METHOD OF RESTORATION OF MECHANICAL PROPERTIES OF CAST INCONEL 718 FOR SERVICED AIRCRAFT COMPONENTS

摘要

METHOD FOR RESTORATION OF MECHANICAL PROPERTIES OFCAST INCONEL 718 FOR SERVICED AIRCRAFT COMPONENTSABSTRACTA heat treatment process that will restore the mechanical properties of an aircraft engine article that includes a cast Inconel 718 portion welded to a wrought portion. The heat treatment process includes placing an article that includes the Inconel 718 cast portion into a heat treatment chamber, evacuating the chamber to a suitable atmosphere, heating the chamber in a manner that minimizes distortion of the cast portion to a temperature in the range of 1950[err]F to 2050[err]F ( 1060 – 1120[err]C), holding the temperature in that range for a period of time sufficient to solution a11 the delta phase precipitates, and then cooling the article to room temperature in a manner that minimizes distortion of the article. After solution heat treatment, the wrought portion of the engine part can be removed and replaced and the engine article can be reprocessed.Fig. 1