Abstract
The effect of austenite (γ) grain size on the morphology of e martensite (e) and the transformation from γ to e has been investigated by means of optical microscopy, transmission electron microscopy and X-ray analysis in Fe-15 mass% Mn alloy, whose γ grain size was controlled between 1 and 130 μm by the reversion treatment of deformation induced bcc martensite to γ. With refining γ grain size, the formation of e tends to be suppressed and the starting temperature of γ-e transformation is also lowered. In the grain size range below 30 μm, the transformation is markedly suppressed. In small γ grains below 30 μm, one variant of e plates go through a γ grain from one grain boundary to the other of the opposite side
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