کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7975081 | 1514669 | 2016 | 49 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of heat treatments on microstructure evolution and mechanical properties of blended nickel-based superalloys powders fabricated by laser powder deposition
ترجمه فارسی عنوان
اثر تیمارهای حرارتی بر تکامل میکروارگانیسم و خواص مکانیکی پودر ابررسانای بر اساس نیکل مخلوط شده با رسوب پودر لیزری
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کلمات کلیدی
ابررسانای بر پایه نیکل، رسوب پودر لیزری، حرارت درمانی، تکامل میکروارگانیسم، ویژگی های مکانیکی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Microstructure evolution and mechanical properties of sample produced by laser powder deposition using blended powders of Mar M247 and Amdry DF3 were studied in the as-deposited and heat treated conditions. In the as-deposited condition, continuous (Cr, W) borides and γ-Ni3B eutectics were observed to segregate in the interdendritic regions. After the two-step aging treatment, the low melting point γ-Ni3B eutectics re-melted. Small size γ-γⲠeutectics and discrete W borides formed during re-solidification. The γⲠstrengthening phase that precipitated out homogeneously in the dendritic cores had an average diameter of 102±26 nm. When annealing was attempted before the aging treatment, both γ-Ni3B eutectics and the surrounding dendrites re-melted, contributing to the coarsening of the γ-γⲠeutectics and the discrete W borides. Gamma prime precipitates with average diameter of 106±30 nm were observed. This microstructure evolution from the re-melting of γ-Ni3B eutectics and development of γ-γⲠeutectics eradicated the risk of strain-age cracks during the two tested heat treatments by backfilling. The coarsening kinetics of γⲠprecipitates in the two heat treated conditions was modeled and showed a good agreement with the experimental observation. The microhardness results showed that the as-deposited condition possessed the highest hardness attributed to the continuous feature of the secondary phases, while the two heat treated conditions presented similar hardness owing to the similar size and volume fraction of γⲠprecipitates. The tensile test results at both ambient and elevated temperatures indicated that the two types of heat treatments increased the tensile properties, especially ductility.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 674, 30 September 2016, Pages 646-657
Journal: Materials Science and Engineering: A - Volume 674, 30 September 2016, Pages 646-657
نویسندگان
Y. Tian, A. Gontcharov, R. Gauvin, P. Lowden, M. Brochu,