Varestraint Weldability Testing of ATI 718Plus®—Influence of Eta Phase

This study investigates the effect of eta phaseEta phase on hot crackingHot cracking susceptibility of ATI 718Plus®ATI 718Plus®. Two heat treatmentHeat treatment conditions of 950 °C/1 h and 950 °C/15 h having different amounts of eta phaseEta phase were tested by longitudinal Varestraint testingVarestraint testing method. The heat treatmentHeat treatment at 950 °C/15 h exhibited the highest amount of crackingCracking. This was related to the higher amount of eta phaseEta phaseprecipitationPrecipitation during the long dwell heat treatmentHeat treatment which aided to extensive liquation during weldingWelding.