Characterization of Dual-Phase Steel Microstructure by Combined Submicrometer EBSD and EPMA Carbon Measurements

Characterization of Dual-Phase Steel Microstructure by Combined Submicrometer EBSD and EPMA Carbon Measurements
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通过组合亚微米 EBSD 和 EPMA 碳测量表征双相钢微观结构

DOI:
10.1017/s1431927613001554
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发表时间:
2013
影响因子:
2.8
通讯作者:
S. Richter
S. Richter
中科院分区:
工程技术4区
文献类型:
--
作者:
A. Schwedt;A. Ramazani;U.Prahl;S. Richter

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结合电子背散射衍射(EBSD)和电子探针显微分析(EPMA)测量来表征工业生产的双相钢含有一些贝氏体分数。高分辨率的碳映射上获得的场发射电子探针被用来验证和提高识别的成分(铁素体,马氏体,贝氏体)EBSD使用的图像质量和内核平均取向差。该组合消除了识别贝氏体和相变诱导位错区之间的模糊性,如果只考虑内核平均取向差。高取向差区域中碳的检测证实了贝氏体的存在。这些结果得到了金属腐蚀后的二次电子象的证实。由于EBSD和EPMA的空间分辨率之间的差异,这种组合方法的局限性进行了评估。此外,提出了一种适用于碳分析的定量方法,并用于在亚微米尺度上测量马氏体和贝氏体中的碳浓度。从参考材料的测量,该方法给出了0.02重量% C的准确度和优于0.05重量% C的精度,尽管不可避免的碳氢化合物污染的影响。
Electron backscatter diffraction (EBSD) and electron probe microanalysis (EPMA) measurements are combined to characterize an industrial produced dual-phase steel containing some bainite fraction. High-resolution carbon mappings acquired on a field emission electron microprobe are utilized to validate and improve the identification of the constituents (ferrite, martensite, and bainite) performed by EBSD using the image quality and kernel average misorientation. The combination eliminates the ambiguity between the identification of bainite and transformation-induced dislocation zones, encountered if only the kernel average misorientation is considered. The detection of carbon in high misorientation regions confirms the presence of bainite. These results are corroborated by secondary electron images after nital etching. Limitations of this combined method due to differences between the spatial resolution of EBSD and EPMA are assessed. Moreover, a quantification procedure adapted to carbon analysis is presented and used to measure the carbon concentration in martensite and bainite on a submicrometer scale. From measurements on reference materials, this method gives an accuracy of 0.02 wt% C and a precision better than 0.05 wt% C despite unavoidable effects of hydrocarbon contamination.
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