Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1986-10-23
1988-06-14
Rutledge, L. Dewayne
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 37, 420 56, 420 57, 420 70, 428638, 428683, 428685, C22C 3830, C22C 3838
Patent
active
047510463
ABSTRACT:
An austenitic stainless steel alloy showing a high cavitation erosion resistance making it particularly useful for the manufacture and/or repair of hydraulic machine components. The alloy consists essentially of from 8 to 30% by weight of Co; from 13 to 30% by weight of Cr; from 0.03 to 2.0% by weight of C; up to 0.3% by weight of N; up to 5.0% by weight of Si; up to 1.0% by weight of Ni; up to 2.0% by weight of Mo; and up to 16% by weight of Mn, the balance being substantially Fe, with the proviso that at least one of the following conditions is satisfied: the amount of C is higher than 0.3%, and/or the amount of Si is higher than 3.0% and/or the amount of Mn is higher than 9.0%. Moreover, the amounts of the above mentioned elements that are respectively known as ferrite formers (Cr, Mo, Si) and as austenite former (C, N, Co, Ni, Mn) and amongst said austenite and ferrite formers, the amount of each of these elements that are respectively known to increase and lower the stacking fault energy, are respectively selected and balanced so that at least 60% by weight of the alloy is, at ambient temperature, in a face centered cubic phase having a stacking fault energy low enough to show a fine deformation twinning under cavitation exposure or, alternatively, to make this face centered cubic phase transformable under cavitation exposure to a hexagonal close pack .epsilon.-phase and/or a .alpha.-martensitic phase showing such a fine deformation twinning.
REFERENCES:
patent: 3772005 (1973-11-01), de Barbadillo
patent: 4588440 (1986-05-01), Simoneau
"The Role of Twinning in the Cavitation Erosion of Cobalt Single Crystals", S. Vaidya, S. Mahajan and C. M. Preece, published in Metallurgical Transactions A, vol. 11A, Jul. 1980-1139.
"A Deformation-Induced Phase Transformation Involving a Four-Layer Stacking Sequence in a Co-Fe Alloy", D. A. Woodford and H. J. Beattie, published in Metallurgical Transactions, vol. 2-11/71.
Hydro - Quebec
Rutledge L. Dewayne
Wyszomierski George
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