Creep–structural relationship in steel alloy 800 H at 900

Abstract

The creep properties of the 32Ni–20Cr steel alloy 800 H have been investigated in the temperature range 900–1000°C. The results show that the creep behaviour is characterized by various irregularities. Structural analyses performed for selected creep conditions have revealed that significant structural instabilities become relevant during the creep process. As a result of the continuous ripening of the carbide precipitates the density of carbide pinned dislocations, which are assumed to provide an important contribution to strength, decreases as the creep process advances. In correlation with creep crack formation, a nitriding effect can occur during long term testing in air which is accompanied by an increase of the creep resistance.

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References

VISWANATHAN

: Metall. Trans., 1977, 8A, 877.

Le MAY

: Paper no. 67-WA-Met-14; 1967, New York, American Society for Mechanical Engineers.

Le MAY

, TRUSS

K. J.

, and SETHL

P. S.

: J. Basic Eng., 1969, 91D, 575.

NIFLOM

and SCHIRRA

: Z. Metallkd., 1969, 60, 879.

BETZ

: thesis, Technische Fakultät der Universität Erlangen, 1971.

JAMIESON

, GULVIN

T. F.

, BAIRD

J. D.

, BARR

R. R.

, and PRESTON

R. R.

: in ‘Creep strength in steel and high-temperature alloys’, 196; 1974, London, The Metals Society.

BAIRD

J. D.

, JAMIESON

, PRESTON

R. R.

, and COCHRANE

R. C.

: in ‘Creep strength in steel and high-temperature alloys’, 207; 1974, London, The Metals Society.

FINKELNBURG

and ILSCHNER

: Arch. Eisenhiittenwes., 1976, 4, 235.

BORGGREEN

and THC

A. R.

: ILEN: Metall. Trans., 1976, 7A, 1615.

10.

ROBERT

and SILVANT

: in Proc. 4th Int. Conf. on ‘Strength of metals and alloys’, (ed. Laboratoire de Physique du Solide), 1268; 1976, Nancy, France.

11.

SINGER

and MUM

: Z. Metallkd., 1977, 68, 328.

12.

MORRIS

D. G.

and HARRIES

D. R.

: Met. Sci., 1978, 12, 525.

13.

BLUM

and SINGER

: Z. Metallkd. 1980, 71, 312.

14.

DAVIES

P. W.

, NELMES

, WILLIAMS

K. R.

, and WILSHIRE

: Met. Sci. J., 1973, 7, 87.

15.

BERGMAN

and LAGNEBORG

: Jernkontorets Ann., 1971, 155, 368.

16.

LAGNEBORG

: Scr. Metall., 1973, 7, 605.

17.

LAGNEBORG

and ATTERMO

: Mater. Sci., 1969, 4, 195.

18.

LANGDON

T. G.

: Philos. Mag. 1970, 22, 689.

19.

NILSSON

J. O.

and DUNLOP

G. L.

: in Proc. 4th Int. Conf. on ‘Strength of metals and alloys’, (ed. Laboratoire de Physique du Solide), 885; 1976, Nancy, France.

20.

LAGNEBORG

and BERGMANN

: Met. Sci., 1976, 10, 20.

21.

THREADGILL

P. L.

and WILSHIRE

: in ‘Creep strength in steel and high-temperature alloys’, 8; 1974, London, The Metals Society.

22.

WILLIAMS

K. R.

and WILSHIRE

: Met. Sci. J., 1973, 7, 176.

23.

PARKER

J. D.

and WILSHIRE

: Met. Sci., 1975, 9, 248.

24.

DENNISON

J. P.

, HOLMES

P. D.

, and WILSHIRE

: Mater. Sci. Eng., 1978, 33, 35.

25.

EVANS

W. J.

and HARRISON

G. F.

: Met. Sci., 1979, 13, 641.

26.

EVANS

H. E.

and KNOWLES

: Met. Sci., 1980, 14, 262.

27.

BURT

, DENNISON

J. P.

, and WILSHIRE

: Met. Sci., 1979, 13, 295.

28.

SMITH

A. F.

and GIBBS

G. B.

: Met. Sci. J., 1969, 3, 93.

29.

LAGNEBORG

: Met. Sci. J., 1969, 3, 18.

30.

CASS

T. R.

and ACHTER

M. R.

: Trans. AIME, 1962, 224, 1115.

31.

SHAHINIAN

: Trans. ASME, 1965, 87D, 344.

32.

KLUEH

R. K.

: Mater. Sci. Eng., 1978, 35, 239.

Creep–structural relationship in steel alloy 800 H at 900–1000°C

Abstract

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