Oxidation Behaviour of Incoloy800H Alloy in High-Temperature Pure Steam

YANG Zhen; LU Jintao; LE Ming; ZHOU Yongli; LI Hao; YUAN Yong

doi:10.11973/jxgccl201801001

Materials and Mechanical Engineering > 2018 > 42(1): 1-6. > DOI: 10.11973/jxgccl201801001

YANG Zhen, LU Jintao, LE Ming, ZHOU Yongli, LI Hao, YUAN Yong. Oxidation Behaviour of Incoloy800H Alloy in High-Temperature Pure Steam[J]. Materials and Mechanical Engineering, 2018, 42(1): 1-6. DOI: 10.11973/jxgccl201801001

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Oxidation Behaviour of Incoloy800H Alloy in High-Temperature Pure Steam

National Engineering Research Center of Clean Coal Combustion for Utility Boilers, Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, China

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Received Date: December 12, 2016
Revised Date: August 23, 2017

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Abstract

The oxidation behaviour of Incoloy800H alloy in 750℃ and 850℃ pure steam was investigated by discontinuous weighing method, X-ray diffraction, and scanning electron microscopy. The results show that the oxidation kinetics of the tested alloy followed a parabolic law; the oxidation accelerated rapidly with rising temperature. After oxidation in 750℃ steam, an oxide layer mainly composed of (Cr, Mn)₂O₃ was formed on the surface of the tested alloy, discontinuous bulgy Fe₃O₄ was distributed on the oxide layer and Cr in the matrix under the oxide layer was oxidized internally to Cr₂O₃. After oxidation in 850℃ steam, a duplex oxide layer, composed of a thin outer layer of (Fe, Mn)₃O₄ and a thick inner layer of (Cr, Mn)₂O₃, was formed on the surface of the tested alloy; beneath the oxide layer, Al was oxidized inernally to Al₂O₃ along grain boundaries in the matrix.
- Incoloy800H alloy,
- high-temperature steam,
- oxidation behaviour,
- oxide layer

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