|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Microstructure Evolution of Ti-45Al-8.5Nb-(W, B, Y) Alloy during Continuous Cooling and Thermal Aging
||Jieren Yang, Bei Cao, Xuyang Wang, Rui Hu, Lin Song, Jinshan Li
|On-Site Speaker (Planned)
Continuous cooling widely occurs in hot working processes including casting, forging and welding, et al. The phase transformation behaviour of Ti-45Al-8.5Nb-(W, B, Y) alloy during continuous cooling under various cooling rates of 5 K/min, 20 K/min, 100 K/min, 700 K/min and water-quenching (WQ) was investigated in this study. Results indicate that the microstructure is highly dependent on the cooling rate and thermal history. At low cooling rate, full lamellar microstructure with the average colony size of 150 μm forms and few massive phases exsit at colony boundaries. With the increase of cooling rate, the lamellar morphology gradually weakens and more non-equilibrium phases such as massive B2 and γ emerge. A mass of lath martensite was obtained after WQ. Further, the thermal stability in intermediate temperature range of these samples obtained by different cooling processes was studied.
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