کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1576350 | 1514774 | 2013 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Strengthening behavior of Nb in the modified Nimonic 80A
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The microstructures and mechanical properties of Nb modified Nimonic 80A were investigated. Nb increases the precipitate temperature and weight fraction of γⲠphase. The substitution of Ti by Nb and the precipitate of (Nb, Ti)C lead to the decrease of Ti composition in γⲠphase after full heat treatment. The diffusion of Nb from γ to γⲠphase makes part of the fine γâ²2 particles coexist with the coarse γâ²1 particles. The δ-Ni3Nb phase precipitates in γ matrix channel and exhibits an orientation relationship with the blocky (Nb, Ti)C at 845 °C: (100)δ â (100)MC and [010]δ â [010]MC. Precipitate of (Nb, Ti)C in γ matrix channel and at grain boundaries suppresses γⲠcoarsening and grain boundary sliding, respectively. The (Nb, Ti)C precipitated at grain boundary also suppresses the coalescence of cavities at high temperature. The stress-rupture life of the 1.5 wt% Nb modified Nimonic 80A increases by about 25.4% at 750 °C/310 MPa and the creep life increases from less than 500 h to more than 1300 h at 750 °C/240 MPa. The diffusion of Nb element into γⲠphase and the precipitates of carbides significantly improve the mechanical properties of Nimonic 80A.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 569, 1 May 2013, Pages 27-40
Journal: Materials Science and Engineering: A - Volume 569, 1 May 2013, Pages 27-40
نویسندگان
Yulai Xu, Qingxuan Ran, Jun Li, Jianchao Peng, Xueshan Xiao, Xiuli Cao, Guoqing Jia,