Quantitative statistical distribution analysis of B10 copper-nickel alloy composition based on microbeam X-ray fluorescence spectrometry
CHU Mengjie1, SUN Yuhan2, LI Dongling3,4, DONG Caichang5 SHEN Xuejing*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; 5. Qingdao NCS Testing & Corrosion Protection Technology Co., Ltd., Qingdao 266000, China
Abstract：B10 copper-nickel alloy has good corrosion resistance to flowing seawater, and it is mainly used in ship seawater pipeline systems. The main alloying elements in B10 copper-nickel alloy are Cu and Ni as well as a small amount of Fe and Mn. The content and distribution of these elements have an important impact on the corrosion resistance of the alloy. In order to improve the performance of copper-nickel alloys, it is necessary to quantitatively characterize the distribution of the alloying elements in the alloy. At present, the elemental analysis of copper-nickel alloys mainly uses chemical methods to obtain the average content of alloying elements, and there have been no research reports on the quantitative characterization of component distribution in a large size range. The original position statistic distribution analysis method of copper-nickel alloy by microbeam X-ray fluorescence spectrometry was developed based on the previous research work. The cross-scale high-throughput in-situ distribution characterization of φ310 mm large-size copper-nickel alloy ingots was realized for the first time. The evolution law of element distribution in the whole process of copper-nickel alloy was studied to provide reference and data support for the improvement of copper-nickel alloy production process. It was found that Fe, Mn and Ni in large-size alloy ingots showed a certain degree of annular segregation at the core of the ingots and at r/4 (r was the radius of ingot). The composition distribution at the edge of ingots was relatively uniform, and the statistical segregation degree of three elements decreased obviously from the center to the edge. The content of Mn was lowest at the center and highest at the edge. The contents of Fe and Ni were highest at the center of ingot and lowest at the edge. The two-dimensional distribution map showed that there was obvious banded segregation distribution for Ni and Fe in the tube blank, while the distribution of three elements was relatively uniform in the pipe. It proved that the uniformity of component distribution in φ30 mm pipe elements was greatly improved after a series of extrusion rolling annealing processes. The statistical segregation degree of pipe elements in micro-regions was less than 1.5%.
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