With today's requirements for increased productivity and tighter mechanical property and microstructural specifications imposed by customers, a good understanding of microstructural development and control is required. At Into Alloys International Inc. (IAII), a pilot mill and a production mill were used concurrently to process INCONEL alloys 625 and 718. Finite element software was used for increased understanding of thermomechanical processing (TMP) during flat rolling. As-rolled grain size and volume fraction of recrystallization were analyzed. It was determined that finishing temperature plays an important part in recrystallized grain size and that volume fraction of recrystallized grains is dependant on many factors, especially strain rate and temperature.
The purpose of this study was to evaluate a 2D finite element forge model. The code incorporates a microstructural model for prediction of recrystallized volume fraction and recrystallized grain size. Because the model assumes plane strain deformation, flat rolling provides a potential method for evaluating the microstructural model. Pilot mill rolling experiments were conducted with deformation temperatures ranging from 925°C (1700°F) to 1150°C (2 1 OO'F) and a maximum draft of -75%. The analysis of results focused on the onset of recrystallization and predictions for partial recrystallization in INCONEL@ alloy 718. The model predicts the onset of recrystallization reasonably well for most temperatures. An accelerated recrystallization rate to a fully recrystallized structure is predicted compared to experimental results.
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