低铬钢水蒸气气氛下的氧化行为

doi:10.13228/j.boyuan.issn0449-749x.20200378

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Abstract In order to investigate the oxidation behavior of low Cr element content steel under water vapor conditions, a thermogravimetric analyzer (TGA) was used to carry out high-temperature oxidation experiments for 5Cr and 10Cr steel in a water vapor atmosphere. The mechanism of surface oxidation of low Cr content steel under water vapor atmosphere was studied by the metallographic microscope and XRD. The results show that the existence of water vapor on the surface of the matrix will produce holes and cracks, which becomes a favorable channel for the internal diffusion of water vapor. With the increase of chromium content, the higher the required temperature of the transformation from linear law to parabola law. The iron oxide layer of the sample is composed of the outer oxide layer and the inner oxide layer. The outer oxide layer is mainly Fe₂O₃ and Fe₃O₄, the inner oxide layer contains a large amount of Cr oxides. When the oxidation temperature is above 1 000 ℃, the weight gain of the two sheets of steel is close, mainly because the Cr elements in the steel are oxidized to form Cr₂(OH)₂ and Cr (OH)₃, which results in the failure of the oxidation resistance of the inner layer.

Key words： high temperature oxidation water vapor oxide layer Fe-Cr steel oxide scale

Received: 23 July 2020

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	Articles by authors
	DU Chong-yang
	SUN Bin
	CHENG Lei
	GAO Wei
	ZHANG Jing-ke

Cite this article:

DU Chong-yang,SUN Bin,CHENG Lei等. Oxidation behavior of steel with low Cr content under water vapor atmosphere[J]. Iron and Steel, 2021, 56(2): 139-146.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200378 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I2/139

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