کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8148782 | 1524344 | 2018 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of withdrawal rate and starter block size on crystal orientation of a single crystal Ni-based superalloy
ترجمه فارسی عنوان
اثرات نرخ برداشت و اندازه بلوک استارت بر روی جهت گیری کریستال یک ابررسانای مبتنی بر نیکل کریستال
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کلمات کلیدی
ابررسانای بر پایه نیکل، جامد شدن کریستال تک نرخ برداشت، جهت گیری کریستال،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
Fabrication of single crystal (SC) Ni-based gas turbine blades with a minimum crystal misorientation has always been a challenge in gas turbine industry, due to its significant influence on high temperature mechanical properties. This paper reports an experimental investigation and numerical simulation of the SC solidification process of a Ni-based superalloy to study effects of withdrawal rate and starter block size on crystal orientation. The results show that the crystal misorientation of the sample with 40â¯mm starter block height is decreased with increasing withdrawal rate up to about 9â¯mm/min, beyond which the amount of misorientation is increased. It was found that the withdrawal rate, height of the starter block and temperature gradient are completely inter-dependent and indeed achieving a SC specimen with a minimum misorientation needs careful optimization of these process parameters. The height of starter block was found to have higher impact on crystal orientation compared to the withdrawal rate. A suitable withdrawal rate regime along with a sufficient starter block height was proposed to produce SC parts with the lowest misorientation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 485, 1 March 2018, Pages 19-27
Journal: Journal of Crystal Growth - Volume 485, 1 March 2018, Pages 19-27
نویسندگان
M. Rezaei, A. Kermanpur, F. Sadeghi,