Phase diagrams cast iron

Cast irons, although common, are in fact quite complex alloys. The iron-carbon phase diagram exhibits a eutectic reaction at 1 420 K and 4-3 wt.<7oC see Fig. 20.44). One product of this eutectic reaction is always austenite however, depending on the cooling rate and the composition of the alloy, the other product may be cementite or graphite. The graphite may be in the form of flakes which are all interconnected (although they appear separate on a... 

Numerous compounds are observed in the Li-Ag phase diagram. The alloys are heated under Ar and cast in mild steel crucibles for metallographic examination, with homogeneity achieved by remelting under vacuum. Similar procedures were employed in an earlier study, except that H2 was used in place of Ar. An Ar cover gas was also employed to prepare the brasslike yj phase in the Li-Ag system for structural study. The silver and lithium were melted together in an iron crucible for 15-30 s before cooling without quenching to minimize the loss of lithium-. ... 

Iron-carbon phase diagram, 76 196-197 Iron castings, tellurium in, 24 424 Iron(II) chloride, 74 538 Iron(III) chloride, 74 539 Iron(III) chloride hexahydrate, 74 539 Iron(II) chloride tetrahydrate, 74 538 Iron Chromate Black, pigment for plastics, 7 369t... 

Fig. 1. Iron—carbon phase diagram, where a is the body-centered cubic (bcc) a-iron, y is the face-centered cubic y-iron, and Fe3C is iron carbide(3 l) [12011 -67-5] at 6.69% C. The vertical dashed line represents the demarcation between steel on the left and cast iron on the right (3).

Iron always contains carbon. A part of the phase diagram of the iron/carbon system is shown in Figure 10.5. The carbon has different solubilities in the different iron modifications, which form mixed crystals (solid solutions). In a-iron the solubility is only 0.04% (ferrite) and in 5-iron the solubility is 0.36%. In the y-modification with its fee struemre, carbon and iron form an intercalation lattice as a solid solution called austenite with the maximum solubility of 2.06% carbon at 1147 °C. Iron with more carbon is called cast iron. Iron with less than 2.06% carbon is called steel. During slow cooling of a melt (above 1147 °C) iron solidifies either as austenite (carbon content of the melt <4.3%) or as cementite (FcjC, carbon content of the melt > 4.3%). At 1147 °C the melt solidifies in a eutectic mixture of both these phases called ledeburite. 

She] Sheludyakov, L.N., Kip yakov, G.Ye., Lyubimova, L.S., Solubility of Copper in Carbon-Reach Cast Iron (in Russian), Izv. Akad. NaukKaz. SSR, Ser. Khim., 1(19), 60-62 (1961) (Phase Diagram, Phase Relations, Experimental, 7)... 

Sil] Sil man, G.I., Kamynin, V.V., Tarasov, A.A., Effeet of Copper on Stracture Formation in Cast Iron , Met. Sci. Heat Treat., 45(7-8), 254-258 (2003), translated from Metalloved. Term. Obrab. Met., 7, 15-20 (2003) (Phase Diagram, Phase Relations, Thermodyn., Calculation, 16)... 

Kue] Kuenkele, M., The Constitution and the Formation of Phosphide Eutecticx in Cast Iron , Mitt. K.-W.-Inst. Eisenforschung, 12(4), 23-31 (1930) (Experimental, Phase Diagram, Phase Relations, 34)... 

Car] Carlberg, T., Fredriksson, H., The Influence of Sihcon and Aluminium on the Solidification of Cast Iron , Int. Conf Sohdification Casting, Sheffield, U.K., 115-124 (1977) (Calculation, Experimental, Morphology, Phase Diagram, Thermodyn., 17)... 

Sch] Schmid, R., Thermodynamic Evaluation of the System on Iron- Carbon-Silicon Within the Range of Steel and Cast Iron Melts (in German), Geissereiforsch, 32(4), 147-151 (1980) (Calculation, Thermodyn., Phase Diagram, 19)... 

Hei] Heine, R.W., The Fe-C-Si Solidification Diagram for Cast Iron (in German), Geisserei-Prax., 17, 239-247 (1987) (Experimental, Phase Diagram, Phase Relations, 23)... 

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