Phase transformation during in situ heating of low-activation austenitic steel

IF 0.4 4区物理与天体物理 Q4 PHYSICS, MULTIDISCIPLINARY

Russian Physics Journal Pub Date : 2025-01-07 DOI:10.1007/s11182-024-03291-1

I. Yu. Litovchenko, S. A. Akkuzin, N. A. Polekhina, K. V. Spiridonova, M. A. Khimich, A. V. Kim, V. V. Osipova, V. M. Chernov

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Abstract

The peculiarities of phase transformations in dispersion-strengthened low-activation chromium-manganese austenitic steel under high-temperature heating and cooling are studied using in situ X‑ray diffraction (XRD) and transmission electron microscopy (TEM). The presence of ε‑martensite plates in this steel after ageing (700 °C, 100 h) is shown. This phase is formed under local internal stresses arising from intensive growth of dispersed particles of M₂₃C₆ carbides (M – Cr, Mn, Fe) during the steel cooling from the aging to room temperature. The comparatively low stacking fault energy (25 mJ/m²) of steel and the low stresses of ε‑martensite formation favor the γ→ε transformation. The in situ studies show that under subsequent high-temperature heating up to 500–590 °C, the ε‑phase completely transforms into austenite. During cooling from 590 °C to room temperature, this phase appears again. The formation of ε‑martensite does not affect the structural-phase stability of austenite near the temperature range of anticipated operating conditions.

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来源期刊

Russian Physics Journal PHYSICS, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

50.00%

发文量

208

审稿时长

3-6 weeks

期刊介绍： Russian Physics Journal covers the broad spectrum of specialized research in applied physics, with emphasis on work with practical applications in solid-state physics, optics, and magnetism. Particularly interesting results are reported in connection with: electroluminescence and crystal phospors; semiconductors; phase transformations in solids; superconductivity; properties of thin films; and magnetomechanical phenomena.