Effects of Solution Depletion and Segregation Oxidation on Morphology of Modified 310 Austenitic Stainless Steel |
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| Authors: | Hong-ying SUN Qiang HE Zhang-jian ZHOU Man WANG Guang-ming ZHANG Shao-fu LI |
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| Affiliation: | 1. Key Laboratory of Key Functional Parts of Machine,Anyang Institute of Technology,Anyang 455002, Henan,China;2. School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | The oxidation morphologies of modified 310 steel exposed in 900 and 1 100 ℃ air were investigated.A double layer morphology consisting of a (Cr,Mn)-rich outer layer and a fine Cr-rich inner layer was formed at 900 ℃.It was related to the breakaway oxidation induced by the Cr-depletion and the Mn-segregation in inner layer.Some Cr-rich oxides with amorphous state were formed along grain boundaries.And some new finer oxide grains,voids and Cr-rich precipitates were observed in spallation areas at 1 100 ℃.Correspondingly,the oxidation kinetic curve dropped with the spallation of scale and increased with the formation of some new oxide grains.It was caused by segregation of Cr and the transformation of oxides from Cr2 O 3 to the volatile oxides at elevated temperature.XRD analysis showed that the precipitates were mainly composed of CrO 3 .Segregation and depletion for solutions were also dis-cussed by oxidation diffusion mechanisms. |
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| Keywords: | austenitic stainless steel SEM morphology oxidation segregation element |
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