کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9703859 1463865 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The structural-phase state changes under the pulse current influence on the fatigue loaded steel
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
The structural-phase state changes under the pulse current influence on the fatigue loaded steel
چکیده انگلیسی
Structure and phase transformations in Fe-0.6C-1Mn-2Si steel subjected to multicyclic fatigue tests under normal conditions and with intermediate electrostimulation are investigated by the methods of metallography of etched microsections and scanning and transmission electron diffraction microscopy of thin foils and carbon replica. It is demonstrated that fatigue failure under normal loading is preceded by complete dissolution of initial cementite particles with carbon localized on structural defects (dislocations, subboundaries, and boundaries), micropores, and microcracks. Electrostimulation, promoting the relaxation of stress concentrators through dissolution of particles localized on the grain boundaries and the state change of the interphase boundaries between the matrix and second-phase particle, causes the mean and maximum subcritical crack length to increase together with the thickness of the sample layer involved in the strain of the material and the zone of fatigue crack growth. This is accompanied by a significant increase in the operating lifetime of the material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 27, Issues 10–12, October–December 2005, Pages 1221-1226
نویسندگان
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