Effect of Interdiffusion Between Ni-Al Coating and Substrate on Microstructure Stability of Single Crystal Superalloy

doi:10.11902/1005.4537.2016.130

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 497-504 DOI: 10.11902/1005.4537.2016.130

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Effect of Interdiffusion Between Ni-Al Coating and Substrate on Microstructure Stability of Single Crystal Superalloy

Jingyong SUN¹(

),Qiushi LI¹,Hongbo GUO²,Shengkai GONG²

1. School of Materials Science and Engneering, Beihang University, Beijing 100191, China
2. School of Energy and Power Engineering, Beihang University, Beijing 100191, China

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Abstract

The coatings applied on gas turbine blade of single crystal superalloy are required to have a high adhesive strength with the substrate. The interdiffusion between coatings and substrate alloys is concerned due to its impact on the microstructure stability of the superalloy substrates. In view of the importance of the interdiffusion behavior, Ni-Al coatings with 10.90%(mass fraction),14.30% and 17.60% Al respectively are prepared on the second generation single crystal superalloy René N5 by electron beam-physical vapor deposition (EB-PVD). Correspondingly, the coatings are composed of γ+γ ' two phases, γ ' single phase and γ '+β two phases, respectively. The effect of the interdiffusion between Ni-Al coatings and single crystal substrate on the microstructure stability of the superalloy substrate is investigated. It is found that the γ/γ ' coherent structure of the single crystal substrate is destroyed by inward diffusion of Al. However, the depth of the destroyed zone in the substrate has not positive correlation with Al concentration. For the coating with 14.30% Al, the interdiffusion induced damage of the substrate is most severe. The increasing of Al concentration in the Ni-Al coatings promotes the formation of TCP phase in the diffusion zone of the substrate.

Key words: Ni-Al coating EB-PVD single crystal superalloy interdiffusion

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	Jingyong SUN
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	Hongbo GUO
	Shengkai GONG

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Jingyong SUN,Qiushi LI,Hongbo GUO,Shengkai GONG. Effect of Interdiffusion Between Ni-Al Coating and Substrate on Microstructure Stability of Single Crystal Superalloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 497-504.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.130 OR https://www.jcscp.org/EN/Y2016/V36/I5/497

Table 1 Compositions of EB-PVD target(mass fraction / %)

Table 2 Compositions of René N5 superalloy

Table 3 Compositions of three Ni-Al coatings

Fig.1 Phase compositions of three Ni-Al coatings initially deposited and annealed at 1000 ℃ for 100 h

Fig.2 Cross sections (a, c, e) and element distributions (b, d, f) of R-25 coating deposited initially (a, b) and annealed for 5 h (c, d) and 100 h (e, f)

Fig.3 Cross sections (a, c, e) and element distributions (b, d, f) of R-30 coating deposited initially (a, b) and annealed for 5 h (c, d) and 100 h (e, f)

Fig.4 Cross sections (a, c, e) and element distributions (b, d, f) of R-35 coating deposited initially (a, b) and annealed for 5 h (c, d) and 100 h (e, f)

Fig.5 Variations of depth of SDZ or SRZ with heat treatment time in vacuum

Fig.6 EPMA elemental distributions of Ni (a), Al (b), Re (c), Cr (d), W (e) and Mo (f) of the cross section of N5 superalloy with R-30 coating after annealling for 5 h

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