Effect of Oxidation Process on Surface Scale of 20Cr2Ni3 Piercing Plug Steel

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Zheng, Chengming^1 ; Tian, Qingchao^1

State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai, China^1

关键词: Mixed solution;    Oxidation morphology;    Oxidation process;    Oxidation treatments;    Scale thickness;    Steel microstructure;    Surface scale;    Thermodynamic conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022068/pdf
DOI  :  10.1088/1757-899X/490/2/022068

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A two-stage oxidation process compared with two conventional ones is conducted under drop-feeding atmosphere of H2O-C2H5OH mixed solution for the surface treatment of the 20Cr2Ni3 steel piercing plug. The oxidation morphology and microstructure of the steel after oxidation treatment were studied by using optical microscopy and scanning electron microscopy. The results show that the investigated three oxidation processes are all appropriate from viewpoint of the steel microstructure. It is found that the two-stage oxidation process not only shows the best surface quality but also holds a moderate overall scale thickness with highest percentage of inner scale, and thus manifests the best performance. It is verified that Ni does not possess the thermodynamic conditions of oxidation under the specific atmosphere, and the mass transfer of Ni occurs in the form of elementary substance.