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High pressure torsion processing of maraging steel 250: Microstructure and mechanical behaviour evolution

机译：钢的高压扭转加工250：微观结构和机械行为演化

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摘要

Maraging steels are precipitation strengthened martensitic steels with an unusual combination of strength and ductility. High Pressure Torsion (HPT) has been used in this study to produce maraging steel 250 grade (AMS 6512) with finer laths and higher dislocation density, both of which act as nucleation sites for precipitation, and reverted austenite formation. This study focusses on the effect of such a processing on the evolution of the microstructure, including kinetics of precipitation, recrystallisation and austenite reversion as well as the stability of the precipitates thus formed. It was found that the aging kinetics accelerated substantially in the HPT processed samples, by achieving peak aging conditions at considerably shorter temperature/time durations and also a peak hardness higher than the as-received sample by 41%. Detailed microstructural characterisation revealed a change in the precipitate morphology from spherical to plate like form in the overaged conditions. The impact of this on mechanical response of these steels was quantified using tensile tests. A 70% increase in ultimate tensile strength was achieved in HPT processed samples after peak aging. Changes in strength and ductility were correlated to the changes in the microstructure and their impending contributions to different strengthening mechanisms at play to enable better design of maraging steels.
机译：沉淀钢的沉淀强化了马氏体钢，具有不寻常的强度和延展性的组合。本研究中使用了高压扭转（HPT），以产生具有更精细的板条和更高的位错密度的钢250级（AMS 6512），这两者都是沉淀的成核位点，并恢复奥氏体形成。该研究侧重于这种处理对微观结构的演化的影响，包括沉淀，重结晶和奥氏体逆转的动力学以及由此形成的沉淀物的稳定性。发现老化动力学基本上在HPT加工样品中加速，通过在相当较短的温度/时间持续时间内实现峰值老化条件，并且峰值硬度高于AS接收的样品的峰值硬度达41％。详细的微观结构表征揭示了在覆盖条件下从球形到板状形式的球形形态的变化。使用拉伸试验量化这一点对这些钢的机械响应的影响。在峰老化后，在HPT加工样品中实现了最终拉伸强度的70％。强度和延展性的变化与微观结构的变化及其在游戏中的不同强化机制的暂时贡献相关，以实现摆动钢材的更好设计。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140665.1-140665.13|共13页
  • 作者

    Kevin Jacob; Deepesh Yadav; Saurabh Dixit; Anton Hohenwarter; Balila Nagamani Jaya;

  • 作者单位

    Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Mumbai Maharashtra 400076 India;

    Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Mumbai Maharashtra 400076 India;

    Mishra Dhatu Nigam Ltd. (MIDHANI) Hyderabad Telangana 500058 India;

    Department of Materials Science Chair of Materials Physics Montnnuniversitat Leoben Jahnstmsse 12 8700 Leoben Austria;

    Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Mumbai Maharashtra 400076 India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Maraging steels; High pressure torsion; Precipitation kinetics; Mechanical behaviour;

    机译：散布钢;高压扭转;降水动力学;机械行为;

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