kornfeinungs and optimisierungsverfahren mechanical properties for thermomechanical treatment of cast titanaluminiden below the gamma range

摘要

A method for thermomechanically processing near-gamma Ti aluminide alloy wrought prods. comprises: (a) coating a near-gamma Ti aluminide alloy ingot; (b) hot isostatic pressing (HIP'ing) (a) to seal off casting defects; (c) preparing the HIP'ed ingot into suitable forging preforms; (d) isothermally forging the forging preforms into end product preforms at forging temp. close to a phase line between alpha +gamma and alpha -2+gamma phase fields to break down the coarse ingot microstructure and to yield a largely equi-mixed gamma microstructure; and, (e) processing the end product preforms into desired wrought end products.