Minimization of quench cracking of superalloys

Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal

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148410, 148676, 428680, B23K 2000, B23K 300, C22C 1900

Patent

active

052698572

ABSTRACT:
A method for preparing a heat-treated article made of a superalloy, such as a turbine disk preform, includes furnishing an article made of a superalloy that is prone to quench cracking, usually after forging the article, and thereafter covering at least a portion of the article with a quench cladding having a thickness of at least about 1/8 inch so that the quench cladding is in direct thermal contact with the article. The quench cladding may be conveniently applied to the article by thermal spraying, which produces direct thermal contact between the quench cladding and the article, or by placing the article into the envelope of the quench cladding material and hot isostatically pressing to achieve a direct thermal contact between the envelope and the article. After the quench cladding is in place, the clad article is heated to elevated temperature and quenched from the elevated temperature to a lower temperature, and the envelope is removed. By reducing the thermal gradient at the surface of the article and by reducing the oxidation embrittlement of the surface of the article, the quench cladding aids in reducing the incidence and severity of quench cracks. The quench cladding may be applied over the entire surface of the article, or only over the most crack-prone regions.

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