کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7934758 | 1512941 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coupling effects of tungsten and molybdenum on microstructure and stress-rupture properties of a nickel-base cast superalloy
ترجمه فارسی عنوان
اثر متقابل تنگستن و مولیبدن بر روی ریزساختار و خواص پارگی نانوکامپوزیت
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
In order to comprehensively understand the forming mechanism of abnormal phases solidified in a nickel-base cast superalloy with additives of tungsten and molybdenum, the coupling effects of W and Mo on the microstructure and stress-rupture properties were investigated in this paper. The results indicated that the precipitation of primary α-(W, Mo) phase depended tremendously on the amount of W and Mo addition. When the total amount of W and Mo was greater than 5.79â¯at%, α-(W, Mo) phase became easily precipitated in the alloy. With increasing of Mo/W ratio, the dendrite-like α-(W, Mo) phases were apt to convert into small bars or blocky-like phases at the vicinities of γâ²/γ eutectic. The morphological changes of α-(W, Mo) phase can be interpreted as the non-equilibrium solidification of W and Mo in the alloy. Since the large sized α-(W, Mo) phase has detrimental effects on stress-rupture properties in as-cast conditions, secondary cracks may mainly initiate at and then propagate along the interfaces of brittle phases and soft matrix. During exposing at 1100â¯â for 1000â¯h, the α-(W, Mo) phases transformed gradually into bigger and harder M6C carbide, which results in decreasing of stress-rupture properties of the alloy. Finally, the alloy with an addition of 14W-1Mo(wt%) maintained the longest stress lives at high temperatures and therefore it revealed the best microstructure stability after 1100â¯â/1000â¯h thermal exposure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Natural Science: Materials International - Volume 28, Issue 1, February 2018, Pages 45-53
Journal: Progress in Natural Science: Materials International - Volume 28, Issue 1, February 2018, Pages 45-53
نویسندگان
Tongjin Zhou, Wei Feng, Huibin Zhao, Yu Meng, Huaxia Zhang, Hongsheng Ding, Zichen Wang,