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金属学报  2016, Vol. 52 Issue (2): 217-223    DOI: 10.11900/0412.1961.2015.00226
  论文 本期目录 | 过刊浏览 |
利用高分辨同步辐射Micro-CT定量三维表征含Ti铁素体不锈钢铸坯中氧化物夹杂*
杨文1,张立峰1(),任英1,段豪剑1,张莹1,肖向辉2
1 北京科技大学冶金与生态工程学院, 北京 100083
2 Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH RESOLUTION SYNCHROTRON MICRO-CT
Wen YANG1,Lifeng ZHANG1(),Ying REN1,Haojian DUAN1,Ying ZHANG1,Xianghui XIAO2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
引用本文:

杨文,张立峰,任英,段豪剑,张莹,肖向辉. 利用高分辨同步辐射Micro-CT定量三维表征含Ti铁素体不锈钢铸坯中氧化物夹杂*[J]. 金属学报, 2016, 52(2): 217-223.
Wen YANG, Lifeng ZHANG, Ying REN, Haojian DUAN, Ying ZHANG, Xianghui XIAO. QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH RESOLUTION SYNCHROTRON MICRO-CT[J]. Acta Metall Sin, 2016, 52(2): 217-223.

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摘要: 

采用高分辨同步辐射计算机微断层扫描技术(Micro-CT)对含Ti铁素体不锈钢铸坯中氧化物夹杂进行了三维检测, 定量分析了氧化物夹杂数量、体积和尺寸等特征在铸坯厚度方向的分布规律, 并与自动扫描电镜ASPEX的二维检测结果对比. 结果表明, Micro-CT能够更准确地实现钢中夹杂物的无损检测. Micro-CT检测到的氧化物基本都为球形, 各位置夹杂物数量随着尺寸的增加而减少. 氧化物数量密度和体积分数整体上在铸坯厚度中心最大, 并随着距厚度中心的距离增加而减小, 在铸坯表层附近达到最小值. 而氧化物平均等效直径在铸坯表层附近最大, 在内弧1/4厚度附近最小.

关键词 同步辐射Micro-CT定量三维表征Ti处理铁素体不锈钢氧化物夹杂连铸板坯    
Abstract

Non-metallic inclusions especially oxides are detrimental to the quality of ferritic stainless steel products. Accurate characterization on inclusions is conducive to further research on the inclusion control. There are some disadvantages in traditional 2D or 3D inclusion detection methods, tomography is thus employed to characterize inclusions in steel in the current work. Oxide inclusions in the slab of Ti bearing ferritic stainless steel were characterized 3 dimensionally using high resolution synchrotron micro computed tomography (Micro-CT), and the variations of quantity, volume and size of oxide inclusions along the thickness of continuous casting slab were analyzed quantitatively and compared with the 2D results detected by ASPEX, an automated scanning SEM. It was found that non-destructive detection could be well done by Micro-CT more accurately. The detected oxides by Micro-CT were mainly global, and the number of inclusions decreased with increasing size. In general, the number density and volume fraction of oxides were largest in the center of slab thickness, and decreased with the distance from center, reached the smallest value near the surface of slab. Contrarily, the average of equivalent diameter of oxide inclusions was largest near slab surface, and was smallest near quarter of thickness on the loose side.

Key wordssynchrotron radiation    Micro-CT    quantitative 3D characterization    Ti bearing ferritic stainless steel    oxide inclusion    continuous casting slab
收稿日期: 2015-04-17     
基金资助:* 国家自然科学基金项目51274034, 51334002和51404019资助
图1  Micro-CT设备及原理示意图
图2  铸坯取样位置示意图
图3  含Ti不锈钢铸坯中典型氧化物夹杂形貌及成分
图4  无水有机溶液电解提取的夹杂物形貌
图5  Micro-CT检测到的铸坯不同厚度位置的氧化物形貌及分布
图6  铸坯不同厚度处氧化物夹杂等效直径分布
图7  氧化物体积数量密度沿铸坯厚度变化
图8  氧化物体积分数沿铸坯厚度变化
图9  氧化物平均等效直径沿铸坯厚度变化
图10  ASPEX检测得到的≥5 μm的氧化物面积数量密度和面积分数沿铸坯厚度变化
图11  ASPEX检测得到的≥5 μm的氧化物平均尺寸沿铸坯厚度变化
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