SUPERALLIAGE SOUDABLE A BASE DE NICKEL

La présente invention concerne un superalliage à base de nickel ayant une composition nominale de 19,5% de Cr, 13,5% de Co, 3,75% de Mo, 3,0% de Ti, 1,12% d'Al, 0,005% de B, 0,006% de C et contenant jusqu'à 2,0% de fer. Cet alliage est caractérisé par le perfectionnement qui consiste à limiter la teneur en fer à au plus 0,2%, si bien que la soudabilité de pièces moulées réalisées à partir de l'alliage est notablement accrue. Weldable Cast Nickel Base Superalloy Nickel base superalloys of the type referred to as Waspaloy are rendered weldable by limiting the iron content to about one twentieth of that which is commonly present, adding small amounts of manganese to the alloy and removing the zirconium which is commonly present. In addition, the sulfur, bismuth and lead levels are held to the lowest possible limits, and preferably the aluminum and molybdenum are maintained in the lower half of their normal range. By implementing these alloying strategies, the weldability of the cast material is dramatically improved and for the first time castings of the Waspaloy materials are rendered consistently weldable on a commercial scale.