کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7880901 1509593 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deformation mechanisms in a precipitation-strengthened ferritic superalloy revealed by in situ neutron diffraction studies at elevated temperatures
ترجمه فارسی عنوان
مکانیزم های تغییر شکل در ابررسانای فرتیتی تقویت شده با بارندگی در مطالعات پراکندگی نوترون در دمای بالا
کلمات کلیدی
پراش نوترون، ابررسانای فریتی، رفتار تغییر شکل در دمای بالا،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
The ferritic superalloy Fe-10Ni-6.5Al-10Cr-3.4Mo strengthened by ordered (Ni,Fe)Al B2-type precipitates is a candidate material for ultra-supercritical steam turbine applications above 923 K. Despite earlier success in improving its room-temperature ductility, the creep resistance of this material at high temperatures needs to be further improved, which requires a fundamental understanding of the high-temperature deformation mechanisms at the scales of individual phases and grains. In situ neutron diffraction has been utilized to investigate the lattice strain evolution and the microscopic load-sharing mechanisms during tensile deformation of this ferritic superalloy at elevated temperatures. Finite-element simulations based on the crystal plasticity theory are employed and compared with the experimental results, both qualitatively and quantitatively. Based on these interphase and intergranular load-partitioning studies, it is found that the deformation mechanisms change from dislocation slip to those related to dislocation climb, diffusional flow and possibly grain boundary sliding, below and above 873 K, respectively. Insights into microstructural design for enhancing creep resistance are also discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 83, 15 January 2015, Pages 137-148
نویسندگان
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