کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1582236 1514874 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanisms of creep deformation in polycrystalline Ni-base disk superalloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Mechanisms of creep deformation in polycrystalline Ni-base disk superalloys
چکیده انگلیسی

This paper reviews the presently proposed mechanisms for creep of γ′ strengthened Ni-base superalloys that are typically used for disk applications. Distinct creep strength controlling modes, such as dislocation-coupled antiphase-boundary shearing, shearing configurations involving superlattice stacking faults, Orowan looping, climb by-pass, and microtwinning have been observed. These are strongly influenced by the scale of the γ′ precipitating phase and are operative within specific ranges of temperature and stress. Insight from more recent experimental findings concerning microtwinning and extending stacking fault mechanisms suggest important similarities between these deformation modes. It is suggested that local atomic reordering in the wake of Shockley partials is responsible for the temperature dependence exhibited in this regime.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volumes 483–484, 15 June 2008, Pages 25–32
نویسندگان
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