METASTABLE PHASE SOLIDIFICATION IN ELECTRON-BEAM WELDING OF
DISSIMILAR STAINLESS-STEELS
S. Tsukamoto, H. Harada and H. K. D. H. Bhadeshia
University of Cambridge
Abstract
Electron beam welds between dissimilar stainless steels with
different solidification modes were studied with a view to
elucidating the role of nucleation, cooling rate and direction
of dendrite growth on the tendency towards metastable phase
solidification. The results are compared with the
solidification behaviour of levitation melted samples. It is
demonstrated that with careful design, stainless steels which
normally solidify as ferrite can be induced into metastable
austenitic solidification by removing the barrier to the
nucleation of austenite. This is achieved in practice by
allowing stable dendrites of austenite to continue growth into
the liquid which normally solidifies to ferrite; it is found
that the direction of growth of the dendrites has to be
carefully controlled.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS
PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, Vol.178, No.1-
2, pp.189-194
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