氧化对Cr25Ni35Nb与Cr35Ni45Nb合金组织和磁性的影响

doi:10.11896/cldb.201904016

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Abstract In this work, the oxidation behavior and the magnetic properties of Cr25Ni35Nb and Cr35Ni45Nb alloys after a long-term service were investigated by employing OM, SEM, XRD and VSM analysis. The results show that the oxidation layer formed consists of Cr₂O₃, SiO₂ and Fe₂O₃, and exhibits cracks and rupture. The high-temperature instability of Cr₂O₃ and the cyclic coking/decoking operation during long-term service are found to contribute to the rupture of the outer and inner surface oxidation layers, respectively. There could be observed three zones, i.e. oxidation layer, carbide-depleted zone and carbides zone, at both inner and outer walls of the pyrolysis furnace tubes. The oxidation film is a conti-nuous Cr₂O₃ oxide layer, and SiO₂ disperses along the grain boundaries at the carbide-depleted zone. The original two kinds of austenitic heat-resistant alloys are paramagnetic. And due to the lower Cr content of matrix at the carbide-depleted zones, the paramagnetic structures are transformed into ferromagnetic structures, with saturation magnetizations larger than 20 emu/g. Therefore, it could be concluded that oxidation is also one of the critical factors that impel ethylene pyrolysis furnace tube to the transformation into ferromagnetic structure.

Key words： oxidization carbide-depleted zone saturation magnetization pyrolysis furnace tube ferromagnetic structure

Published: 11 March 2019

CLC number:

TG142.73

Fund:This work was financially supported by the National High-tech Research and Development Project of China (2015AA034402), the National Natural Science Foundation of China (U1610256).

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	Articles by authors
	GUO Jingfeng
	CAO Tieshan
	CHENG Congqian
	WANG Fugang
	MENG Xianming
	ZHAO Jie

Cite this article:

GUO Jingfeng,CAO Tieshan,CHENG Congqian, et al. Effect of Oxidation on Microstructure and Magnetic Properties of Cr25Ni35Nb and Cr35Ni45Nb Alloys[J]. Materials Reports, 2019, 33(4): 650-653.

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http://www.mater-rep.com/EN/10.11896/cldb.201904016 OR http://www.mater-rep.com/EN/Y2019/V33/I4/650

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