In the present work a 2.9%C-22%Cr white cast iron was processed by spray forming aiming to investigate the potential of achieving novel microstructure by the high cooling rate involved in this process. Two gas flow rate to metal flow rate ratios (0.12 and 0.23) were used. The microstructural characterization was performed by using X-ray diffractometry, optical and scanning electron microscopy. The conventional microstructure of this alloy shows M7C3 carbides (about 300 mum in length) embedded in a matrix of austenite and martensite dendrites; on the other hand the spray formed deposit showed a microstructure formed by fine M7C3 carbides (less than 10 mum in length) in a martensitic matrix. The overspray powders showed a microstructure composed mainly by carbides and austenite; the relatively rapid solidification of. the droplets enhanced the chromium and carbon solubility in austenite changing the MS temperature.