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Effects of silicon on the oxidation behavior of Hastelloy N superalloy at 850℃
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Affiliation:

1.Shanghai Institute of Applied Physics,Chinese Academy of Sciences;2.School of Mechanotronics Vehicle Engineering,Chongqing Jiaotong University

Clc Number:

TG146.1+5

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    Abstract:

    The isothermal oxidation behavior of Hastelloy N superalloy with different silicon contents in air at 850℃ were investigated by using discontinuous increasing weight method. The results showed that oxidation mass gain kinetics of the samples follow the parabolic law. It was observed that the surfaces of the alloys exhibited a multi-layer structure after 100h oxidation. The outer oxide flim of Hastelloy N superalloy mainly consists of NiO, NiFe2O4and other oxide composites. The middle layer is confirmed to be Cr2O3 and MoO2. Since a continuous and dense SiO2 sublayer is formed at the metal-oxide interface, it is effective to prevent Cr diffusion. The addition of Si promotes the formation of a relatively continuous and compact Cr2O3 and it can strongly improve the oxidation resistance.

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[Guo Weijie, Li Jianshu, Lu Yanling, Zhang Jixiang, Zhou Xingtai. Effects of silicon on the oxidation behavior of Hastelloy N superalloy at 850℃[J]. Rare Metal Materials and Engineering,2019,48(3):885~891.]
DOI:10.12442/j. issn.1002-185X.20170712

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History
  • Received:August 11,2017
  • Revised:October 14,2017
  • Adopted:November 09,2017
  • Online: April 10,2019
  • Published: