Constitutive Analysis of the High-Temperature Deformation Behavior of Single Phase α-Ti and α+β Ti-6Al-4V Alloy

Abstract:

The high-temperature deformation behavior of the single-phase α (Ti-7.0Al-1.5V) and α + β (Ti-6Al-4V) alloy were determined and compared within the framework of self-consistent scheme at various temperature ranges. For this purpose, isothermal hot compression tests were conducted at temperatures between 650°C ~ 950°C to determine the effect of α/β phase volume fraction on average flow stress under hot-working condition. The flow behavior of α phase was estimated from the compression test results of single-phase α alloy whose chemical composition is close to that of α phase of Ti-6Al-4V alloy. On the other hand, the flow stress of β phase in Ti-6Al-4V was predicted by using self-consistent method. The flow stress of α phase was higher than that of β phase above 750°C, while the β phase revealed higher flow stress than α phase at 650°C. Also, at temperature above 750°C, the predicted strain rate of β phase was higher than that of α phase. It was found that the relative strength between α and β phase significantly varied with temperature.

• Periodical: Materials Science Forum (Volumes 539-543)
• Pages: 3607-3612
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.539-543.3607
• Online since: March 2007
• Authors: Jeoung Han Kim, Jong Taek Yeom, Nho Kwang Park, Chong Soo Lee
• Keywords: Deformation Behavior, High Temperature Strength, Phase Volume Fraction, Self-Consistent, Ti₆Al₄V Alloy, TiAl

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