Abstract: Up to now, the function of Mo in the high chromium white iron was to increase the hardenability according to many former studies. But in this paper the results show that when the precipitation of high Cr-Mo white iron took place, the Mo precipitated in the form of Χ-phase from the austenitic matrix prior to other carbonite, which results in the change of precipitate and precipitation.

Key words: High chromium white iron, Molybdenum, Structure