解构保留奥氏体稳定性:在单轴拉伸试验中对一相和两相块状微结构中奥氏体稳定性的现场观察

Joshua Kumpati, Manon Bonvalet Rolland, Sk. Md. Hasan, Katherine S. Shanks, Peter Hedström, Annika Borgenstam
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引用次数: 0

摘要

鉴于可转移残余奥氏体(RA)在先进高强度钢(AHSS)中的关键作用,人们对全面了解其稳定性以获得优异的机械性能产生了浓厚的兴趣。尽管受到了广泛关注并进行了大量研究,但各种微观结构因素(尺寸、结晶取向、周围相等)对 RA 稳定性的单独贡献意义仍不明确,部分原因是难以分离这些因素的直接影响。在本研究中,我们研究了微观结构因素的影响,同时尽量减少化学成分对 RA 机械稳定性的影响。为此,我们比较了两种不同微结构中奥氏体(γ)的稳定性:一种是两相 RA/马氏体微结构,另一种是单相 γ 微结构,两者的 γ 成分几乎完全相同。我们在室温和 100 °C 下进行的单轴拉伸测试中采用了原位高能 X 射线衍射技术,从而便于持续监测变形过程中的微观结构变化。通过建立宏观拉伸载荷、相载荷分配和 γ/RA 转变之间的直接相关性,我们旨在了解微观结构因素对 RA 机械稳定性的影响。结果表明,极细的 RA 尺寸和周围的硬质马氏体基体(除了对载荷分区有影响外)对 RA 在变形过程中的稳定性的影响比预期的要小。该研究结果强调了微观结构对γ/RA稳定性的关键和独特影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Deconstructing the Retained Austenite Stability: In Situ Observations on the Austenite Stability in One- and Two-Phase Bulk Microstructures During Uniaxial Tensile Tests

Deconstructing the Retained Austenite Stability: In Situ Observations on the Austenite Stability in One- and Two-Phase Bulk Microstructures During Uniaxial Tensile Tests

Given the critical role that metastable retained austenite (RA) plays in advanced high-strength steel (AHSS), there is significant interest in obtaining a comprehensive understanding of its stability, to achieve excellent mechanical properties. Despite considerable attention and numerous studies, the significance of individual contributions of various microstructural factors (size, crystallographic orientation, surrounding phases, etc.) on the stability of RA remain unclear, partly due to the difficulty of isolating the direct effects of these factors. In this study, we examined the influence of microstructural factors while minimizing the effect of chemical composition on the mechanical stability of RA. We accomplished this by comparing the austenite (γ) stability in two distinct microstructures: a two-phase RA/martensite microstructure and a one-phase γ microstructure, both with nearly identical γ compositions. We employed in situ high-energy X-ray diffraction during uniaxial tensile testing conducted at both room temperature and 100 °C, facilitating the continuous monitoring of microstructural changes during the deformation process. By establishing a direct correlation between the macroscopic tensile load, phase load partitioning, and the γ/RA transformation, we aimed to understand the significance of the microstructural factors on the mechanical stability of the RA. The results indicate that very fine RA size and the surrounding hard martensitic matrix (aside from contributing to load partitioning) contribute less significantly to RA stability during deformation than expected. The findings of this study emphasize the critical and distinct influence of microstructure on γ/RA stability.

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