. Transactions. * ifll Wm ?• W hH i^^il \ j\ !S , K lb ^^k^^^B f ?^T^JH V 1 fX^ nK ^^ ^ H **V ^r ? ? •? ^ 1 Fig. 8. x iOO. Etched with HNO^,1:4. % C. Quenched at1,300° C. Arrows of FeC; Den-drites OF Fe^C and Eutectic-likeConstituent + FE4C. Fig. 9. X lOU. Etched with HNO^,1 : 10. % C. Quenched at1,640° C. The Residue of the Car-bide FeCo is Bordered by the Car-bide s:;sri;\sesss^^mm^^ammfm^mm SH^^^H I^^BH ^ ?w^^>-^ - 1 ^^^^^^^^^^^ HB\ L. -^ .* r .^J^^^Bl^^A F> .>^^ -- V -3 ?t.^ • ^^igjk. ^ •> B - .^H^-^^^^^I^H ^%w,»-- ^^LijtfH wc^ fl^^^lr^l k^T -^^
. Transactions. * ifll Wm ?• W hH i^^il \ j\ !S , K lb ^^k^^^B f ?^T^JH V 1 fX^ nK ^^ ^ H **V ^r ? ? •? ^ 1 Fig. 8. x iOO. Etched with HNO^,1:4. % C. Quenched at1,300° C. Arrows of FeC; Den-drites OF Fe^C and Eutectic-likeConstituent + FE4C. Fig. 9. X lOU. Etched with HNO^,1 : 10. % C. Quenched at1,640° C. The Residue of the Car-bide FeCo is Bordered by the Car-bide s:;sri;\sesss^^mm^^ammfm^mm SH^^^H I^^BH ^ ?w^^>-^ - 1 ^^^^^^^^^^^ HB\ L. -^ .* r .^J^^^Bl^^A F> .>^^ -- V -3 ?t.^ • ^^igjk. ^ •> B - .^H^-^^^^^I^H ^%w,»-- ^^LijtfH wc^ fl^^^lr^l k^T -^^ .^p^^^E^^^fl W~ ^^•?^K^^K^k h aif^^^^ ai~>\as. -.^H^^HI t>s**K^5B [iBt>.-,jBt-^ ^^;?i:^iH ^ ???^•^Bfv . -dnM^Jft^^^^^^H . ^C^ - ^X^uu i^. ^^^^^^^^^H ??Kfli ??^H Fig. 10. X 100. Etched with HCl, 1 : 20. C. Quenched at l,ltjO° C. Much Fe^C ;Traces of Graphite Formed from Decomposi-tion OF Fig. 11. X 100. Etched with 4 PerCent. Solution of Picric at 1,1 2U° C. /c of FeC Fe^C and theBeginning of its Decomposition. Fig. 12.—Same as Fig. 11, but Decom-position of FE4C has ProgressedFurther, Because Quenched at1,100° C. ^o C. wittorffs iron-carbon equilibrium diagram. 483 complex: L -f FegC, depending on whether the average con-centration of the carbon is more or less than per cent. 5. When the alloys cool through the range of temperaturesbetween 1,650° and 1,330° C—that is, between the lines M-Nand D-L in Fig. 1—the previously-crystallized mass begins toliquefy. This liquefaction is particularly noticeable in alloyscontaining about 7 per cent, of carbon (observations of Wittorffand Moissan). (It is to be noted that FCgC contains percent, of carbon.) The liquefaction commences at the lineM-N and is a maximum at 1,370°. Wittorff studied theliquefaction of alloys of widely-differing carbon-concentrations,and obtained the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
