کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1659362 | 1517684 | 2010 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Nitriding of ferritic Fe–Cr–Al alloys Nitriding of ferritic Fe–Cr–Al alloys](/preview/png/1659362.png)
Upon nitriding ferritic iron-based Fe–Cr–Al alloys (containing 0.25–1.25 at.% Cr and Al) a very hard surface layer develops containing nano-precipitates of alloying element nitrides. The microstructure of the nitrided zone was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Coherency of the nano-nitrides with the ferrite matrix, as revealed by TEM, especially for the chromium-rich alloys, is compatible with the absence of separate nitride reflections in the X-ray diffractograms; the large coherency misfit strains induce extreme and particularly shaped broadening of the diffraction lines. The h k l dependence of the diffraction-line broadening is indicative of the specific orientation relationship of the nitride nano-precipitates and the ferrite matrix, as determined by TEM. For increasing Cr/Al atomic ratio, the microhardness and the diffraction-line broadening increase, whereas the amount of excess nitrogen decreases.
Journal: Surface and Coatings Technology - Volume 204, Issues 12–13, 15 March 2010, Pages 1942–1946