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Effect of Heat Treatment on the Microstructural Evolution of Pt-aluminide Coated Ni-based Superalloy  

Joo, D. (School of Nano & Advanced Materials Engineering, Changwon National University)
Park, S.H. (School of Nano & Advanced Materials Engineering, Changwon National University)
Jung, Y.G. (School of Nano & Advanced Materials Engineering, Changwon National University)
Lee, K.H. (Surface Engineering Department, Korea Institute of Machinery & Materials)
Kim, C.S. (Sechang Industrial)
Publication Information
Journal of the Korean Society for Heat Treatment / v.19, no.2, 2006 , pp. 103-108 More about this Journal
Abstract
Microstructural evolution of Pt-aluminide coated Ni-based superalloy has been investigated with ductilization heat treatment. The Pt coat was prepared on the superalloy and then aluminide coating was conducted using a pack cementation process. Samples were heat-treated at $1050^{\circ}C$ for 2 hrs and the microstructure and element analysis were preformed. A various precipitated compounds were observed within the coating layer and the diffusion region in the Pt-aluminide coating and heat treatment, indicating that the bi-phase compounds of $PtAl_2$ and NiAl were performed during the Pt-aluminide coating, whereas $M_{23}C_6$, MC, $Ni_3Al$ and ${\sigma}$ phases were precipitated in the inter-diffusion region. The bi-phase compounds of $PtAl_2$ and NiAl were transformed into the single phase compound of $PtAl_2$ with the heat treatment, increasing the amount of carbide and ${\sigma}$ phase.
Keywords
Superalloy; Pt-aluminide coating; Precipitation; Ductilization; Microstructure;
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