کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969381 | 1514350 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Negative influence of rafted γⲠphases on 750â¯Â°C/750â¯MPa creep in a Ni-based single crystal superalloy with 4% Re addition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Specimens with two different γⲠphase microstructures, named as-heat treated sample with cuboidal γⲠphases and pre-rafted sample with N-type rafted γⲠphases, were compared to investigate the negative influence of the rafted γⲠphases on the creep property in a Ni-based single crystal superalloy with 4% Re addition at 750â¯Â°C and 750â¯MPa condition. The results indicated that the sample with cuboidal γⲠphases exhibited a lower creep rate and a longer rupture life compared to that with rafted γⲠphases. Transmission electron microscope examinations showed that lots of fine γⲠphases impeded first the dislocation movement in the channel of γ matrix in the initial primary creep stage before the cuboidal γⲠphases were cut by stacking faults in as-heat treated sample. However, in pre-rafted sample, some existed superdislocations located in rafted γⲠphases and the mismatch stress release at γ/rafted γⲠinterface resulting from pre-rafted treatment not only decreased the creep resistance of rafted γⲠphases, but also weakened the γ/rafted γⲠinterface pinning effect for dislocation movement. Therefore, the rafted γⲠphases were easily cut by superdislocations and stacking faults resulting in a higher creep rate and a shorter creep life.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 137, March 2018, Pages 127-132
Journal: Materials Characterization - Volume 137, March 2018, Pages 127-132
نویسندگان
Wenchao Yang, QuanZhao Yue, Kaili Cao, Fangyou Chen, Jun Zhang, Ruirong Zhang, Lin Liu,