Simulation of the flow strength and microstructure of titanium aluminide in hot forging

M. C. Abernathy; R. A. Mirsham; A. Raman; B. Q. Li; A. A. Wereszczak

doi:10.1023/A:1012538321074

Simulation of the flow strength and microstructure of titanium aluminide in hot forging

M. C. Abernathy, R. A. Mirsham, A. Raman, B. Q. Li, A. A. Wereszczak

Mechanical Properties and Mechanics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The main purpose of this investigation is to develop a mathematical relationship for the flow strength based on microstructure evolution during the hot forming of titanium aluminide. For engineering applications, gamma titanium-aluminide which is composed of 46-50 at.% Al is desired in a duplex grain microstructure. Thermomechanical processing of this alloy requires a temperature of 0.60-0.75 T_M (melting point) in order to properly control the microstructure and grain growth. Compression tests were conducted in the temperature range between 950-1100°C at strain rates of 0.001/s and 0.1/s to develop a duplex phase microstructure, gamma with 5-20% α₂. By using the experimental data, mathematical relationships were verified for different stages of hardening, recovery, recrystallization, and grain growth. The simulation was based on the theory used in the Sandstrom and Lagneborg model and the numerical analysis approach developed by Pietrzyk. The simulation proved that the model and numerical simulation well-presented the compression deformation of titanium-aluminide alloys at constant strain rates.

Original language	English
Pages (from-to)	5697-5704
Number of pages	8
Journal	Journal of Materials Science
Volume	36
Issue number	23
DOIs	https://doi.org/10.1023/A:1012538321074
State	Published - Dec 1 2001

Funding

This research was partially supported by NASA-John Glenn Research Center, Cleveland, Ohio under the grant number NAG3-1825 from. The research at ORNL is sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC for the U.S. Department of Energy under contract number DE-AC05-000R22725.

Funders	Funder number
NASA-John Glenn Research Center, Cleveland, Ohio	NAG3-1825
Office of Transportation Technologies
U.S. Department of Energy	DE-AC05-000R22725
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
UT-Battelle

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abstract = "The main purpose of this investigation is to develop a mathematical relationship for the flow strength based on microstructure evolution during the hot forming of titanium aluminide. For engineering applications, gamma titanium-aluminide which is composed of 46-50 at.% Al is desired in a duplex grain microstructure. Thermomechanical processing of this alloy requires a temperature of 0.60-0.75 TM (melting point) in order to properly control the microstructure and grain growth. Compression tests were conducted in the temperature range between 950-1100°C at strain rates of 0.001/s and 0.1/s to develop a duplex phase microstructure, gamma with 5-20% α2. By using the experimental data, mathematical relationships were verified for different stages of hardening, recovery, recrystallization, and grain growth. The simulation was based on the theory used in the Sandstrom and Lagneborg model and the numerical analysis approach developed by Pietrzyk. The simulation proved that the model and numerical simulation well-presented the compression deformation of titanium-aluminide alloys at constant strain rates.",

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AU - Raman, A.

AU - Li, B. Q.

AU - Wereszczak, A. A.

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N2 - The main purpose of this investigation is to develop a mathematical relationship for the flow strength based on microstructure evolution during the hot forming of titanium aluminide. For engineering applications, gamma titanium-aluminide which is composed of 46-50 at.% Al is desired in a duplex grain microstructure. Thermomechanical processing of this alloy requires a temperature of 0.60-0.75 TM (melting point) in order to properly control the microstructure and grain growth. Compression tests were conducted in the temperature range between 950-1100°C at strain rates of 0.001/s and 0.1/s to develop a duplex phase microstructure, gamma with 5-20% α2. By using the experimental data, mathematical relationships were verified for different stages of hardening, recovery, recrystallization, and grain growth. The simulation was based on the theory used in the Sandstrom and Lagneborg model and the numerical analysis approach developed by Pietrzyk. The simulation proved that the model and numerical simulation well-presented the compression deformation of titanium-aluminide alloys at constant strain rates.

AB - The main purpose of this investigation is to develop a mathematical relationship for the flow strength based on microstructure evolution during the hot forming of titanium aluminide. For engineering applications, gamma titanium-aluminide which is composed of 46-50 at.% Al is desired in a duplex grain microstructure. Thermomechanical processing of this alloy requires a temperature of 0.60-0.75 TM (melting point) in order to properly control the microstructure and grain growth. Compression tests were conducted in the temperature range between 950-1100°C at strain rates of 0.001/s and 0.1/s to develop a duplex phase microstructure, gamma with 5-20% α2. By using the experimental data, mathematical relationships were verified for different stages of hardening, recovery, recrystallization, and grain growth. The simulation was based on the theory used in the Sandstrom and Lagneborg model and the numerical analysis approach developed by Pietrzyk. The simulation proved that the model and numerical simulation well-presented the compression deformation of titanium-aluminide alloys at constant strain rates.

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Simulation of the flow strength and microstructure of titanium aluminide in hot forging

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