Effect of Cooling Rate and Aging Process on Wear Behavior of Deformed TC21 Ti-Alloy

Abstract:

TC21 with a composition of Ti-6Al-3Mo-1.9Nb-2.2Sn-2.2Zr-1.5Cr is considered a new titanium alloy that is used in aerospace applications as a replacement for the famous Ti-6Al-4V alloy due to its high strength-to-weight ratio, high operating temperature and corrosion resistance. In this study, two different solution treatment techniques were applied on TC21 samples. Solution treatment was applied using two step heating at 1000/800 °C for 15 min each and then cooled using water quenching or air cooling to see the effect of cooling rate on microstructure as well as mechanical properties. The solution treated samples were divided into two groups; one was tested as solution treated samples without aging. While, the second group was aged at 575 °C for 4 hrs. Maximum hardness of 442 HV was observed for the water quenched and aged samples, while the minimum hardness of 340 HV was obtained for water quenched samples without aging. The lowest wear rate was obtained for water quenched and aged samples. However, the highest wear rate was reported for the samples solution treated and water quenched without aging.

• Periodical: Key Engineering Materials (Volume 835)
• Pages: 265-273
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.835.265
• Online since: March 2020
• Authors: Ramadan N. Elshaer*, Khaled M. Ibrahim, Ibrahim Lotfy, Mahmoud Abdel-Latif
• Keywords: Aging, Cooling Rate, Hardness, Microstructure, TC21 Ti-Alloy, Wear

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