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A wide variety of rnicrostructurcs may be developed in wrought IN7 18. While billet chemistry and thermoinechanical process history directly relate to the resulting gcneral microstructure it may be difficult at times to understand how particular structures were fonned. The appearancc, morphology and control of 6 phase are of special interest because of its critical influence on grain structure, grain size and mechanical properties. This paper reviews the evolution of ~nicrostructure during the deformation and heat treatment oS plate rolled samples with the goal of increasing the understanding of how different morphologies of 6 may fonn and how they will respond to further processes. Processing began with a forging heat treated above the 6 solvus and then either exposed to a 8 precipitation cycle followed by sub 6 solvus rolling or rolled below the 6 solvus followed by 6 precipitation. Qualitative evaluations of the resulting ~nicrostructures provide insight into the mechanisms controlling the development and morphology of 6 phase. Consideration will also be given to processes for evaluating uniformity in IN718 forgings. The information presented may assist those involved in the manufacture and use of IN7 18 articles where microstructure control is sought. Superdlo> a 71 8. 635. 706 and Various Derivatives Edited b) E.i\. Loria TMS ( T h e hlinerals. hletals Oic. Materials Society). 20U1

Observations on the Development of Delta Phase in IN718 Alloy