کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1258969 971652 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Refinement of nano-Y2O3 on microstructure of hypereutectic Fe-Cr-C hardfacing coatings
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Refinement of nano-Y2O3 on microstructure of hypereutectic Fe-Cr-C hardfacing coatings
چکیده انگلیسی

The Fe-Cr-C flux-cored wires with 0 wt.%, 0.63 wt.%, 2.54 wt.% and 5.08 wt.% additions of nano-Y2O3 were developed in this work. And the different hypereutectic Fe-Cr-C hardfacing coatings were prepared. The phase structures of the coatings were determined by X-ray diffraction. The microstructures were observed by optical microscopy. The morphologies of the hypereutectic Fe-Cr-C hardfacing coatings were observed by a field emission scanning electron microscope equipped with an X-ray energy dispersive spectrometer. The effectiveness of Y2O3 as heterogeneous nuclei of primary M7C3 was calculated with the misfit theory. The experiment results showed that, the microstructures of the hypereutectic Fe-Cr-C hardfacing coatings consisted of M7C3, γ-Fe and α-Fe phases. With the increase of nano-Y2O3 additives, primary M7C3 in hypereutectic Fe-Cr-C coatings could be refined gradually. The average size of the primary M7C3 was the minimum, which was 22 μm, when nano-Y2O3 additive was 2.54 wt.%. The calculated results showed that, the two-dimensional lattice misfit between the face (001) of Y2O3 and face (100) of orthorhombic M7C3 was 4.911%, which indicated that Y2O3 as heterogeneous nuclei of M7C3 was middle effective to refine the primary M7C3.

TEM images of the M7C3 carbides (a), (b) The primary M7C3; (c), (d) The eutectic M7C3Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Rare Earths - Volume 33, Issue 6, June 2015, Pages 671–678
نویسندگان
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