The ability of steels to resist creep deformation depends on the presence in the microstructure of carbides and intermetallic compounds which precipitate during tempering or during elevated temperature service. The precipitation occurs in a sequence which leads towards thermodynamic equilibrium. The present paper deals with an extension of the Johnson-Mehl-Avrami theory for overall transformation kinetics. The modification permits the treatment of more than one precipitation reaction occurring simultaneously, afeature which isfound to be essential for representing the reactions observed experimentally in a wide range of secondary hardening steels.
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References
1.
IRVINEK. J.: in ‘Materials in power plant’, 1–10; 1975, London,The Institution of Metallurgists.
2.
AUSTINI. M., McINTYREP., and WALKERE. F.: in‘Materials in power plant’, 120–127; 1975, London, The Institution of Metallurgists.
3.
CHRISIIANJ. W.: ‘Theory of transformations in metals and alloys’, 2nd edn, Part I; 1975, Oxford, Pergamon Press.
BHADESHIAH. K. D. H., SVENSSONL.-E., and GRETOFTB.: Acta Metall., 1985,33, 1271–1283.
6.
ANELLIE., AMATOS., and DINUNZIOP. E.: ‘Mathematical model for transformation from deformed austenite’, European Coal and Steel Community, Report 7769R’, Centro Sviluppo Materiali, Rome, Italy, 1992.
7.
BHADESHIAH. K. D. H.: ‘Mathematical modelling of weld phenomena 2’, (ed.CerjakH., 71-118; 1995, London, The Institute of Materials.
8.
BHADESHIAH. K. D. H.: Mater. Sci. Technol.,1989, 5, 131–137.
9.
TSIVINSKYS. V., KOGANL. I., and ENTINR. I.: in‘Problems of metallography and the physics of metals’, (ed. LybubovYa. B.), 1985-1991; 1955, Moscow, State Scientific Press (translation, 1959, New York, Consultants Bureau).
10.
CHANCEJ. and RIDLEYN.: Metall. Trans. A, 1981, 21A, 1205–1213.
11.
HULTGRENA.: Jernkontorets Ann., 1951, 135, 403.
12.
HILLERTH.: Jernkontorets Ann., 1952, 136, 25–37.
13.
RUDBERGE.: Jernkontorets Ann., 1952, 136, 91.
14.
‘MTDATA: Metallurgical and thermochemical databank’, National Physical Laboratory, Teddington, Middx, UK, 1995.
15.
FRIDBERGJ., TORNDAHLL.-E., and HILLERTM.: Jerkontorets Ann., 1969, 153, 263–276.
16.
THOMSONR. C.: PhD thesis, University of Cambridge, 1992.
17.
ASHBYM. F. and JONESD. R. H.: ‘Engineering materials 2’, 315; 1992, Oxford, Pergamon Press.
18.
BAKERR. G. and NUTTINGJ.:. J. I'On Steel Inst.,1959, 192, 257–268.
19.
HALLM. G., KINSMANK. R., and AARONSONH. I.: Metall. Trans.,1972, 3, 1320–1322.
20.
RAYNORD., WHITEMANJ. A., and HONEYCOMBER. W. K.: J. Iron Steel Inst.,1966, 204, 349–354.
21.
THOMSONR. C. and BHADESHIAH. K. D. H.: Metall. Trans. A, 1992, 23A, 1171–1179.
22.
MIMURAH., OGHAMIM., NAOIH., FUJITAT., HALDJ. and BLUMR.: Zairyo to Purosescu (CAMP—ISIJ), 1994, 7, 809.
23.
ROBSONJ. D. and BHADESHIAH. K. D. H.: Mater. Sci. Technol.,1997, 13, 640–645.
