Iron-based shape memory and vibration damping alloys...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/04 (2006.01) C22C 38/38 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2225679

The invention concerns a steel composition, in which, in addition to iron and manganese, there is possibly silicon, and in which nitrogen is an essential part. The composition may also include such conventional elements that are used in metallurgy to improve the desired properties. The composition contains, in addition to iron, (in percentages by weight) Mn 5.0-50.0 %, Si 0- 8.0 % and N 0.01-0.8 %, as well as, if desired, one or more of the following elements: Cr 0.1-20.0 %, Ni 0.1-20.0 %, Co 0.1-20.0 %, Cu 0.1-3.0 %, V 0.1-1.0 %, Nb 0.1-1.0 %, Mo 0.1-3.0 %, C 0.001-1.0 %, rare earth metals (e.g. Sc, Y, La, Ce) 0.0005-0.02 %, and that it fulfils the following equation: Ni + Co + 0.5Mn + O.3Cu + 20N + 25C>=0.3 x (Cr + 2Si + 5V + 1.5Nb + 1.5Mo). The composition has good shape memory and damping properties, as well as mechanical and corrosion resistance properties.

L'invention concerne une composition d'acier dans laquelle, outre le fer et le manganèse, il peut y avoir du silicium et dont l'azote constitue une part essentielle. Cette composition peut également contenir des éléments classiquement utilisés en métallurgie pour améliorer les propriétés recherchées. Elle contient, outre le fer, (en pourcentage en poids) Mn 5,0-50 %, Si 0-8,0 % et N 0,01-0,8 %, ainsi que, si désiré, un ou plusieurs des éléments suivants: Cr 0,1-20,0 %, Ni 0,1-20,0 %, Co 0,1-20,0 %, Cu 0,1-3,0 %, V 0,1-1,0 %, Nb 0,1-1,0 %, Mo 0,1-3,0 %, C 0,001-1,0 %, terres rares (par exemple Sc, Y, La, Ce) 0,0005-0,02 %, conformément à l'équation suivante: Ni + Co + 0,5Mn + 0,3Cu + 20N + 25C>=m(G) 0,3x(Cr + 2Si + 5V + 1,5Nb + 1,5Mo). Cette composition possède une bonne mémoire de forme et de bonnes propriétés d'amortissement, ainsi que des propriétés de résistance mécanique et de résistance à la corrosion.

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