During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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.
Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical prop... more Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical properties of a component strongly depend upon its microstructure and morphology. Desired mechanical properties can be achieved by the development of appropriate microstructure with the help of different heat treatments and deformation. In the present work, different microstructures obtained through different heat treatment processes are studied and presented. A variety of morphologies of α+β microstructure are obtained by heating above and below β transus temperature and cooling at different rates i.e. water quench, air cool and furnace cool. Heating above β transus and cooling with different rates results into lamellar structure whereas a duplex microstructure is obtained after heating below β transus and cooling with different rates. A lamellar structure with blocky acicular α is obtained after heating above β transus followed by furnace cool up to temperature below β transus and cooling with different rates. It is observed that cooling rate has a significant effect on hardness of heat treated sample. Faster cooling results in higher hardness.
Abstract Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechan... more Abstract Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical properties of a component strongly depend upon its microstructure and morphology. Desired mechanical properties can be achieved by the development of appropriate microstructure with the help of different heat treatments and deformation. In the present work, different microstructures obtained through different heat treatment processes are studied and presented. A variety of morphologies of α+β microstructure are obtained by heating above and below β transus temperature and cooling at different rates i.e. water quench, air cool and furnace cool. Heating above β transus and cooling with different rates results into lamellar structure whereas a duplex microstructure is obtained after heating below β transus and cooling with different rates. A lamellar structure with blocky acicular α is obtained after heating above β transus followed by furnace cool up to temperature below β transus and cooling with different rates. It is observed that cooling rate has a significant effect on hardness of heat treated sample. Faster cooling results in higher hardness.
During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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.
During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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...
During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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.
Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical prop... more Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical properties of a component strongly depend upon its microstructure and morphology. Desired mechanical properties can be achieved by the development of appropriate microstructure with the help of different heat treatments and deformation. In the present work, different microstructures obtained through different heat treatment processes are studied and presented. A variety of morphologies of α+β microstructure are obtained by heating above and below β transus temperature and cooling at different rates i.e. water quench, air cool and furnace cool. Heating above β transus and cooling with different rates results into lamellar structure whereas a duplex microstructure is obtained after heating below β transus and cooling with different rates. A lamellar structure with blocky acicular α is obtained after heating above β transus followed by furnace cool up to temperature below β transus and cooling with different rates. It is observed that cooling rate has a significant effect on hardness of heat treated sample. Faster cooling results in higher hardness.
Abstract Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechan... more Abstract Ti-6Al-4V is a dual phase (α+β) titanium alloy widely used in aerospace industry. Mechanical properties of a component strongly depend upon its microstructure and morphology. Desired mechanical properties can be achieved by the development of appropriate microstructure with the help of different heat treatments and deformation. In the present work, different microstructures obtained through different heat treatment processes are studied and presented. A variety of morphologies of α+β microstructure are obtained by heating above and below β transus temperature and cooling at different rates i.e. water quench, air cool and furnace cool. Heating above β transus and cooling with different rates results into lamellar structure whereas a duplex microstructure is obtained after heating below β transus and cooling with different rates. A lamellar structure with blocky acicular α is obtained after heating above β transus followed by furnace cool up to temperature below β transus and cooling with different rates. It is observed that cooling rate has a significant effect on hardness of heat treated sample. Faster cooling results in higher hardness.
During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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.
During high strain rate deformation, some of the plastic work is transformed into heat. The lower... more 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...
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