Relationship between decarburisation and fatigue strength of through hardened and carburising steels

Abstract

The effect of surface decarburisation upon the fatigue strength in rotating bending of a through hardened low alloy steel and a carburised carburising steel was investigated. The relationships between surface carbon content, depth of decarburisation, microhardness, residual stress, surface finish, and fatigue limit were examined. Whereas the fatigue limit was found to be independent of the depth of decarburisation over the range investigated (up to 1 mm), linear relationships were found between fatigue limit and surface carbon concentration and micro hardness. Furthermore, the presence of residual tensile stresses at the surface were found to lead to a reduction of fatigue limit. The fatigue limit of the rough machined specimens was found not to be significantly lower than that of the polished specimens.

MST/1179

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References

KRUSZYNSKI

B. W.

and Van LUTTERVELT

K. A.

: Adv. Mannl Eng., July 1989, 1, 187.

Proc. Conf. on ‘Decarburisation'; 1970, London, The Iron and Steel Institute.

BAIN

E. C.

: ‘Functions of alloying elements in steels’; 1939, Cleveland, OH, ASM.

SAGARADZE

V. S.

: Met. Sci. Heat Treat., 1970, 3, 198.

KUNIO

: in Proc. 2nd Int. Conf. on ‘Fracture’, (ed. Pratt

P. L.

), 630; 1969, London, Chapman & Hall.

COOPER

C. V.

and FINE

M. E.

: Metall. Trans., 1985, 16A, (4), 641.

NISITANI

: ‘Current research on fatigue cracks: current Japanese Materials Research’, (ed. Tanaka

, Vol. 1, 1-26; 1987, Amsterdam/London, Elsevier.

Personal communication, Jonas Woodhead Ltd, Manchester, 1978.

SPIEGLER

, WEISS

B. Z.

, and TAUB

: J. Iron Steel Inst., June 1964, 202, 509–517.

10.

GILDERSLEEVE

M. J.

: Unpublished work, Department of Metallurgy, Manchester Polytechnic, 1978.

11.

SAGARADZE

V. S.

and MALYGINA

L. V.

: Met. Sci. Heat Treat., 1966, 7, 39.

12.

Personal communication, David Brown Gears Ltd, Huddersfield, 1978.

13.

BARRETT

C. S.

and MASSALSKI

T. B.

: in ‘Structure of metals’, 3 edn, 472; 1980, Oxford, Pergamon Press.

14.

FORSYTH

P. J. F.

: Acta Metall., 1963, 11, 704.

15.

KANNINEN

M. F.

, AHMAD

, and LEIS

B. N.

: in ‘Mechanics of fatigue’, AMD-47, (ed. Mura

, 81; 1981, New York, ASME.

16.

NISITANE

in ‘Mechanics of fatigue’, AMD-47, (ed. Mura

, 151; 1981, New York, ASME.

17.

MORRIS

W. L.

, JAMES

M. R.

and BUCK

: Metall. Trans., 1981, 12A, 57.

18.

HUDAK

S. J.

: J. Eng. Mater. Technol. (Trans. ASME), 1981, 103, 26.

19.

YAMADA

, HOSHIDE

, FAJIMURA

, and MANABE

: Trans. Jpn Soc. Mech. Eng., 1983, A49, 441.

20.

MILLER

K. J.

: Fatigue Eng. Mater. Struct., 1982, 5, 223.

21.

TAYLOR

and KNOTT

I. F.

: Fatigue Eng. Mater. Struct., 1981, 4, 147.

22.

S. suitEsx and R . O. RICHIE: Int. Met. Rev., 1984, 29, (6), 445.

23.

TANAKA

: in Proc. ASTM Symp. on ‘Fatigue’, (ed. Fong

J. T.

); 1984, Philadelphia, PA, ASTM.

24.

KUNIO

, SHIMIZU

, and YAMADA

: in Proc. ‘Fatigue 1984’, 817, 1984, Warley, W. Midlands, EMAS.

25.

LINDLEY

T. C.

and Nix

K. J.

: in ‘Fatigue crack growth’, (ed. Smith

R. A.

), 53-74; 1986, Oxford, Pergamon Press.

26.

SCHIJVF

: in Proc. ‘Fatigue 1984’, 751; 1984, Warley, W. Midlands, EMAS.

27.

FROST

N. E.

, MARSH

K. J.

, and POOK

L. P.

: in ‘Metal fatigue’, 196; 1974, Oxford, Clarendon Press.

28.

LANKFORD

: Int. J. Fatigue Fract. Eng. Mater. Struct., 1985, 8, 161–174.

29.

USAMI

: ‘Current research on fatigue cracks: current Japanese Materials Research’, (ed. Tanaka

, Vol. 1, 119-147; 1987, Amsterdam/London, Elsevier.