|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||C-15: Study on the Undercoolability and Single Crystal Castability of Nickel-Based Superalloys
||Wang Haiwei, Ma De-Xin, Yang Gong-xian, Gong Xiu-fang, Zhang Qiong-yuan
|On-Site Speaker (Planned)
The critical undercooling degree (ΔTN) of nickel-based superalloys has a great relationship with the single crystal castability. This experiment studied the ΔTN of DD483, CMSX-4 and CMSX-6, also analyzed the factors affecting ΔTN, including chemical composition, shell materials and remelting cycle. The results show that when experiment conditions of pouring temperature and shell materials remains the same, three kinds of superalloys have different undercoolability, and the order of the critical nucleation undercooling degree from high to low is CMSX-6, CMSX-4, DD483. Because of the influence of wettability between alloy melt and shell, ΔTN of CMSX-4 in the pure Al2O3 shell is greater than which in EC95 mould (95% pure corundum + 5% quartz). With increasing the number of remelting, shell aging may pollute the alloy melt, leading to a decline in the undercoolability of the alloy.
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