Effect of silicon on microstructure and properties of ferritic heat-resistant steel
ZHANG Ying-bo1,2, ZOU De-ning1, WANG Quan-sheng2, ZHANG Xiao-ming2, LI Yu-nong1
1. School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, Shaanxi, China; 2. Shaanxi Special Equipment Inspection and Testing Institute, Xi′an 710048, Shaanxi, China
Abstract:The 18Cr-Al-Si ferritic heat-resistant stainless steel as a new type of structural connection material is mainly used in the field of supercritical or ultra-supercritical thermal power generation. In order to clarify the influence of Si content on the structure and properties of this steel,based on 18Cr-Al-Si ferritic heat-resistant stainless steel,the Si content of two groups of different components is added.Through the test methods such as room temperature tensile test and high temperature oxidation test,meanwhile,with the help of metallurgical microscope(OM),scanning electron microscope (SEM) and X-ray diffractometer (XRD) and other characterization methods,the structure and properties of different Si content test steels were systematically analyzed. The results show that the increase of Si content will refine the grain size of ferrite and increase the amount of M23C6,the tensile strength and yield strength of the test steel will increase,and the elongation will decrease. The fracture mode will change from ductile to tough-brittle mixed mode. 1.35Si steel has greater mass gain,this is because more M23C6 carbides are precipitated in the steel,thereby reducing the content of Cr dissolved in the matrix and forming the oxide film,and decreasing its high-temperature oxidation resistance.
张英波, 邹德宁, 王泉生, 张晓明, 李雨浓. 硅对铁素体耐热不锈钢组织与性能的影响[J]. 钢铁, 2021, 56(3): 71-76.
ZHANG Ying-bo, ZOU De-ning, WANG Quan-sheng, ZHANG Xiao-ming, LI Yu-nong. Effect of silicon on microstructure and properties of ferritic heat-resistant steel[J]. Iron and Steel, 2021, 56(3): 71-76.
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