Effect of Cr and Al on Hot Corrosion Behavior of Low Thermal Expansion Thermo-span Superalloy at 650℃

doi:10.11901/1005.3093.2013.883

Chinese Journal of Materials Research

2014, Vol. 28

Issue (8): 627-632 DOI: 10.11901/1005.3093.2013.883

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Effect of Cr and Al on Hot Corrosion Behavior of Low Thermal Expansion Thermo-span Superalloy at 650℃

Yaru SUN(

),Suai ZHAO,Daile ZHANG,Qing HE

Shenyang University of Technology, Shenyang 110870

Cite this article:

Yaru SUN,Suai ZHAO,Daile ZHANG,Qing HE. Effect of Cr and Al on Hot Corrosion Behavior of Low Thermal Expansion Thermo-span Superalloy at 650℃. Chinese Journal of Materials Research, 2014, 28(8): 627-632.

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Abstract

The hot corrosion behavior of modified and conventional Thermo-Span alloys in 75%Na₂SO₄+25%NaCl molten salt at 650℃ for 100h was investigated by means of thermogravimetry (TG) and scanning electron microscopy equipped with energy dispersive X-ray Spectrum (EDS). The results show that the corrosion product consisted of oxides and sulfides exhibits a three layered structure: the external layer consists of Fe、Co and Cr oxides, in addition, Al and Co oxides also exist in this layer of the modified alloy; the intermediate layer is mixed oxides composed of Al、Cr and Ni and sulfides formed in the inner layer consisted of Ni and Co, the inner sulfidation layer in standard alloy is thicker than that in the modified alloy. For the modified alloy with higher Al addition, an aluminum rich oxide scale can form at the interface oxide scale/substrate , which can block the outwards diffusion of Fe and Co, and the inwards diffusion of O and S elements hence enhanced the hot corrosion resistance of the modified Thermo-Span alloy .

Key words: materials failure and protection hot corrosion thermo-span superalloy corrosion rate corrosion layer

Received: 22 November 2013

Fund: *Supported by Research Program of Liaoning Province Department of Education No.2008502.

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.883 OR https://www.cjmr.org/EN/Y2014/V28/I8/627

Fig.1 Kinetics curves of hot corrosion of experimental alloys at 650℃ (a) standard alloy; (b) modified alloy

Fig.2 Square of mass gain of experimental alloys versus oxidation time at 650℃ (a) standard alloy; (b) modified alloy

Fig.3 Surface morphologies and EDS of Thermo-Span alloy after heat corrosion at 650℃ for 100 h (a) surface morphologies; (b) EDS of 1 point in Fig.3a; (c) EDS of 2 point in Fig.3a; (d) EDS of 3 point in Fig.3a

Fig.4 Surface morphologies and EDS of oxide on surface of modified alloy after heat corrosion at 650℃ for 100 h (a)(b)(c) surface morphologies; (d) (e) EDS of 1 point and of 2 point in Fig.4a; (f) EDS of 3 point in Fig.4b; (g) EDS of 4 point in Fig.4c

Fig.5 Cross-sectional SEM morphologies and the element maps of standard alloy after hot corrosion at 650℃ for 100 h (a) morphologies of alloy; (b) O; (c) Co; (d) Cr; (e) Fe; (f) Nb; (g) Ti; (h) S; (i) Al; (j) Ni

Fig.6 Cross-sectional SEM morphologies and the element maps of modified Thermo-Span alloy after hot corrosion at 650℃ for 100 h (a) morphologies of modified alloy; (b) O; (c)Co; (d) Cr; (e) Fe; (f) Nb; (g) Ti; (h) S; (i) Al; (j) Ni

Fig.7 Morphologies and EDS of sulfur of standard alloy

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