NiCrAlYSi涂层/DD6单晶高温合金界面再结晶和互扩散行为

doi:CNKI:11-1929/V_20101028.1820.001

Abstract

Abstract: In this paper, the NiCrAlYSi coatings are deposited by electron beam physical vapor deposition (EB-PVD) on nickel-based single crystal superalloy DD6. Inter-diffusion and recrystallization behaviors at the coating/superalloy interface of the coated superalloy substrates are investigated at 1 323 K by X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS) and transmission electron microscopy (TEM). The results indicate that a recrystallization zone of ~7 μm thickness is formed at the coating/substrate interface of the blasted sample after 4 h vacuum heat-treatment at 1 323 K. Such recrystallization zone is not observed in the unblasted sample even after 50 h heat-treatment. However, a recrystallization zone of ~15 μm thickness is formed in the sample after 75 h. After 500 h isothermal oxidation in air at 1 323 K, a recrystallization zone of ~28 μm thickness is formed in the unblasted sample. Besides, a so-called secondary reaction zone of ~60 μm, basically consisting of topologically close-packed phase (TCP) needles, is formed in the superalloy. The precipitate of TCP is enriched in W, Re and Ta.

Key words: single crystal superalloy, coating, inter-diffusion, recrystallization, secondary reaction zone

CLC Number:

YAO Rui, GUO Hongbo, PENG Hui, GONG Shengkai. Recrystallization and Inter-diffusion Behaviors of NiCrAlYSi Coating/DD6 Single Crystal Superalloy System[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2011, 32(4): 751-757.

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Recrystallization and Inter-diffusion Behaviors of NiCrAlYSi Coating/DD6 Single Crystal Superalloy System

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