Splat quenching of a nickel-chromium steel containing boron and titanium additions

Abstract

Rapid solidification (splat quenching) from the melt has been used to obtain large increases of boron solubility in an austenitic Fe-20% Cr-25% Ni steel with and without the presence of titanium. Solidification and heat-treated structures have been examined by both X-ray diffraction and transmission electron microscopy. At high titanium levels a three phase mixture of austenite, ferrite and a possible amorphous phase was observed on quenching. The nature and formation of boride precipitates from these supersaturated solutions are discussed in terms of the solidification structures and alloying elements present.