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Home > Archive>Volume 50, Issue 10, 2021 >3427-3436. DOI:10.12442/j.issn.1002-185X.E20200039
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Influence of Hot Corrosion on Precipitation of δ Phase and Tensile Properties of GH4169 Superalloy
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Affiliation:

1.Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China;2.China Automotive Technology and Research Center Co., Ltd, Tianjin 300300, China

Fund Project:

Fundamental Research Funds for the Central Universities of Civil Aviation Universities of China (3122019177)

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    Abstract:

    The hot corrosion behavior of the superalloy GH4169 were analyzed in the salt mixture of 75Na2SO4+ 25NaCl (wt%) at 650, 750 and 850 °C for 50, 75 and 100 h. Then the precipitation of δ phase and tensile properties of the superalloy at ambient temperature were investigated. Results show that with increasing the heat treatment temperature, the ultimate tensile strength (UTS) and yield strength (YS) of the alloy exhibit a drastic degradation while elongation improves significantly. The needle-shaped δ phase precipitated at the grain boundaries can enhance the strength of the superalloy, and cause intergranular brittle fracture. As a result, the ductility of the superalloy is reduced after exposure at 750 °C. The corrosion mechanism of the alloy conforms to type-II hot corrosion at 650 and 750 °C while to type-I hot corrosion at 850 °C. Both kinds of corrosion can form a corrosion layer and promote the δ phase precipitation.

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[Song Xiaoxiao, Zhou Lv, Li Ke, Ren Kaixu, Wang Jiayu, Wang Xin. Influence of Hot Corrosion on Precipitation of δ Phase and Tensile Properties of GH4169 Superalloy[J]. Rare Metal Materials and Engineering,2021,50(10):3427~3436.]
DOI：10.12442/j. issn.1002-185X. E20200039

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History
  • Received:August 19,2020
  • Revised:January 21,2021
  • Adopted:February 03,2021
  • Online: October 28,2021
  • Published: October 25,2021

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