Effect of the cooling rate on microstructure and hardness of MAR-M247 Ni-based superalloy

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• 作者：Srdjan Milenkovic^a ; ^{srdjan.milenkovic@imdea.org} ; Ilchat Sabirov^a ; Javier LLorca^a ; ^b
• 关键词：Solidification ; Cooling rate ; Microstructure ; Ni-based superalloy
• 刊名：Materials Letters
• 出版年：2012
• 出版时间：15 April, 2012
• 年：2012
• 卷：73
• 期：Complete
• 页码：216-219
• 全文大小：571 K

文摘

The effect of cooling rate on the microstructure of MAR-M247 Ni-based superalloy was investigated via physical simulation of the casting process. Solidification experiments with cooling rates in the range of 0.25-10 K/s showed smooth temperature profiles with measured cooling rates matching the set values. The MAR-M247 showed cellular (0.25 K/s) and dendritic (1, 5 and 10 K/s) microstructures. Microconstituents also varied with cooling rates: ¦Ã/¦Ã?matrix with carbides and ¦Ã/¦Ã?eutectic at 0.25 K/s, ¦Ã/¦Ã?matrix with carbides at 1 K/s, and ¦Ã/¦Ã?matrix with carbides and ¦Ã/MC eutectic at 5 and 10 K/s. Moreover, the secondary dendritic arm spacing decreased and the hardness increased with the increase in the cooling rates.