کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1575253 1514739 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen effect on dislocation nucleation in a ferritic alloy Fe–15Cr as observed per nanoindentation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Hydrogen effect on dislocation nucleation in a ferritic alloy Fe–15Cr as observed per nanoindentation
چکیده انگلیسی

Hydrogen effects on dislocation nucleation in polycrystalline ferritic Fe–15Cr binary alloy were investigated using in situ electrochemical nanoindentation. Linear elastic finite element calculations taking account of the cubic symmetry of BCC crystals were made to extract the resolved shear stresses on the different slip systems of the indented grains. It is shown that the resolved shear stresses corresponding to the experimentally measured pop-in loads are compatible with homogeneous dislocation nucleation. The resolved shear stress necessary to nucleate dislocations from defect-free crystals was estimated at μ/12–μ/13 without hydrogen. Cathodically charged hydrogen reduces the shear strength of the crystal by 8.5%–19.8%, thus promoting dislocation multiplication.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 604, 16 May 2014, Pages 86–91
نویسندگان
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