Author/Authors :
Ran, Xu Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Zhang, Mengqi Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Han, Ying Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Zu, Guoqing Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Zhu, Weiwei Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Chen, Hua Key Laboratory of Advanced Structural Materials - Ministry of Education - Changchun University of Technology - Changchun , China , Sun, Jiapeng College of Mechanics and Materials - Hohai University - Nanjing , China
Abstract :
The isothermal oxidation behavior of 17Cr-0.85Si-0.5Nb-1.2Cu ferritic stainless steel in air was studied from 850°C to 1050°Cbyanalyzing its weight gain after oxidation. The kinetic curves were plotted using the oxidation weight-gain data, and thestructure, surface morphology, and element distribution of the oxidefilms were analyzed by XRD, SEM, and EDS. The resultsshowed that the oxidation kinetics curves at 850°C and 950°C followed a parabolic law, and a continuous and dense oxidefilmcomposed of Cr2O3and MnCr2O4, FeCr2O4, and Cu-Cr rich spinel was formed, which reveals that the steel displayed goodoxidation resistance. When the temperature was increased to 1050°C, the oxidation kinetics curves gradually changed fromparabolic to linear after 40 h exposure, which indicated that the oxidation resistance significantly worsened. A lower oxidationresistance was observed at 1050°C due to the formation of a large amount of Fe2O3on the surface and the volatilization of theinner Cr2O3layer.
Keywords :
High-Temperature Oxidation Behavior , Cu-Bearing 17 Cr Ferritic Stainless Steel , XRD , Cu-Cr , Cr2O3 and MnCr2O4 , FeCr2O4
