Abstract
IN the course of X-ray investigations on the carbides formed in chromium and tungsten steels, a phase was encountered of a crystal structure identical with that of austenite, which at first it was thought to be. In fact, it proved to be a true carbide of iron and chromium. Its carbon content of 9·4 weight per cent carbon is similar to that in Cr7C3 (9·1 per cent C), compared with the maximum carbon solubility in austenite of only 1·7 per cent (at the eutectic in the iron–carbon system, chromium only decreasing this value). The carbides known in plain chromium steels since Westgren‘s1 early researches are (Cr,Fe)23C6, (Fe,Cr)3C and (Cr,Fe)7C3, all of which, as well as the present one, I found it possible to produce in the same steel by different heat-treatments. The carbide is believed to be of interest for its own sake, but also for more fundamental reasons given below.
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References
Westgren, A., and Nature, 133, 480 (1933). Jernkont. Ann., 117, 501 (1933); 119, 231 (1935).
Petch, N., J. Iron and Steel Inst., 145, 111 (1942).
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GOLDSCHMIDT, H. A New Carbide in Chromium Steels. Nature 162, 855–856 (1948). https://doi.org/10.1038/162855a0
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DOI: https://doi.org/10.1038/162855a0
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