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High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys
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Institute of Metal Research,Chinese Academy of Sciences

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    Abstract:

    High temperature oxidation behaviors of cast K317 and K325 alloy at 900°C and 1000°C in air environment are contrastively investigated by TGA, XRD and SEM (EDS). The results show that K317 alloy has a superior oxidation resistance compared with K325 alloy. The kinetic curves of two alloys oxidized at 900°C for 100 h obey the parabolic rate law while those at 1000°C obey sectionally the parabolic rate law. The oxide structure of K317, from the top surface down to the base material, consists of NiO-TiO2-NiCr2O4 composite oxide, Cr2O3 oxide dense band and Al2O3 internal oxide. In comparison, internal oxidation is not observed in K325 alloy whose oxide layer is composed by two oxide layers: NiO-NiCr2O4-Nb2O5 composite oxide and Cr2O3 oxide layer. Serious MoO3 volatilization and oxide spallation take place in K325 alloy after the oxidation at 1000°C for 100h. In addition, the adhesion property of K325 alloy is worse than that of K317 alloy due to the occurrence of the micro-voids on the oxide layer/substrate interface.

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[Gao Shuang, Hou Jieshan, Yang Fei, Wang Changshuai, Zhou Lanzhang. High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys[J]. Rare Metal Materials and Engineering,2019,48(3):960~966.]
DOI:10.12442/j. issn.1002-185X.20170686

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History
  • Received:August 03,2017
  • Revised:October 31,2017
  • Adopted:November 08,2017
  • Online: April 10,2019
  • Published: