|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Development of High Strength Hot Corrosion Resistant Single Crystal Superalloys Based on Understanding the Effect of Key Elements on Hot Corrosion Behavior
||Jianxiu Chang, Dong Wang, Langhong Lou, Jian Zhang
|On-Site Speaker (Planned)
Hot corrosion behavior of several Ni-base single crystal (SX) superalloys with different Cr, Ta and Re contents was investigated using the “deposit recoat” method at 900 oC. It was shown that both Re and Ta can improve the hot corrosion resistance of SX superalloys. The advantage to hot corrosion properties of adding Ta depended on Cr content in the superalloys. Ta was found to exhibit a beneficial effect by promoting the formation of NaTaO3 and TaS2, and therefore inhibiting the formation of liquid Na2MoO4 and Ni-sulfides. Re may alter the activities of elements, and therefore delay the deformation and cracking of the oxide scale, and may enable the self-healing of oxide scale. Based on understanding the hot corrosion mechanism of superalloys, we have developed the first and second generation hot corrosion resistant SX superalloy (DD410 and DD420), which exhibit good high temperature strength, microstructural stability and hot corrosion resistance.
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