Iron-chromium-carbon system at 870°C
Tóm tắt
A series of 13 Fe-Cr-C alloys was studied to determine the phases present after the alloys were equilibrated for 1000 h at 870°C (1600°F). The alloys had a nominal composition of 1 pct carbon and 0 to 29 pct chromium. The experimental program employed: a) selective etching plus X-ray diffraction studies of extracted carbides to identify the carbides, b) quantitative metallography plus electrolytic carbide extraction to determine the quantity of carbides, and c) electron microprobe analyses plus chemical analyses of extracted carbides to determine the carbide compositions. Microprobe traverses through the carbide particles and the adjoining matrices showed that equilibrium had been established. The In and In6 carbides were all stoichiometric with respect to car bon—in contrast to most prior diagrams which show the M3C and M7C3 forming a pseudobinary system.
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