Improvement of Shape Memory Effect by Optimizing Thermal and Mechanical <i>γ</i> → <i>ε</i> Martensitic Transformation by Hot Rolling

نویسندگان

چکیده

We propose a new concept to improve functional/mechanical properties of Fe-high Mn alloys, by suppressing thermal γ → ε martensitic transformation with proper thermo-mechanical treatment. As an experimental example demonstrate the validity this concept, we tried shape memory effect Fe-15.3Mn-5.8Si-0.24C (mass-%) alloy hot rolling. The showed dual γ/ε phase at room temperature (Ms = 66°C) and poor recovery strain approximately 0.6% after solution-treatment. pre-existing ε-martensite can act as obstacles against reversible forward-reverse under loading subsequent heating. Hot rolling 800°C 70% reduction appeared dramatically up 2.9%. suppressed during cooling obtain single γ-phase temperature. Further annealing -rolled specimen 800 1000°C or 600°C deteriorated about 1%. 400°C made brittle.

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ژورنال

عنوان ژورنال: Isij International

سال: 2022

ISSN: ['0915-1559', '1347-5460']

DOI: https://doi.org/10.2355/isijinternational.isijint-2021-212