Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Relationship between Thickness of Pancake Austenite and Thickness of Grain Boundary Ferrite
Shiro TORIZUKAKotobu NAGAI
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2002 Volume 88 Issue 3 Pages 148-154

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Abstract

The grain boundary of the pancake austenite (γ) is a predominant nucleation site for ferrite (α). If the thickness of the pancake γ becomes small through deformation, the thickness of the α grains that are formed at the γ grain boundaries is also expected to become as small as the thickness of the pancake γ. On this basis, the relationship between the thickness of the pancake γ (THγ) and that of the grain boundary α (THα) is studied both experimentally and theoretically for a 0.16C-0.4Si-1.5Mn steel. When THγ is in the range of 30 to 300 μm, THα is 6-7 μm and independent of THγ. However, when THγ is less than 20 μm, THα decreases linearly with a decrease in THγ. Since the volume fraction of the pearlite is assumed to be 0.25, THα is expected to follow the relation THα<0.75THγ. The obtained relation was near THα= 0.375 THγ. The geometrical soft impingement is attributed to the decrease of THα.

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© The Iron and Steel Institute of Japan
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