Effect of heating temperature on oxide scale of 10CrNiCuSi steel

doi:10.13251/j.issn.0254-6051.2022.01.011

Abstract

Abstract: In order to improve the surface roughness of 10CrNiCuSi shipbuilding steel, the oxidation experiment at 1100-1300 ℃ under air condition was carried out in a resistance furnace. The exfoliation of the oxide scales was evaluated by bend tests. And the evolution of oxide scales at different temperature was studied. The results show that the oxidation rate and thickness of oxide layer increase with the increase of heating temperature. The scale of the tested steel is mainly composed of Fe₂O₃, Fe₃O₄, FeO and internal oxide layer, and the internal oxide layer consists of FeNiCu, Fe₂SiO₄ and FeO phases. The liquid eutectic Fe₂SiO₄/FeO products have a significant influence on the exfoliation of the oxide scales. At the conditions of 1100 ℃ and 1150 ℃, the Fe₂SiO₄ phases presented with granular or massive shape are dispersed in the internal FeO phases. The interface between the scale and the matrix is relatively straight and the scale is easily exfoliated. At the conditions of 1200, 1250 and 1300 ℃, the eutectic product of Fe₂SiO₄-FeO presents an anchor-like morphology, which is pinned to the interface of oxide scale and substrate resulting in rough bonding interface, and the anchor-like FeNiCu phases have a good bonding properties with substrate and the scale. The synergistic effects cause the oxide scale hard to exfoliate. Therefore, it is more appropriate to remove the oxide scales at 1100-1150 ℃.

Key words: 10CrNiCuSi steel, heating temperature, oxide scale, Fe₂SiO₄-FeO, exfoliation

CLC Number:

TG156.1

Zhao Lei, Li Jianming, Mu Xiaobiao, Chai Xiyang, Chai Feng, Pan Tao. Effect of heating temperature on oxide scale of 10CrNiCuSi steel[J]. Heat Treatment of Metals, 2022, 47(1): 63-68.

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