Chromium-iron alloys, phase

Itk] Itkin, V.P., Cr-Fe (Chromium-Iron) in Phase Diagram of Binary Iron Alloys , Okamoto, H. (Ed.), ASM International, Materials Park, OH (1993) (Crys. Structure, Phase Diagram, Assessment,, 33)... [Pg.391]

Improvement in oxidation resistance of iron by alloying with aluminum or chromium probably results from a marked enrichment of the innermost oxide scale with respect to aluminum or chromium. The middle oxide scales are known, from chemical analysis, to be so enriched, and electron-microprobe analyses confirm marked enrichment of chromium in the oxide adjacent to the metal phase in the case of chromium-iron alloys [52]. These inner oxides resist ion and electron migration better than does FeO. For chromium-iron alloys, the enriched oxide scale is accompanied by depletion of chromium in the alloy surface immediately below the scale. This situation accounts for occasional rusting and otherwise poor corrosion resistance of hot-rolled stainless steels that have not been adequately pickled following high-temperature oxidation. [Pg.233]

Coatings are also sometimes produced by gas-phase reaction. For example, CrCl2, when volatilized and passed over steel at about 1000°C (1800°F), results in formation of a chromium-iron alloy surface containing up to 30% Cr in accord with the reaction... [Pg.270]

Exposure of certain alloys to elevated temperatures can produce phase changes within the alloy. These phase changes can sometimes lead to corrosive attack of the aUoy. Corrosion can occur if the phase change alters the formation of protective barriers on surface. Examples of this mechanism are sensitization of stainless steels (discussed earlier) and sigma phase (a) formation. Sigma phase formation occurs in nickel-chromium-iron and chromium-iron alloys containing a minimum of 16.5 %... [Pg.73]

Cr C Cr C chromium iton(l l) [12052-89-0] CrFe (c phase), and chromium iron molybdenum(12 36 10) [12053-58-6] Cr 2F 36 o Q phase), are found as constituents in many alloy steels Ct2Al23 and CoCr ate found in aluminum and cobalt-based alloys, respectively. The chromium-rich interstitial compounds, Ci2H, chromium nitrogen(2 l) [12053-27-9] Ct2N, and important role in the effect of trace impurities on the... [Pg.121]

Microstructures of two alloys exposed in the CGA atmosphere are presented in Figs. 4 and 5. The microstructure of AISI 314 exposed 1000 hr at 1800 F in the CGA gas containing 0 v/o H2S is shown in Fig. 4. The adherent, layered scale on this alloy consisted of fourteen individual metal-oxide layers. Metal phase visible in the scale was nickel-rich containing some iron, but was free of chromium. Oxide phase was chromium-rich tending towards a chromium-iron spinel at the oxide-metal interface. This imusual microstructure was also observed on AISI 309 and 310 exposed under the same conditions, although fewer layers were present. [Pg.401]

Put] Putman, J.W., Grant, N.J., Bloom, D.S., a Phase in Chromium-Molybdenum Alloys with Iron or Nickel in Symposium on the Nature, Occurrence, and Effects of Sigma Phase , American Society for Testing Materials, Philadelphia, PA, 61-68 (1950) (Morphology, Phase Diagram, Experimental, 6)... [Pg.191]

Bae] Baen, S.R., Duwez, P, Constitution of Iron-Chromium-Molybdenum Alloys at 1200F , Trans. Amer. Inst. Min. Met. Eng., 191, 331-335 (1951) (Crys. Straeture, Morphology, Phase Diagram, Experimental, 13)... [Pg.191]

Siw] Siwka J., Tochowicz S., Nitrogen Solubility in Liquid Iron Alloys Containing High Amounts of Chromium and Manganese in Hyperbaric Conditions , Arch. Metall, 35(3), 449-461 (1990) (Experimental, Phase Relations, 26)... [Pg.214]

Rayl] Raynor, G.V., Rivlin, V.G., The Cr-Fe-Ni (Chromium-Iron-Nickel) System , Bull. Alloy Phase Diagrams, 2(1), 89-99 (1981) (Phase Diagram, Phase Relations, Review, 46)... [Pg.255]

Munl] Mundt, R., Hoffmeister, H., Phase Equilibria in Iron Rich Iron-Chromium-Nickel Alloys at Temperatures between 1200 and 1350°C , Arch. Eisenhuettenwes., 54(6), 253-256 (1983) (Experimental, Phase Diagram, Phase Relations, 12)... [Pg.255]

Rag] Raghavan, V, The Cr-Fe-S (Chromium-Iron-Sulphur) System in Phase Diagrams of Ternary Iron Alloys , Indian Inst. Met., Calcutta, 2, 107-120 (1988) (Review, Phase Diagram,, , 32)... [Pg.335]

And] Andersson, J.-O., Sundman, B., Thermodynamie Properties ofthe Cr-Fe System , Calphad, 11(1), 83-92 (1987) (Phase Diagram, Phase Relations, Thermodyn., Review, Assessment, 51) [1987Rag] Raghavan, V, The Cr-Fe-Si (Chromium-Iron-Silieon) System in Phase Diagrams of Ternary Iron Alloys , Part 1, Ind. Inst. Teehn., Delhi, 1, 31-42 (1987) (Crys. Strueture, Phase Diagram, Phase Relations, Review,, 24)... [Pg.373]

Mim] Mima, G., Yamaguchi, M., Takahashi, J., Ageing Behaviour of Ternary Iron-Chromium-Vanadium Alloys Around 500°C (in Japanese), J. Jpn. Inst. Met., 31,470-475 (1967) (Crys. Structure, Morphology, Phase Diagram, Phase Relations, Experimental, 12)... [Pg.409]

Transformation in Iron-Chromium Carbon Alloys , Acta Metall., 16(5), 609-620 (1968) (Crys. Stracture, Morphology, Phase Relations, Experimental, 22)... [Pg.79]

Tab] Tabrett, C.P., Sare, I.R., Ghomashchi, M.R., Microstructure-Property Relashionships in High Chromium White Iron Alloys , Int. Mater. Rev., 41(2), 59-82 (1996) (Morphology, Phase Relations, Review, Mech. Prop., Interface Phenomena, 191)... [Pg.87]

Nat] Natesan, K., Kassner, T.F., Thermodynamics of Carbon in Nickel, Iron-Nickel and Iron-Chromium-Nickel Alloys , Metall. Trans., 4, 2557-2566 (1973) (Experimental, Phase Diagram, Thermodyn., 39)... [Pg.309]

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