MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678

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Formation of Fully Annealed Nanocrystalline Austenite in Fe–Ni–C Alloy
Shuai ChenAkinobu ShibataSi GaoNobuhiro Tsuji
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JOURNAL FREE ACCESS Advance online publication

Article ID: M2013324

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Abstract
Nanocrystalline austenite having fully annealed and equiaxed morphology, grain sizes varying from 400 nm to 1.7 µm, and a large fraction of high-angle grain boundaries was prepared in Fe–24Ni–0.3C (mass%) alloy by high-pressure torsion and subsequent heat treatment. The nanostructures were formed through reverse transformation of deformation-induced martensite and recovery/recrystallization of retained austenite. The austenitic grain size decreased with increasing shear strain below the strain of 50, while it increased above the shear strain of 50 due to decreased austenite-transformation starting temperature.
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© 2013 The Japan Institute of Metals and Materials
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