The mechanical behavior of lnconel 718 processed using the Delta Process (DP) conversion technique was studied. The DP conversion sequence uses a intentional delta phase precipitation cycle and subsequent thermomechanical processing to produce uniform fine grain billet and bar stock. The process was developed to improve the mechanical properties through the elimination of occasional coarse grains which are common in conventionally processed materials. The net effect resulted in a decreased standard deviation in the mechanical properties and an increase in the minimum properties. The microstructure, tensile, low cycle fatigue, and cyclic crack growth behaviors of DP718 impeller, disk forgings and bar stock were investigated. Forged DP718 properties were compared to conventionally processed lnconel 718 and another high strength material. The DP718 bar stock properties were compared to conventionally processed lnconel 718.
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