Effect of rare earth Ce on high temperature oxidation behavior of 310S austenitic heat-resistant stainless steel

doi:10.13251/j.issn.0254-6051.2022.01.020

Abstract

Abstract: High-temperature oxidation behavior of 310S austenitic heat-resistant stainless steel with different rare earth Ce contents was systematically studied by means of thermogravimetric analysis. The oxidation mass gain of the tested steel at same temperature was analyzed by the oxidation mass gain curve. The cross-section structure and element distribution of oxidation film were characterized by field emission electron probe (EPMA), and the phase composition of oxidation film was analyzed by means of X-ray diffraction (XRD). The results show that in the early stage of cyclic oxidation, the high temperature oxidation mass gain curve of the tested steel conforms the parabolic law. The oxide film of the tested steel is composed of an outer layer of (Cr,Mn)₃O₄ “spinel” oxide and an inner layer of Cr₂O₃ oxide. An appropriate amount of rare earth element Ce can promote the release of stress at the oxide/substrate interface, while reduce and delay the formation of voids at the oxide film and substrate interface, thereby improving the spalling resistance of the oxide film.

Key words: rare earth, 310S austenitic stainless steel, cyclic oxidation

CLC Number:

TG142.71

Jiao Junhong, Li Xin, Liu Zhenyu. Effect of rare earth Ce on high temperature oxidation behavior of 310S austenitic heat-resistant stainless steel[J]. Heat Treatment of Metals, 2022, 47(1): 120-124.

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