Abstract
Three white cast iron alloy powders (2.4% C, 3.0% C, and 3.0% C + 1.5% Cr) manufactured by a rapid solidification processing technique were investigated. It was found that the microstructures of all three alloy powders were similar. The primary constituent of these powders was found to be retained austenite. Only small amounts of carbide and martensite were found in the rapidly solidified white cast iron powders. The primary austenite cells and dendrites that nucleate and grow from the melt are retained upon cooling to room temperature with little carbide precipitation. The low volume fraction of marensite found was due to the high carbon concentration of the austenite. A fine dispersion of carbides in an austenite matrix is formed as a result of the solidification of the eutectic liquid in the intercellular and interdendritic regions. The relative proportion of primary austenite to eutectic can be explained by the carbon segregation that occurs during the solidification of the primary austenite. Annealing of the powders at 650° C transforms the metastable austenite into alpha iron and carbide. The carbides have a bimodal distribution with small carbides precipitating within the primary austenite cells and dendrites and large carbides precipitating within the intercellular and interdendritic regions.
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References
National Materials Advisory Board, “Amorphous and Metastable Microcrystalline Rapidly Solidified Alloys: Status and Potential (NMAB 358)” (National Technical Information Service, Springfield, Virginia, 1980) pp. 1–10.
H. Jones, “Rapidly Quenched Metals”, edited by N. J. Grant and B. C. Giessen (MIT Press, Cambridge, Massachusetts, 1976) p. 1–27.
R. Mehrabian, B. H. Kear andM. Cohen (eds) “Rapid Solidification Processing Principles and Technologies II” (Claitors Publishing Division, Baton Rouge, Louisiana, 1980) pp. 1–23.
A. A. Bochvar, V. A. Davidov andL. K. Druzhinin,Dokl. Acad. Nauk USSR 230 (1976) 318.
O. A. Ruano, L. E. Eiselstein andO. D. Sher-by,Met. Trans. A 13A (1982) 1785.
M. Hansen, “Constitution of Binary Alloys” (McGraw-Hill, New York, 1958) p. 354.
J. Wadsworth andO. D. Sherby,J. Mater. Sci. 13 (1978) 264.
P. J. Patterson, A. R. Cox andE. C. Van Reuth,J. Mat. 32 (1980) 34.
“1979 Annual Book of ASTM Standards”, Part 9, B213 (American Society for Testing and Materials, Pennsylvania, 1979).
B. D. Cullity, “Elements of X-ray Diffaction” (Addison-Wesley, Reading, Massachusetts, 1967) p. 334.
“Metals Handbook”, 9th Edn, Vol. 1 (American Society for Metals, Metals Park, Ohio, 1961) p. 77.
K. H. Zum Gahr andW. G. Scholz,J. Met. 32 (1980) 38.
D. J. Dyson andB. Holmes,J. Iron Steel Inst. 208 (1971) 469.
M. C. Ruhl andM. Cohen,Trans. AIME 245 (1969) 241.
P. H. Singu, K. Kobayashi, K. Shimomura andR. Ozaki,Scripta Metall. 8 (1974) 1317.
P. B. Boswell andG. A. Chadwick,J. Mater. Sci. 11 (1976) 2287.
M. C. Flemings, “Solidification Processing” (McGraw-Hill, New York, 1974) p. 49.
J. P. Hirth.Met. Trans. A 9A (1978) 401.
C. G. Levi andR. Mehrabian,ibid. 13A (1982) 221.
A. Suzuki, T. Suzuki, Y. Nagaoka andY. Iwata,Nippon Kinzoku Gakkai-Si 32 (1968) 1301.
C. Y. Kung andJ. J. Rayment,Met. Trans. A 13A (1982) 328.
K. N. Andrews,J. Iron Steel Inst. 203 (1965) 721.
G. Krauss, “Principles of Heat Treatment of Steel” (American Society for Metals, Metals Park, Ohio, 1980).
“Metals Handbook”, Vol. 8 (American Society for Metals, Metals Park, Ohio, 1973).
K. Bungardt, E. Kunze andE. Horn,Arch. Eisenhüttenw. 29 (1958) 193.
C. Kim, V. Biss andW. F. Hosford.Met. Trans. A. 13A (1982) 185.
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Eiselstein, L.E., Ruano, O.A. & Sherby, O.D. Structural characterization of rapidly solidified white cast iron powders. J Mater Sci 18, 483–492 (1983). https://doi.org/10.1007/BF00560637
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DOI: https://doi.org/10.1007/BF00560637