کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1573148 | 1514670 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure evolution and creep behaviors of a directionally solidified nickel-base alloy under long-life service condition
ترجمه فارسی عنوان
تکامل میکرو سازمانی و رفتارهای خزش یک آلیاژ پایه نیکل مداوم تثبیت شده در شرایط خدمات طولانی مدت
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کلمات کلیدی
سوپرآلیاژ نیکل پایه به طور مستقیم مرطوب، خزش بارگیری از فاز ² ² ²، پارامترها و غلط، مکانیزم تغییر شکل
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
By means of creep properties measurement, microstructure observation and lattice parameters measurement, the microstructure evolution and creep behaviors of a directionally solidified nickel-based alloy under long-life service condition are investigated. The results show that the creep life of the alloy at 980 °C/90 MPa is measured to be 9714 h. During creep, the various morphologies of γⲠand γ phases display in the different regions of sample. Wherein, the γⲠphase in the region near fracture is firstly transformed into the rafted structure, while the γⲠphase in the stress-free region exhibits the bunch-like structure. The size of the rafted γⲠphase in thickness increases from 0.4 µm to 1.8 µm as the time of creep prolongs to 9714 h, the coarsening regularity of the rafted γⲠphase in thickness obeys the parabolic law. Moreover, the parameters and misfits of γâ²/γ phases in the alloy increase with the creep time. When the creeping time is less than 3000 h, the deformation mechanisms of alloy are dislocations slipping in the matrix channels and climbing over the rafted γⲠphase. In the later stage of creep, the deformation mechanisms of alloy are dislocations slipping in the matrix channels and shearing into the rafted γⲠphase, the alternate activation of the main/secondary slipping dislocations promotes the coarsening and twisting of the rafted γâ²/γⲠphases. Wherein, the coarsening of the rafted γⲠphase is thought to be a main reason of the alloy having a better creep resistance and longer life.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 673, 15 September 2016, Pages 391-399
Journal: Materials Science and Engineering: A - Volume 673, 15 September 2016, Pages 391-399
نویسندگان
Sugui Tian, Baoshuai Zhang, Huichen Yu, Ning Tian, Qiuyang Li,