کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7881102 | 1509596 | 2014 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evolution of manganese-nickel-silicon-dominated phases in highly irradiated reactor pressure vessel steels
ترجمه فارسی عنوان
تکامل فازهای منگنز-نیکل-سیلیکون در فولادهای سرامیکی فشار بالا رآکتور
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کلمات کلیدی
آسیب تابشی، توموگرافی پروب اتم بارش، ضعف اشباع،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
Formation of a high density of Mn-Ni-Si nanoscale precipitates in irradiated Cu-free and Cu-bearing reactor pressure vessel steels could lead to severe unexpected embrittlement. Models long ago predicted that these precipitates, which are not treated in current embrittlement prediction models, would emerge only at high fluence. However, the mechanisms and variables that control Mn-Ni-Si precipitate formation, and their detailed characteristics, have not been well understood. High flux irradiations of six steels with systematic variations in Cu and Ni contents were carried out at â¼295 °C to high and very high neutron fluences of â¼1.3 Ã 1020 and â¼1.1 Ã 1021 n cmâ2. Atom probe tomography shows that significant mole fractions of Mn-Ni-Si-dominated precipitates form in the Cu-bearing steels at â¼1.3 Ã 1020 n cmâ2, while they are only beginning to develop in Cu-free steels. However, large mole fractions of these precipitates, far in excess of those found in previous studies, are observed at 1.1 Ã 1021 n cmâ2 at all Cu contents. At the highest fluence, the precipitate mole fractions primarily depend on the alloy Ni, rather than Cu, content. The Mn-Ni-Si precipitates lead to very large increases in measured hardness, corresponding to yield strength elevations of up to almost 700 MPa.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 80, November 2014, Pages 205-219
Journal: Acta Materialia - Volume 80, November 2014, Pages 205-219
نویسندگان
Peter B. Wells, Takuya Yamamoto, Brandon Miller, Tim Milot, James Cole, Yuan Wu, G. Robert Odette,