کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1581239 1514855 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fe–C nanograined alloys obtained by high-pressure torsion: Structure and magnetic properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Fe–C nanograined alloys obtained by high-pressure torsion: Structure and magnetic properties
چکیده انگلیسی

The microstructure, phase composition, Mössbauer spectra and magnetic properties of nine binary Fe–C alloys with carbon concentrations between 0.05 and 1.7 wt.% were studied in the as-cast state, after a long annealing at 725 °C and after high-pressure torsion (HPT) at ambient temperature and 5 GPa with five anvil rotations (shear strain about 6). The grain size after HPT was in the nanometer range. Only Fe3C (cementite) and α-Fe remain in the alloys after HPT. It was also shown that the less stable Hägg carbide (Fe5C2) and retained austenite disappear, and phase composition closely approaches the equilibrium corresponding to the HPT temperature and pressure. Measurements of saturation magnetization and Mössbauer effect reveal that the amount of cementite decreases after HPT. The reason for partial cementite dissolution is the formation of the carbon-rich segregation layers in the ferrite grain boundaries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 503, Issues 1–2, 15 March 2009, Pages 185–189
نویسندگان
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