PSI - Issue 14

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Procedia Structural Integrity 14 (2019) 782–789

2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Temperature and Cooling Rates on the α+β Morphology of Ti-6Al-4V Alloy Afroz Shaikh a* , Santosh Kumar a , Ashish Dawari a , Shreyas Kirwai a , Atul Patil a , Rajkumar Singh a a Kalyani Centre for Technology & Innovation, Bharat Forge Ltd, Pune- 411036, India 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. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Temperature and Cooling Rates on the α+β Morphology of Ti-6Al-4V Alloy Afroz Shaikh a* , Santosh Kumar a , Ashish Dawari a , Shreyas Kirwai a , Atul Patil a , Rajkumar Singh a a Kalyani Centre for Technology & Innovation, Bharat Forge Ltd, Pune- 411036, India Abstract Ti-6Al-4V is a dual pha e (α+β) tita iu alloy widely u ed in aerospace industry. Mech ical prop rties of a component strongly de end upon ts microstructure and mor h logy. D sired mech nical properti s can be achieved by the development of app priate microstructure wit the help of differ heat treatments and eformation. In th present w rk, dif erent s obtained through d fferent h t treatment p oces es are studi d and presented. A variety of morphologies of α+β microstructure are btain d by heating above and below β transus tempera ure and cooling at diff rent rates i. . ater quench, air cool and furnace cool. He ting above β transus and cooling with different rat s results into lamellar str cture whereas a duplex m cr s ructure is obt ined fter hea ing below β transus and cooling with differ nt rat s. A lamell r tructure with blocky acicular α is ob a ned after heating above β ransus followed by furnace cool up to temperature below β transus and cooling wi h different r tes. It is observed that cooling rate has a significant effect on hardness of heat treated sample. Faster cooling results in higher hardness. © 2018 The Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

Keywords: Ti-6Al-4V; Martensite ά ; Primary α; Tranformed β; Microstructure evolution. Keywords: Ti-6Al-4V; Martensite ά ; Primary α; Tranformed β; Microstructure evolution.

*Corresponding author. Tel.: 020-6727-1991 E-mail address: afroz.shaikh@bharatforge.com *Correspon ing auth r. Tel.: 020-6727-1991 E-mail address: afroz.shaikh@bharatforge.com

2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.07.056