Microstructural and mechanical effects of thermo-Mechanical processing on ati 718plus̊ contoured rings

Abstract

ATI 718Plus̊ is a nickel-base superalloy designed to promote resistance and thermal stability at elevated temperatures. Beside these properties, this material presents superior formability during forging operations, making ATI 718Plus̊ a suitable material for the manufacture of non-rotating and rotating components for jet engine and land-based turbines. Present contribution summarizes main results when several contoured rings were produced by ringrolling processes considering selected parameters as temperature and deformation ratio. Effect of solution and precipitation heat treatments on ATI 718Plus̊ microstructure and mechanical properties are also reported. These results include tensile testing at elevated temperature and stressrupture testing. Microstructural evaluations performed by optical microscopy and electronic microscopy, complement reported results. © (2011) Trans Tech Publications, Switzerland.