کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7972321 | 1514618 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and stress-rupture life of high W-content cast Ni-based superalloy after 1000-1100â¯Â°C thermal exposures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure and stress-rupture life of high W-content cast Ni-based superalloy after 1000-1100â¯Â°C thermal exposures Microstructure and stress-rupture life of high W-content cast Ni-based superalloy after 1000-1100â¯Â°C thermal exposures](/preview/png/7972321.png)
چکیده انگلیسی
High W-content cast Ni-based superalloy which can be served as isothermal forging die materials over 1050â¯Â°C was investigated in this paper. Based on the microstructure evolutions, stress-rupture life of the alloy were examined under 1100â¯Â°C /70â¯MPa, where the alloy was evaluated after thermally exposed at 1000, 1050, and 1100â¯Â°C for 100-1000â¯h, respectively. Results showed that increasing of exposure temperature can cause coarsening and coalescing of γⲠprecipitates along with a decreasing in their volume fraction, especially at 1100â¯Â°C. The coarsening rate of the γⲠprecipitates increased with the exposure temperature and followed by the modified Lifshitz-Slyozov-Wagner coarsening theory of Ostwald ripening. The coarsening rate coefficient (k) at 1000, 1050, and 1100â¯Â°C was calculated to be 5.72, 7.40, and 8.71â¯nm/s1/3, respectively. In addition, at those temperatures, it found the blocky M6C carbides in the interdendritic area to be precipitated and coarsened. Furthermore, the M6C carbides linked with each other like a chain wrapped around the grain boundary and along the eutectic γⲠphase. Because of the degradation of the microstructure, the stress-rupture life decreased after thermal exposure, from 94.8â¯h at 1000â¯Â°C to 49.3â¯h at 1100â¯Â°C for 1000â¯h. Finally, in view of the experimental results, a relationship between the microstructural evolution and the stress-rupture life of the alloy was discussed in details.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 725, 16 May 2018, Pages 299-308
Journal: Materials Science and Engineering: A - Volume 725, 16 May 2018, Pages 299-308
نویسندگان
Tongjin Zhou, Hongsheng Ding, Xiuping Ma, Wei Feng, Huibin Zhao, Yu Meng, Huaxia Zhang, Yongmin Lv,