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首页> 外文期刊>Materials Science and Engineering >Mechanical behavior and microstructural evolution of a bainite-based quenching-partitioning (BQ&P) steel under high strain rates
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Mechanical behavior and microstructural evolution of a bainite-based quenching-partitioning (BQ&P) steel under high strain rates

机译：高应变率下贝氏体淬火分配（BQ＆P）钢的力学行为和微观结构演化

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摘要

In this paper, the mechanical behavior of a bainite-based quenching-partitioning (BQ&P) steel under high strain rates in a range of 2200-3600/s was studied using Split Hopkinson Pressure Bar (SHPB) experimental technique. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were employed to investigate the microstructural change and fracture behavior. Results show that the stress-strain relation of the steel exhibits obvious strain rate dependence, i.e. strength increases as strain rate increases. After high strain rates deformation, twisting, directional arrangement or crystal rotation appeared for lath (Bainite&Martensite) structure, and a ＜100＞ fiber texture was formed, indicating that the slip mechanism operates under high strain rates. As the strain rate increases from 2200-3000 1/s to 3001-3600 1/s, the fracture frequency of samples significantly increases from 33.3% to 77.8%. The fracture of the BQ&P steel is characterized as 45° fracture mode with dimples near impact end and shear river pattern near the other end. Most of blocky retained austenite (RA) underwent martensitic phase transformation in the form of γ→α′ and/or γ→ε→α′ during high strain rates deformation, whereas only partial RA inside a filmy RA underwent martensitic phase transformation. The calculated adiabatic temperature rise, ～100°C is considered to increase the stability of RA, which results in the occurrence of stress-induced γ→ε transformation under high strain rates. The increased frequency of fracture by increasing strain rates can be attributed into the delayed strain response and embrittlement caused by the martensitic transformation of RA under higher strain rates.
机译：在本文中，使用分裂霍普金森压力棒（SHPB）实验技术研究了2200-3600 / s范围内的高应变率下的贝氏体淬火分配（BQ＆P）钢的力学行为。使用扫描电子显微镜（SEM），电子反向散射衍射（EBSD）和透射电子显微镜（TEM）来研究微观结构变化和裂缝行为。结果表明，钢的应力 - 应变关系表现出明显的应变速率依赖性，即随着应变速率的增加，强度增加。在高应变率变形的变形之后，扭曲，定向布置或晶体旋转出现用于LATH（贝氏体和马氏体）结构，形成<100>纤维纹理，表明滑移机构在高应变率下运行。随着应变速率从2200-3000 1 / s增加至3001-36001 / s，样品的骨折频率从33.3％显着增加至77.8％。 BQ＆P钢的骨折的特点是45°裂缝模式，凹陷靠近撞击端附近，另一端附近的剪切河图案。在高应变率变形期间，大多数嵌段保留的奥氏体（RA）以γ→α'和/或γ→ε→α'的形式接受了马氏体相变，而仅薄膜Ra内部的部分Ra接受着马氏体相变。考虑计算的绝热升温〜100℃以增加RA的稳定性，这导致在高应变率下发生应力诱导的γ→ε变换。通过增加应变率的裂缝频率增加可归因于RA在较高应变率下由Ra的马氏体转化引起的延迟应变响应和脆化。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141414.1-141414.13|共13页
  • 作者

    Xian Wu; Fengchun Jiang; Zhenqiang Wang; Ding Yuan; Guhui Gao; Chunhuan Guo;

  • 作者单位

    Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China;

    Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China;

    Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China;

    Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China;

    Material Science & Engineering Research Center School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China;

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  • 正文语种 eng
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  • 关键词

    Mechanical behavior; Microstructural evolution; Quenching partitioning steel; Retained austenite; High strain rate;

    机译：力学行为;微观结构演变;淬火隔离钢;保留奥氏体;高应变率;

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