Abstract
The evolution of carbides during aging of a spray-formed chromium-containing tool steel was studied. In the as-spray-formed steel, there are two prominent types of carbides: the V-rich proeutectoid MC and the Fe-rich M3C in lower bainite. Evolution of the carbides during aging can be described as follows. While the proeutectoid MC remains unchanged, a portion of the M3C dissolves into the bainitic ferrite matrix, and another portion of it is transformed into Cr-rich M7C3. In addition, fine alloyed carbides, such as M7C3, MC, Cr-rich M23C6, and Mo-rich M6C, precipitate from the matrix consisting of bainitic ferrite, martensite, and retained austenite.
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