Solubility of carbon in 18-percent-chromium 10-percent-nickel austenite

A series of high-puri ty iron-chromium-nickel alloys, made to a base analysis of 18 percent of chromium and 10 percen t of nickel, and wi t h carbon rangin g from 0.007 to 0.30 percen t, was m elted and sol idified in vacuum . The presence or absence of carbides in t hese alloys after various m echani cal and t hermal t rea tm ents was determined by m etallographi c examinat ion . The practical limit of solubili ty varied from less t han 0.007 per cent of carbon at 1,300 F to sli ghtly m ore than 0.077 p ercent at 1,9 75 F , t he hi ghest temperat ure studied.