The production of low-temperature reheated grain-oriented silicon steel is mainly based on the acquired inhibitor method.Due to the additional nitriding process,a high nitrogen content exists in the oxide layer,which ...The production of low-temperature reheated grain-oriented silicon steel is mainly based on the acquired inhibitor method.Due to the additional nitriding process,a high nitrogen content exists in the oxide layer,which changes the structure of the oxide layer.In this study,the structure of the surface oxide layer after nitriding was analyzed by scanning electron microscopy(SEM),electron back-scattered diffraction(EBSD),glow discharge spectrometry(GDS),and X-ray diffraction(XRD).The size and orientation of ferritic grains in the oxide layer were characterized,and the distribution characteristics of the key elements along the thickness direction were determined.The results show that the oxide layer of the steel sample mainly comprised particles of Fe2SiO4 and spherical and lamellar SiO2,and Fe4N and fcc-Fe phases were also detected.Moreover,the size and orientation of ferritic grains in the oxide layer were different from those of coarse matrix ferritic grains beneath the oxide layer;however,some ferritic grains exhibited same orientations as those in the neighboring matrix.Higher nitrogen content was detected in the oxide layer than that in the matrix beneath the oxide layer.The form of nitrogen enrichment in the oxide layer was analyzed,and the growth mechanism of ferritic grains during the oxide layer formation is proposed.展开更多
Using a biogenic silica(Bio-Si)alkali extraction method,Bio-Si contents of 100 sedimentary covers from Cx21 borehole in the coastal water of Zhoushan, Zhejiang Province,China are analyzed.Combining with the data mater...Using a biogenic silica(Bio-Si)alkali extraction method,Bio-Si contents of 100 sedimentary covers from Cx21 borehole in the coastal water of Zhoushan, Zhejiang Province,China are analyzed.Combining with the data materials such as(210)~Pb sedimentation rate,sediment particle size,annual average sea surface temperature near the borehole from 1890 to the present,runoff discharge of Hankou station in展开更多
基金financially supported by the Fundamental Research Funds for the Central Universities (No. FRF-IC-18-006)
文摘The production of low-temperature reheated grain-oriented silicon steel is mainly based on the acquired inhibitor method.Due to the additional nitriding process,a high nitrogen content exists in the oxide layer,which changes the structure of the oxide layer.In this study,the structure of the surface oxide layer after nitriding was analyzed by scanning electron microscopy(SEM),electron back-scattered diffraction(EBSD),glow discharge spectrometry(GDS),and X-ray diffraction(XRD).The size and orientation of ferritic grains in the oxide layer were characterized,and the distribution characteristics of the key elements along the thickness direction were determined.The results show that the oxide layer of the steel sample mainly comprised particles of Fe2SiO4 and spherical and lamellar SiO2,and Fe4N and fcc-Fe phases were also detected.Moreover,the size and orientation of ferritic grains in the oxide layer were different from those of coarse matrix ferritic grains beneath the oxide layer;however,some ferritic grains exhibited same orientations as those in the neighboring matrix.Higher nitrogen content was detected in the oxide layer than that in the matrix beneath the oxide layer.The form of nitrogen enrichment in the oxide layer was analyzed,and the growth mechanism of ferritic grains during the oxide layer formation is proposed.
文摘Using a biogenic silica(Bio-Si)alkali extraction method,Bio-Si contents of 100 sedimentary covers from Cx21 borehole in the coastal water of Zhoushan, Zhejiang Province,China are analyzed.Combining with the data materials such as(210)~Pb sedimentation rate,sediment particle size,annual average sea surface temperature near the borehole from 1890 to the present,runoff discharge of Hankou station in
