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| Effect of Grain Size on Oxidation of Heat-resistant Steels in High Temperature Water Steam |
| YUAN Juntao1, WU Ximao2, WANG Wen1, ZHU Shenglong1, WANG Fuhui1 |
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016,China;
2. Northeast Electric Power Research Institute Co. Ltd., Shenyang 110006, China |
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Abstract Effect of grain size on oxidation of 18Cr-8Ni heat-resistant steels in high temperature water steam was studied at 700 ℃. Oxidation kinetics was obtained by weighting specimens at intervals. After oxidation, all the samples were investigated using field emission scanning electron microscopy (FE-SEM) in terms of plain and cross section views, the chemical composition was analyzed by X-ray energy dispersive analysis (EDS), and the oxide phases were identified by X-ray diffraction (XRD). The results show that grain refinement improves the oxidation resistance of steels to high temperature water steam by lowering the mass gains and postponing the onset of breakaway oxidation; grain refinement alters the microstructure of oxide scale by reducing the size of “crater” oxide region and promoting the formation of Cr-rich layer at scale/alloy interface; the beneficial effects of grain size on oxidation of steels are ascribed to the promotion of oxide nucleation and Cr transport towards scale/alloy interface.
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