Sintering transformations in mixtures of austenitic and ferritic stainless steel powders

Abstract

The microstructural transformations and the dimensional evolution of green specimens obtained by pressing mixtures of austenitic and ferritic stainless steel powders have been investigated by sintering at 1120 and 1240°C. Dilatometry experiments show that the linear shrinkage is influenced by the amount of ferritic powder. Moreover, during sintering Ni diffuses into the ferritic grains causing austenite destabilisation and the formation of a mixed constituent, whose constitution has been investigated by means of EDXS and interpreted on the basis of the Schaeffler diagram. Sigma phase also forms during sintering of the duplex mixtures.

Get full access to this article

View all access options for this article.

References

Soylu

and HONEYCOMBE

R. W. K.

: Mater. Sci. Technol., 1991, 7, 137.

Irisarri

A. M.

and ERAUZKIN

: Metall. Ital., 1996, 88, (4), 275.

Ruizprieto

J. M.

et al.: Powder Metall., 1994, 37, (1), 57.

Borg

R. J.

and DIENES

G. J.

: ‘An introduction to solid state diffusion’; 1988, San Diego, CA, Academic Press.

German

R. M.

: ‘Powder metallurgy science’, 177; 1984, Princeton, NJ, MPIF.

Marshall

: Austenitic stainless steel, microstructure and mechanical properties’, 69; 1984, Oxford, Elsevier Applied Science.

Y. MEHARA et al.: Met. Sci., 1983, 17, 541.

Nilsson

J. O.

: Mater. Sci. Technol., 1992, 8, 685.