Alstom Technology Limited

Alstom (switzerland) Ltd

Alkan Goecmen

Reinhard Fried

Abdus Suttar Khan

Peter Ernst

A process for producing a spatially shaped carrier layer () which is of foil-like design from hard brittle material includes:

Process for producing a spatially shaped carrier layer

The invention describes a temperature-stable protective coating over a metallic substrate surface ( ), which coating includes at least one layer of material ( ) consisting of MCrAlY, where M represents at least one of the elements selected from the group of materials consisting of Fe, Co and Ni. The invention also describes a production process for this coating. The invention is distinguished by the fact that a multiplicity of local elevations, known as rivets ( ), are provided distributed directly over the area of the substrate surface ( ) or distributed indirectly over the area of the substrate surface, separated from the substrate surface ( ) by means of at least one interlayer ( ), which rivets are fixedly joined to the substrate surface ( ) or the interlayer ( ), that at least one layer of material ( ) consisting of MCrAlY is deposited on the substrate surface ( ) or interlayer ( ) in such a manner that the layer of material ( ) consisting of MCrAlY completely surrounds the rivets ( ), completely fills regions which lie between adjacent rivets ( ) and projects above the rivets ( ).

Temperature stable protective coating over a metallic substrate surface

The invention relates to a transformation controlled nitride precipitation hardening heat-treatable steel with the following composition (data in wt. %): 15-18 Cr, max. 0.5 Mn, 4-10 Ni, max. 15 Co, max. 4 W, max. 4 Mo, 0.5-1 V, at least one of Nb, Ta, Hf and Zr totaling between 0.001-0.1, 0.001-0.05 Ti, max. 0.5 Si, max. 0.05 C, 0.13-0.25 N, max. 4 Cu, rest iron and usual impurities, under the condition that the weight ratio of vanadium to nitrogen V/N is in the range between 3.5 and 4.2. The invention also relates to a heat treatment process for this steel. Very good strength, ductility and also corrosion resistance can be attained.

Transformation controlled nitride precipitation hardening heat treatable steel

The invention relates to a martensitic-hardenable heat-treated steel, having the following composition (data in % by weight): 9 to 13% Cr, 0.001 to 0.25% Mn, 2 to 7% Ni, 0.001 to 8% Co, at least one of W and Mo in total between 0.5 and 4%, 0.5 to 0.8% V, at least one of Nb, Ta, Zr and Hf in total between 0.001 and 0.1%, 0.001 to 0.05% Ti, 0.001 to 0.15% Si, 0.01 to 0.1% C, 0.12 to 0.18% N, at most 0.025% P, at most 0.015% S, at most 0.01% Al, at most 0.0012% Sb, at most 0.007% Sn, at most 0.012% As, remainder iron and customary impurities, and the proviso that the ratio by weight of vanadium to nitrogen V/N lies in the range between 3.5 and 4.2. After solution annealing at 1050 to 1250&deg; C., cooling to a temperature below 300&deg; C., tempering treatment, partial or complete reaustenitization at 600 to 900&deg; C., cooling to a temperature below 300&deg; C. and annealing at a temperature from 550 to 650&deg; C., it has a high resistance to heat combined, at the same time, with a high ductility.

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Baden-Dättwil, Switzerland

Alkan Goecmen