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Effect of Cr and N on the Martensitic Transformation in Fe‐8%Mn Alloys
Author(s) -
Cabañas Neus,
Verbeken Kim,
De Cooman Bruno C.
Publication year - 2006
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200606387
Subject(s) - austenite , materials science , microstructure , martensite , ferrite (magnet) , metallurgy , alloy , diffusionless transformation , phase (matter) , temperature cycling , thermodynamics , thermal , composite material , chemistry , physics , organic chemistry
The influence of Cr and N on the transformation temperatures of a Fe‐8%Mn alloy has been investigated by means of equilibrium thermodynamics and dilatometry. The addition of Cr and N resulted in the presence of ferrite or α'‐martensite at room temperature, with the microstructure transforming to a single phase austenitic microstructure with increasing temperature. Only high amounts of Cr or N in excess of 0.2% prevented the transformation to a single phase austenitic microstructure. The addition of alloying elements resulted in a decrease of the martensite start temperature M s . The effect on the austenite start temperature A s was smaller. The effect of thermal cycling resulted in a stabilization of the transformation temperatures. More cycles were required to reach stable phase transformation temperatures when N was added to Fe‐Mn‐Cr alloys.