A power law model for the flow stress and strain-rate sensitivity in CP titanium
- Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering
Using the power law equation, {sigma}* = {sigma}*{sub 0} {times} ({dot {epsilon}}/{dot {epsilon}}{sub 0}){sup RT/Ho}, the material parameters for a CP titanium system were evaluated with values {sigma}*{sub 0} = 1,324 MPa, {dot {epsilon}}{sub 0} = 4.01 {times} 10{sup 7} s{sup {minus}1}, and H{sup 0} = 50, 160 J/mol. The resulting power law equation was able to yield curves that followed the temperature dependence of the internal stress, the total flow stress and the strain-rate sensitivity S with considerable precision to approximately 500 K. It was also demonstrated that it is possible to explain quantitatively the plateau in the flow stress-temperature diagram above 500 K by assuming the flow stress in this region is the sum of three component stresses; the internal stress, the effective stress and a dynamic strain aging stress due to oxygen. It was further shown that a drop in the strain rate sensitivity parameter, S, at 650 K could be explained by the present treatment.
- OSTI ID:
- 99244
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 1 Vol. 33; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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