The investigation of carbides evolution in a cobalt-base superalloy at elevated temperature

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• 作者：Weimin Gui^a ; ^b ; Hongyu Zhang^a ; Min Yang^c ; Tao Jin^a ; Xiaofeng Sun^a ; Qi Zheng^a ; ^{qzheng@imr.ac.cn}
• 关键词：Cobalt-base superalloy ; M7C3 decomposition ; MC degeneration ; Microstructure ; Heat treatment
• 刊名：Journal of Alloys and Compounds
• 出版年：2017
• 出版时间：25 February 2017
• 年：2017
• 卷：695
• 期：Complete
• 页码：1271-1278
• 全文大小：3658 K
• 卷排序：695

文摘

The in-situ transformation of M7C3 to M23C6 is first observed directly in cobalt-base superalloys. M23C6 carbide nucleates at the M7C3/matrix interface due to the coherent relationship between M23C6 carbide and the matrix. The primary MC degenerates and releases of a large amount of Ti and W at elevated temperature. The primary MC decomposes into M6C at 1140 °C and dissolves partially into the matrix above 1140 °C.