steels;
- carbon content;
- decarburization;
- strengthening mechanisms;
- work hardening behavior

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