Oxidation mechanism of Incoloy 800H alloy in steam at 675 ℃

TANG Liying; ZHAN Yingjie; LI Jiang; XU An; GONG Bing; LI Ji; ZHOU Rongcan; WANG Qingwu

doi:10.19666/j.rlfd.202212146

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Oxidation mechanism of Incoloy 800H alloy in steam at 675 ℃

更新时间：2025-09-28

- Oxidation mechanism of Incoloy 800H alloy in steam at 675 ℃
- Thermal Power Generation Vol. 52, Issue 4, Pages: 99-103(2023)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能山东石岛湾核电有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202212146
  CLC： TM623;TG132.3
- Published：2023
- 稿件说明：
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TANG Liying, ZHAN Yingjie, LI Jiang, et al. Oxidation mechanism of Incoloy 800H alloy in steam at 675 ℃[J]. Thermal power generation, 2023, 52(4): 99-103.
DOI：

TANG Liying, ZHAN Yingjie, LI Jiang, et al. Oxidation mechanism of Incoloy 800H alloy in steam at 675 ℃[J]. Thermal power generation, 2023, 52(4): 99-103. DOI： 10.19666/j.rlfd.202212146.

摘要

Incoloy 800H合金被用于我国首台高温气冷堆核电机组传热管高温段，其最高设计温度达到675℃，对其在设计温度下的蒸汽氧化性能进行研究，采用扫描电镜（SEM）、透射电镜（TEM）和X射线能谱（EDS）等表征了Incoloy 800H合金的氧化层结构。试验结果表明：800H合金在675℃蒸汽中的氧化动力学曲线接近立方规律，氧化增重的立方与时间接近正比关系。氧化层呈双层结构，外层主要为Fe_3O_4和Fe_2O_3及少量Ni，内层为中间分布着少量金属Ni、Al_2O_3和TiO_2颗粒的Cr_2O_3纳米晶，在邻近氧化层的基体金属中，分布着Cr_2O_3、Al_2O_3和TiO_2内氧化颗粒。

Abstract

Incoloy 800H is used for high temperature section of heat transfer tubes of the first high temperature gascooled reactor nuclear power unit in China

of which the highest design temperature is 675℃.The steam oxidation properties of the Incoloy 800H at the design temperature are investigated.The structure of oxide scale of the Incoloy 800H is characterized by scanning electron microscopy (SEM)

transmission electron microscopy (TEM) and X-ray energy dispersive spectroscopy (EDS).The results show that

the oxidation kinetic curve of the 800H alloy in steam at 675℃is close to the cubic law

namely the cubic of the weight gain is nearly proportional to the oxidation time.The oxide scale has a double-layer structure.The outer layer is mainly composed of Fe_3O_4

Fe_2O_3 and a small amount of Ni

and the inner layer is Cr_2O_3 nanocrystalline with a small amount of Ni

Al_2O_3 and TiO_2 particles distributed in it.Some internal oxide particles of Cr_2O_3

Al_2O_3 and TiO_2 are distributed in the matrix metal adjacent to the oxide layer.

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Related Institution

School of Materials Science, Northwestern Polytechnical University

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