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Metals 2016, 6(3), 64; doi:10.3390/met6030064

Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy

1
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2
Luoyang Ship Material Research Institute, Luoyang 471023, China
*
Author to whom correspondence should be addressed.
Academic Editor: Johan Moverare
Received: 27 January 2016 / Revised: 24 February 2016 / Accepted: 29 February 2016 / Published: 15 March 2016
(This article belongs to the Special Issue Superalloys)
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Abstract

The damaged K465 nickel-based superalloy parts were repaired by laser forming repair technology. The cracking characteristics and grain boundary liquation in heat affected zones were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It was found that the cracks originated from the heat-affected zone and extended to the repaired zone. The calculation by Thermol-Cale software showed that the larger γ′ particles at grain boundaries partly dissolved in the γ phase, which made the solutes’ concentration at the γ′/γ interface meet the eutectic-type liquation reaction condition of γ + γ′ → L. Then, grain boundaries liquation occurred and liquid films appeared with the temperature increasing in a rapid heating process. However, the intragranular γ′ phase completely dissolved into the γ phase with no devotion to the liquid film. The dissolution of M5B3 borides at grain boundaries could promote grain boundary liquation. View Full-Text
Keywords: laser forming repairing; K465 nickel-based superalloy; cracking; grain boundary liquation; γ′ phase laser forming repairing; K465 nickel-based superalloy; cracking; grain boundary liquation; γ′ phase
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Q.; Lin, X.; Wang, X.; Yang, H.; Song, M.; Huang, W. Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy. Metals 2016, 6, 64.

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