Investigation of element segregation and banded structure in 907A steel based on microbeam X-ray fluorescence spectrometry
CHU Mengjie1, SUN Yuhan2, LI Dongling1,3,4, LIN Shuangping1,3,4 SHEN Xuejing*1,3,4, WANG Haizhou1,3
1. Central Iron and Steel Research Institute Co., Ltd.,Beijing 100081,China; 2. University of Science and Technology Beijing,Beijing 100083,China; 3. Beijing Key Laboratory of Metallic Materials Characterization, Beijing 100081,China; 4. NCS Testing Technology Co.,Ltd.,Beijing 100081,China
Abstract：907A steel is a self-developed low carbon structural steel for marine products,and it has been widely used in the construction of conventional ships.The banded structure defects are usually formed during the hot rolling of casting billet,which will result in the uneven composition and structure of casting billet,thus severely affecting the subsequent processability and use performance of steels.Therefore,the distribution of banded structure must be characterized in order to ensure the quality of 907A steel.At present,the banded structure in 907A steel is mainly analyzed by metallographic rating.The sample surface should be treated by corrosion and the sample preparation is difficult.Moreover,the segregation of elements cannot be reflected. In experiments,the original position statistic distribution analysis method of banded structure and element segregation in 907A steel based on microbeam X-ray fluorescence spectrometry (μ-XRF) was studied.According to the components and elemental content range in 907A steel,the measuring parameters of μ-XRF were optimized.The spectral standard sample of low carbon steel alloy with similar composition to the testing samples was employed for the correction of quantitative model of instrument.Two-dimensional content distribution of four main alloying elements including Ni,Mn,Cr and Cu in 907A steel was obtained.It was found that when the scanning step was 10 μm,the two-dimensional content distribution of Ni,Mn and Cr was in good agreement with the banded structure distribution map obtained by the metallographic method,indicating that the banded structure distribution in steel could be analyzed by the μ-XRF method.The statistical analysis showed that the distribution of Cr was relatively uniform with statistical segregation degree of about 5%.The segregation of other three elements was obvious,and the statistical segregation degrees were close to or even higher than 10%.Meanwhile,the distribution of various elements on the banded structure was also investigated.It was found that Mn,Cr and Ni on the dark banded structure showed obvious positive segregation.The segregation degrees of elements on the banded structure were all higher than 1.The positive segregation which caused by the enrichment of Ni was most obvious.
褚梦婕, 孙宇晗, 李冬玲, 林双平, 沈学静, 王海舟. 基于微束X射线荧光光谱的907A钢元素偏析与带状组织探究[J]. 冶金分析, 2024, 44(1): 1-9.
CHU Mengjie, SUN Yuhan, LI Dongling, LIN Shuangping SHEN Xuejing, WANG Haizhou. Investigation of element segregation and banded structure in 907A steel based on microbeam X-ray fluorescence spectrometry. , 2024, 44(1): 1-9.
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