کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1570668 1514372 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A comparison of EBSD based strain indicators for the study of Fe-3Si steel subjected to cyclic loading
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
A comparison of EBSD based strain indicators for the study of Fe-3Si steel subjected to cyclic loading
چکیده انگلیسی


• Microstructure investigation of the fatigue behaviour of an iron-silicon steel
• Use of cECCI to investigate the fatigue dislocations structures
• Characterisation of local plastic accommodation through EBSD misorientation criteria

The current work aims at proposing an EBSD-based indicator for fatigue damage of a Fe-3Si steel. At the same time direct observation of dislocation structures is provided by electron channelling contrast imaging (ECCI). The investigation consisted in processing the EBSD data from patterns collected on specimen subjected to low cycle fatigue. It revealed two different regimes depending on the applied total strain variation which is explained by the identification of the dislocations structures and their evolution. At low strain variation, strain accommodation occurs by planar glide of dislocations uniformly distributed throughout the grains. No misorientation evolution is observed. At higher strain variation, the vein-channel structure is observed within the grain and the wall-channel structure in the vicinity of grain boundaries. The misorientation between these two dislocation structures is evaluated at about 0.7° which is detected by the EBSD analyses and explains the increase of the different misorientation based criteria. The EBSD study enables also the prediction of crack initiation mode. Finally, this study points out the limits of the EBSD technique as no misorientation evolution is detected at small strain variation. Indeed, the lattice distortion is too weak to be detected by conventional EBSD.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 115, May 2016, Pages 61–70
نویسندگان
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