Title: Phase-diagram study of alloys in the iron-chromium-molybdenum-nickel system
Abstract: Alloys in the iron-chromium-molybde num-nickcl syste m were examined after qu enching from 2,200°, 2,000°, 1,800°, 1,650°, and 1,500° F. Composit ional l imi ts of s tability of se ven phases were summarized in diagram s.F e, Mo was foun d. to be a stable phase; and a ternary phase, not previou sly r eported, was identifi ed to hav e the approximate composition of 4 p ercen t of chromium, 53 p ercent of iron, and 43 p er ce nt of molybdenum.T An1-!,; 1. N{anufacturer and chemical analyses of metal powders lVrctal powder I Ma nu facturer I C hem ieal a nalysis % i\t(ol ybcl cnum ___ Johnsan, ]Vrat h (' ~r & 00 _ 99.9 min im ulll ..1)0 _________ _ C harl es I fard y, In c ___ 99.9 minim ulll.i'> ickcL _________ Interna tiona l N ickel • s pee trogmghic m ethod: 0.01 Co., co urtesy of A I, 0.00] 0, 0.001 C u, 0.1 FranciS B. F oley.Fe, 0.00 ] M.g, 0.001 Mil, 0.001 Pb, 0.01 S i. ])0 __ ----____ l )i,c.: intcgrati ng IV[ eta l • S pec trogra phic method: 0. 1 Co .A ], 0.001 Ca, 0.01 Cr, 0. 1 C u ,O.O ] M g, 0.001 Pb,O.OI rl' i. C hern ieal methods: Chromi uln ______ Elect ro M eta llu rgica l 0.12 Co, 0.09 F e, 0.06 S i. C lwnical methods : 0.01 C, Co., cour tC'sy of 0.03 Fe, 0.01 Cu, 0.0 1 Pb, R ussell Franks.0.0:!3 S, 0.5<1 0 , 0.0]2 J[ , 0.008 N.Iron ------.----GeneralAnilin e & Ca rbon y l iro n : 99.6 to 99.9.Fi lm Co.Il. Va luC's a l'c maximum limits.A na lyscs of nick el were maci ca L Lil e Burea u; Lheolhers were given by lhe ma n ufctCLUre rS.FIG U RE 1. Compositions of alloys investigated containing 70 percent of iron and areas in which hard phases were found after sintering tl'eatment at 2,500° F and furnace cooling.F I GURE 3. Microstnlctll1•e of alloy 70 Fc-2 Cr-28 Mo after reheating to 2,500° Ji' for 2 hours and quenching in water.Conce n trated hydroch loric acid contain in g few drops of nit ri c acid followcd by 15 seconds in co ld alka li ne fcrr icyanidc rca~c n t.J'hascs identified were E (da rk ) su rrounded by p (white) in matrix (Widmanstiittc n stru ct ure) co n s i s ti n~ of a lternate bands of a and p .X 1000.