Effect of second-phase particles on the oxidation behaviour of a high-manganese austenitic heat-resistant steel. (15th April 2021)

• Record Type: Journal Article
• Authors: Liu, T.L.; Zheng, K.H.; Lin, Y.F.; Luo, Z.C.
• Is Part Of: Corrosion science. Volume 182(2021)
• Publication Date: 2021-04-15
• Subjects: Austenitic heat-resistant steel -- Oxidation -- High manganese -- Steel matrix composite -- Second-phase particle; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109284
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The SMC exhibits superior oxidation and spallation resistance. The scale formed on SMC is compact and consist of complex inter-overlapped oxides. The accelerated outward diffusion of Mn enhanced the oxidation resistance of SMC. The preferentially oxidised particles key the scale to improve the spallation resistance. Abstract: In this work, the presence of second-phase particles was found can significantly improve the oxidation and spallation resistances of a high-manganese austenitic heat-resistant steel. We show this unexpected improvement is originated from three correlated phenomena caused by the second-phase particles. First, the stratified growth of scale is avoided due to the chemical inhomogeneity of the novel steel. Further, the selective oxidation of second-phase particles provides a pinning effect for the scale. Last but not least, the accelerated outward diffusion of Mn reduces the critical Cr concentration for the formation of a stable protective Cr2 O3 layer.