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Abstract

Diffusion of chromium in a duplex stainless steel containing ∼8% ferrite has been investigated in the temperature range 873–1273 K using the standard serial sectioning technique. The resulting concentration profiles exhibited up to four distinct regions. The two main regions are attributed to volume diffusion in the austenite and ferrite phases, the other zones being due to short-circuiting paths. Volume diffusion in the austenite phase is in good agreement with Cr diffusion in Type 316 steel. The Cr diffusion coefficient in the ferrite phase of approximate composition 25Cr-5 wt.-%Ni is given by:

Dα = (6.0⁺¹¹₋₃) X 10⁻⁶ (- 212± 5/RT) m²s⁻¹

the activation energy being expressed in kJ mol⁻¹. Little evidence was found for enhanced Cr diffusion along austenite/ferrite interface boundaries.

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References

WAGNER

: Phil. Mag., 1954, 45, 1225.

HALES

, SMITH

A. F.

, and KILLEEN

J. C.

: B.N.E.S. Int. Conf. Corr. Steels in CO2, (Reading), 1974, 311.

BONDY

, REGNIER

, and LEVY

: Sci. Metall., 1971, 5, 345.

AARON

H. B.

and WEINBERG

: Acta Met., 1972, 20, 339.

SMITH

A. F.

: Metal Sci., 1975, 9, 375.

HART

E. W.

: Acta Met., 1957,5, 597.

WHIPPLE

R. T. P.

: Phil. Mag., 1954, 45, 1225.

SUZUOKA

: Trans. Japan Inst. Metals, 1961, 2, 25.

SUZUOKA

: J. Phys. Soc. Japan, 1964, 19, 839.

10.

MINKES

and WUTRIO

: Phys. Rev. B, 1970,2, 1619.

11.

MINKES

and wurriG

: J. Appl. Phys., 1970, 41, 3205.

12.

DIRKS

A. G.

and MEIJERING

J. L.

: Acta Met., 1972, 20, 1101.

13.

FISHER

J. C.

: J. Appl. Phys., 1951,22, 74.

14.

LEVINE

H. S.

and MacCULLUM

C. J.

: ibid., 1960, 31, 595.

15.

SHADE

J. S.

and SPEIGHT

M. V.

: unpublished work.

16.

LONG

C. J.

and DELONG

W. T.

: Weld. J. (Miami, Fla., USA), 1973, 52, 281s.

17.

PERKINS

R. A.

, PADGETT

R. A.

, and TUNALI

N. K.

: Metall. Trans., 1973, 4, 2535.

18.

ROBINSON

J. T.

and PETERSON

N. L.

: Surface Sci., 1972, 31, 586.

19.

ASKILL

: Physica Status Solidi (a), 1971, 8, 587.

20.

SMITH

A. F.

: Metal Sci., 1975, 9, 425.

21.

GHOSHTAGORE

R. N.

: Phys. Rev., 1967, 155, 603.

22.

SMITH

A. F.

and GIBBS

G. B.

: Metal Sci. J., 1968, 2, 47.

23.

BOWEN

A. W.

and LEAK

G. M.

: Metall. Trans., 1970, 1,2767.

24.

ALBERRY

P. J.

and HAWORTH

C. W.

: Metal Sci., 1974, 8, 407.

25.

and WEATHERLY

G. C.

: Acta Met., 1975, 23, 1451.

26.

JOB

, MATHIE

and REGNIER

: ibid., 1974, 22, 1197.

The diffusion of chromium in a duplex alloy steel

Abstract

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References