標題: The effects of carbon content on the microstructure and elevated temperature tensile strength of a nickel-base superalloy
作者: Wei, Chao-Nan
Bor, Hui-Yun
Chang, Li
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Carbon;Grain refinement;Nickel-base superalloy;Hot isostatic pressing;Microstructure;Tensile test
公開日期: 25-六月-2010
摘要: This study investigates how carbon content affects the microstructure and elevated temperature tensile strength of fine-grain CM-681LC superalloy. Experimental results indicate that increasing the carbon content from 0.11 to 0.15 wt% increases the total area fraction of carbides considerably. However, the two alloys exhibit similar carbide shapes and sizes, probably because the short solidification time in the fine-grain process limits the growth of carbides. Besides, carbon addition significantly reduces the area fraction of gamma-gamma' eutectic phases from 8.6 to 5.3% because the eutectic phase forming elements are consumed by (Ta, Hf)C carbides and the carbides occupy the position of gamma-gamma' eutectic phases during the solidification. Further, the carbon addition improves the mechanical strength by about 6% and the elongation by about 50% in tensile tests at 760 degrees C and yields favorable tensile performance at elevated temperature. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.msea.2010.03.053
http://hdl.handle.net/11536/5248
ISSN: 0921-5093
DOI: 10.1016/j.msea.2010.03.053
期刊: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume: 527
Issue: 16-17
起始頁: 3741
結束頁: 3747
顯示於類別:期刊論文


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