Characterization of Hot Deformation Behavior and Processing Maps of Ti–19Al–22Mo Alloy

• Published in: Metals and materials international Vol. 25; no. 4; pp. 1063 - 1071
• Main Authors: Narayana, P. L., Li, Cheng-Lin, Hong, Jae-Keun, Choi, Seong-Woo, Park, Chan Hee, Kim, Seong-Woong, Kim, Seung Eon, Reddy, N. S., Yeom, Jong-Taek
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.07.2019; Springer Nature B.V; 대한금속·재료학회
• Subjects: Artificial neural networks; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compression tests; Computer simulation; Deformation; Domains; Dynamic recrystallization; Dynamic stability; Engineering Thermodynamics; Flow stability; Heat and Mass Transfer; Isothermal flow; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mathematical models; Metallic Materials; Parameter identification; Process mapping; Processes; Solid Mechanics; Strain rate; Thermal simulation; Thermal simulators; Titanium base alloys; True strain; Yield strength; 재료공학; Hot compression test; Processing map; Ti–19Al–22Mo alloy; Microstructure; Artificial neural networks
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-018-00237-4

The isothermal compression tests were carried out to study the hot deformation behavior and microstructure evolution of Ti–19Al–22Mo alloy. The samples were deformed in the temperature range from 1100 to 1250 °C with an interval of 50 °C, strain rate ranging from 0.01 to 1 s −1 and the height reduction of 50% using Gleeble-3800 thermal–mechanical simulator. By using this experimental data an artificial neural network (ANN) model was developed and evaluated with unseen data. Further, the developed ANN model was used to predict flow stress correction from adiabatic heating at finer intervals of strain rates and temperatures. The predicted isothermal flow stress values were utilized to construct processing maps for Ti–19Al–22Mo alloy at true strain of 0.4 and 0.6. The maximum efficiency was noticed at 1100 °C with the strain rate of 0.01 s −1 associated with dynamic recrystallization and dynamic recovery. The deformation conditions of the instability domains in processing map showed wedge cracking and flow localization. Using the processing maps safe working parameters for hot deformation of Ti–19Al–22Mo alloy was identified.