Vdm Metals International Gmbh

Ali Aghajani

Jutta Kloewer

Julia Kraemer Geb Rosenberg

A method produces semi-finished products from a nickel-based alloy having the composition (in wt. %): Ni&#x3e;50-&#x3c;55%, Cr&#x3e;17-&#x3c;21%, Nb&#x3e;4.8-&#x3c;5.2%, Mo&#x3e;2.8-&#x3c;3.3%, Ti&#x3e;0.8-&#x3c;1.15%, Al&#x3e;0.4-&#x3c;0.6%, C maximum 0.045%, Co maximum 1.0%, Mn maximum 0.35%, Si maximum 0.35%, S maximum 0.01%, Cu maximum 0.3%, the remainder iron and unavoidable impurities. B 0.0001-0.01%, P 0.0001-0.02% are added. In the method: the alloy is melted, or remelted, to produce preliminary products that then undergo a hot-forming process and subsequently undergo a multi-stage annealing and aging treatment, a solution heat treatment being carried out between 1000 and 1100&#xb0; C. for 1-3 hours, then cooled in air, water or oil, and made to undergo a precipitation hardening process between 650&#xb0; C.-&#x3c;770&#xb0; C. for 5-9 hours, then cooled to room temperature, the intermediate products undergoing, if necessary, at least one further heating process.

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Bochum, Germany

Ali Aghajani