Journal
SCRIPTA MATERIALIA
Volume 127, Issue -, Pages 58-62Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.08.039
Keywords
Laser treatment; Superalloy; Rapid directional solidification; Solidification microstructure; Phase transformations
Categories
Funding
- National High Technology Research and Development Program of China [2014AA041701]
- Joint Funds of NSFC-Liaoning [U1508213]
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The solidification path of single-crystal nickel-base superalloys containing minor carbon was investigated under various laser rapid directional solidification (LRDS) conditions. By controlling the solidification rate, LRDS processing can provide the evidence whether some diffusion-controlled phase transformations occur because such transformations will be suppressed under high cooling rates. Results show that the solidification path and final solidification microstructure depend upon the cooling rate; the microstructure without gamma-gamma ' eutectic can be obtained as long as the cooling rate is high enough. A peritectic transformation in carbon-containing single crystal superalloys was first experimentally verified by controlling the cooling rate during LRDS processing. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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