کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1548279 | 997730 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
The creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γⲠprecipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γⲠphase in the alloy transformed into the rafted structure along the direction vertical to the stress axis. The dislocations slipping and climbing over the rafted γⲠphase are attributed the deformation mechanism of the alloy during steady-state creep. The (1/2)ã1 1 0ã dislocations slipping in the γ matrix and ã1 1 0ã super-dislocations shearing into the γⲠphase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Natural Science: Materials International - Volume 24, Issue 3, June 2014, Pages 266-273
Journal: Progress in Natural Science: Materials International - Volume 24, Issue 3, June 2014, Pages 266-273
نویسندگان
Haofang Sun, Sugui Tian, Ning Tian, Huichen Yu, Xianlin Meng,