2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys

Editors:Kongoli F, Conejo A, Gomez-Marroquin MC
Publisher:Flogen Star OUTREACH
Publication Year:2017
Pages:242 pages
ISBN:978-1-987820-77-5
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Investigation of Adiabatic Heat Rise and its Effect on Flow Stresses and Microstructural Changes During High Strain Rate Deformation of Ti6Al4V Alloy

    Ashish Dawari1; B.P. Kashyap2; R.K.P. Singh2;
    1BHARAT FORGE LIMITED, KALYNI CENTRE FOR TECHNOLOGY & INNOVATION, Pune, India; 2, , ;
    Type of Paper: Invited
    Id Paper: 329
    Topic: 3

    Abstract:

    During high strain rate deformation, some of the plastic work is transformed into heat. The lower thermal conductivity of Ti-6Al-4V alloys does not let the generated heat to escape easily thus producing an adiabatic system. Therefore, during deformation of Ti-6Al-4V alloy temperature increases called 'Adiabatic Heating'. Adiabatic heating contributes to flow softening in the stress-strain response of the material. Adiabatic heat rise and volume fraction of a phase in this two phase alloy has a strong influence on its hot deformation behavior. Hot compression tests were conducted on Gleeble 3500 thermo-mechanical simulator with cylindrical specimens in the temperature range of 700 - 1000 °C and strain rate range of 1 - 100 s-1 up to a true strain of 0.7. Experimental results show that the flow stress of Ti-6Al-4V alloy decreases with the increase in temperature and decrease in strain rate. Temperature rise due to adiabatic heating has been measured through K-type thermocouple. Adiabatic temperature rise contributes to increase in the volume fraction of a phase. Maximum temperature rise is observed to be 103 °C at strain rate of 100 s -1 and test temperature of 700 °C. Fraction increase in a phase due to adiabatic heating has been analyzed and an attempt has been made to co-relate it with Zener- Hollomon parameter (Z). The a volume fraction increases with temperature and strain rate. Z parameter and a volume fraction relation fits well by exponential relation for a given strain rate.

    Keywords:

    Deformation; Measurement; Metallurgy; Modeling; Non-ferrous; Temperature; Titanium; Adiabatic heat rise; Gleeble 3500; A Phase; Zener-Hollomon Parameter

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    Dawari A, Kashyap B, Singh R. (2017). Investigation of Adiabatic Heat Rise and its Effect on Flow Stresses and Microstructural Changes During High Strain Rate Deformation of Ti6Al4V Alloy. In Kongoli F, Conejo A, Gomez-Marroquin MC (Eds.), Sustainable Industrial Processing Summit SIPS 2017 Volume 9. Iron and Steel, Metals and Alloys (pp. 178-189). Montreal, Canada: FLOGEN Star Outreach