Study on quantitative statistical distribution characterization method for niobium-rich phase in GH4169 alloy and its application
SONG Yan1, WANG Peng*2,3, YANG Zhigang3, ZHOU Qingqing3, LI Dongling2,3, BAO Lei3
1. Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China; 2. Beijing Key Laboratory of Metallic Materials Characterization,Beijing 100081,China; 3. NCS Testing Technology Co.,Ltd.,Beijing 100081,China
Abstract：A large amount of niobium is added into GH4169 alloy to improve the high temperature strength. Niobium segregation is inevitably generated during the preparation process, leading to the formation of many niobium-rich phases.The morphology,quantity,size and distribution of these niobium-rich phases will have a direct impact on the mechanical properties of the material,so it is necessary to conduct the quantitative original position statistical distribution characterization of niobium-rich phases.In this paper,a quantitative statistical distribution characterization method for the full range of micron niobium-rich phases in GH4169 alloy was established based on scanning electron microscope(SEM) multi-field automatic acquisition and energy spectrum efficient analysis technology.By setting the brightness and contrast of scanning electron microscope and optimizing the acquisition time of energy spectrum counting,the good segmentation of niobium-rich particles and matrix images as well as reliable detection of micron-grade niobium-rich phases were achieved. The information of the full range of micron niobium-rich phases in the test area,including the position,morphology,size and quantity,was obtained.Moreover,the two-dimensional distribution diagrams and size frequency distribution diagrams of the niobium-rich phase were drawn.The proposed method was applied to the quantitative and statistical distribution characterization of niobium-rich phases in different areas of cross sections of GH4169 alloy bars.The evolution law of quantity and size distribution of niobium-rich phases from center to edge of bars was discussed.The quantity of niobium-rich phases showed the trend of less at center and edge but more at r/2 (r was the radius) position.The average size of niobium-rich phases at center was maximum.The average size was similar at r/2 position and edge,but it decreased at the center.This study provided reference for the subsequent improvement process to reduce the size of niobium-rich phases.
宋妍, 王蓬, 杨植岗, 周晴晴, 李冬玲, 鲍磊. GH4169合金中富铌相的定量统计分布表征方法研究及应用[J]. 冶金分析, 2024, 44(4): 1-8.
SONG Yan, WANG Peng, YANG Zhigang, ZHOU Qingqing, LI Dongling, BAO Lei. Study on quantitative statistical distribution characterization method for niobium-rich phase in GH4169 alloy and its application. , 2024, 44(4): 1-8.
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