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My understanding of why alloys with chromium, and possibly other elements, it that not only can the chromium help form carbides in the steel but atoms of chromium can be substituted for iron atoms in the iron matrix. That helps prevent the austenite formation from slipping into a body centered tetrahedron. In short, to form retained austenite. The cold treatment with a dry ice and acetone bath or true cryotreatment with liquid nitrogen forces the retained austenite to shear into untempered martensite.
Doug
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