C. M. O'Brien, R. S. Minisandram, J. M. Hyzak, ATI Allvac, Monroe, NC
Conversion of ingot to fine-grained billet is a complex process for superalloys. The thermo-mechanical processing is effected by a range of parameters including heating temperature, transfer time to the forging die, overall forging reductions along with incremental forging reductions per pass. The effects of each individual processing parameter along with their interactions cannot be practically determined experimentally. Numerical modeling analysis, however, provides the opportunity to determine these effects analytically. Modeling results for the conversion of Alloy 718 billet will be reviewed. Thermal and strain distributions from the model are useful in predicting coarse surface structure.
Summary: Summary to come.
