Methods of forming dual microstructure components

摘要

Methods of forming dual microstructure components include consolidating a powder material comprising an alloy to form a billet, the billet having a first grain structure, inductively heating the billet at an inductive heat treat temperature above a gamma prime solvus temperature of the alloy and subjecting the billet to a subsolvus heat treat temperature that is below the gamma prime solvus temperature of the alloy, waiting a period of time for the first grain structure in an outer portion of the billet to transform into a second grain structure that is coarser than the first grain structure, after the steps of inductively heating and subjecting the billet to the subsolvus heat treat temperature. The methods also include dividing the billet into at least two sections, and machining a final shape into one or more of the at least two sections to form the dual microstructure component.

主权项

1. A method of forming a dual microstructure component, the method comprising the steps of:
consolidating a powder material comprising an alloy via HIP processing and/or extrusion to form a solid, cylindrical billet having an axial length from about 1 meter to about 3 meters, the billet having a first grain structure; inductively heating the solid, cylindrical billet at an inductive heat treat temperature above a gamma prime solvus temperature of the alloy and subjecting the solid, cylindrical billet to a subsolvus heat treat temperature that is below the gamma prime solvus temperature of the alloy in a range of about 3.5° C. to about 25° C. lower than the gamma prime solvus temperature of the alloy; waiting a period of time for the first grain structure in an outer portion of the solid, cylindrical billet to transform into a second grain structure that is coarser than the first grain structure, after the steps of inductively heating and subjecting the solid, cylindrical billet to the subsolvus heat treat temperature; slicing the solid, cylindrical billet into at least ten sections subsequent to the steps of inductively heating the billet and waiting a period of time; and machining a final shape into one or more of the at least ten sections to form the dual microstructure component, wherein the step of machining comprises forming a bore hole in the ten or more sections to form a turbine disk shape, and wherein the method omits isothermal forging of the at least ten sections.