A model which is experimentally supported has been derived which shows that the grain boundary carbide thickness (t) is inversely proportional to the carbide density t ∝ 1/N, where N is the number of grain boundary carbides intersected per millimetre in a linear traverse. The number of grain boundary carbides generated on transformation from the austenite has been shown to increase with cooling rate and these higher N values were associated with thinner carbides according to the above relationship. No direct relationship as is usually assumed between the values of t and d (the grain diameter), i.e. t/d is constant, was found.
MST/694
Get full access to this article
View all access options for this article.
References
1.
ALLENN. P., REPSW. P., HOPKINSB. E., and TIPLERH. R.: J. Iron Steel Inst.,1953, 174, 108.
2.
McMAHONC. J., JR and M. COHEN: Ada Metall.,1965, 13, 591.
3.
HAHNG. T., COHENM., and AVERBACHB. L.: J. Iron Steel Inst.,1962, 200, 634.
4.
CURRYD. A. and KNOTTJ. F.: Mater. Sci. J.,1978, 12, 511.
5.
MINTZB., MORRISONW. B., and JONESA.: Met. Technol.,1979, 6, 252.
6.
SMITHE.: in Proc. Conf. on ‘Physical basis of yield and fracture’, 36; 1966, Oxford, Institute of Physics and Physical Society.
7.
ALMONDE. A., TIMBRESD. H., and EMBURYJ. D.: in Proc. Conf. on ‘Fracture’, (ed.PrattP. L.), Vol. 6, 253; 1969, London, Chapman and Hall.
8.
PETCHN. J.: Acta Metall., 1986, 34, 1387.
9.
KNOTTJ. E.: ‘Fracture’, (ed. TaplinD. M. R.), Vol. 1, 61; 1977, Waterloo, Ont., University of Waterloo Press.
10.
MINTZB., MORRISONW. B., and COCHRANER. C.: in ‘Advances in physical metallurgy and applications of steels’, 222-228; 1982, London, The Metals Society.
11.
MINTZB. and CAMPBELLP.: Unpublished work. BHP Melbourne Research Laboratories, Vic., Australia.
12.
SALTYKOVS. A.: in ‘Quantitative microscopy’, (ed. De HoffR. T. and RhinesF. N.), 100; 1968, New York, McGraw-Hill.
13.
MINTZB. and KOLAHI-AVALJ.: in Proc. Int. Conf. on ‘Strength of metals and alloys’, (ed. McQueenH. J. et al.), Vol. 1,207; 1986, Oxford, Pergamon Press.
14.
MINTZB.: in ‘Advances in fracture research’, (ed., ValluriS. R. et al.), 1247; 1984, Oxford, Pergamon Press.
15.
COCHRANER. C., MINTZB., and WARDL.: submitted to Mater. ‘ Sci. Technol.
16.
MINTZB. and KOLAII-AVALJ.: Mater. Sci. Technol.,1986, 2, 1046–1050.
17.
MINTZB. and TURNERP. J.: Metall. Trans.,1978, 9A, 1611.
