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Abstract

The mechanisms of crack nucleation and propagation of the lamellar microstructures found in pearlite were studied by in situ transmission electron microscopy. It was found that, in addition to the predominant mechanism of cleavage fracture in the cementite plates, ductile fracture of the cementite plates is another cracknucleation mechanism. The process of failure in the fully lamellar microstructure studied in the present investigation consists of four stages: dislocation pile-ups; single crack nucleation; distribution of crack nucleation; and crack growth, followed by final fracture. Through this study, a description of the lamellar microstructure fracture mechanism has been developed for numerical simulation in future studies.

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References

MARTIN

J. W.

, DOHERTY

R. D.

and CANTOR

: ‘Stability of microstructure in metallic systems’, 2nd edn; 1997, Cambridge, Cambridge University Press.

RAMANUJAN

R. V.

, MAZIASZ

P. J.

and LRJ

C. T.

: Acta. Mater, 1995, 44, 2611.

RAMANUJAN

R. V.

: Int. Mater. Rev., 2000, 45, 217.

HERTZBERG

R. W.

: ‘Deformation and fracture mechanics of engineering materials’, 3rd edn; 1989, Toronto, John Wiley and Sons.

ROSENFIELD

A. R.

, HAHN

G. T.

and EMBURY

J. D.

: Metall. Trans., 1972, 3, 2797.

HYZAK

J. M.

and BERNSTEIN

I. M.

: Metall. Trans A, 1976,7A, 1217.

YAMADA

: Trans Iron Steel Inst Jpn., 1977, 17, 516.

PARK

Y. J.

and BERNSTEIN

I. M.

: Metall Trans A., 1979,10A, 1653.

SUNWOO

, FINE

M. E.

and STONE

D. H.

: Metall. Trans. A., 1982, 13A, 2035.

10.

GRAY

G. T.

III , THOMPSON

A. W.

and WILLIAMS

J. C.

: Metall. Trans A, 1983, 14A, 421.

11.

ALEXANDER

D. J.

and BERNSTEIN

I. M.

. in ‘Phase transformation in ferrous alloys’, (ed. Marder

A. R.

and Goldstein

J. I.

), 243; 1984, Warrendale, PA, TMS-AIME.

12.

KAVISHE

F. P. L.

and BAKER

T. J.

: Mater. Sci. Technol, 1986, 2, 583.

13.

LEWANDOWSKI

J. J.

and THOMPSON

A. W.

: Metall. Trans. A, 1986, 17A, 1769.

14.

: Mater. Sci. Technol., 1991,7, 311.

15.

ALEXANDER

D. J.

and BERNSTEIN

I. M.

: Metall. Trans. A, 1989, 20A, 2321.

16.

STROH

A. N.

: Proc. R Soc. (London) A, 1954, 223, 404.

17.

COTTRELL

A. H.

: Trans AIME, 1958, 212, 192.

18.

SMITH

: Conf. Proc., Inst. Phys. and Phys. Soc., 1966, London, 36.

19.

MILLER

L. E.

and SMITH

G. C.

: J. Iron Steel Inst, 1970, 208, 998.

20.

PORTER

D. A.

, EASTERLING

K. E.

and SMITH

G. D. W.

: Acta Metall, 1978, 26, 1405.

21.

SEVILLANO

J. GIL

: in Proc. 5th Int. Conf. on ‘Strength of metals and alloys’, (ed. Haasen

et al), Aachen, W. Germany, August 1979, 819; 1979, Oxford, Pergamon.

22.

COURTNEY

T. H.

: ‘Mechanical behavior of materials’: 1990, New York, McGraw-Hill.

23.

LANGFORD

: Metall. Trans A, 1977, 8A, 861.

24.

SMITH

: Acta Metall., 1966, 14, 556.

25.

RIEDEL

: in ‘Materials science and technology: a comprehen-sive treatment’, (ed. Cahn

R. W.

et al), Vol. 6, (vol. ed. H. Murghrabi); 1993, Weinheim, VCH.

26.

ANDREWS

K. W.

: Acta Metall., 1963, 11, 939.

27.

HONEYCOMBE

R. W. K.

and BHADESHIA

H. K. D. H.

: ‘Steels, microstructure and properties’, 2nd edn; 1995, London, Arnold.

Insitu TEM studies of the mechanisms of crack nucleation and propagation in fully lamellar microstructures

Abstract

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