Effect of pre-oxidation on the hot corrosion of CoNiCrAlYRe alloy

Chen, L.-C.; Zhang, C.; Yang, Zhigang

doi:10.1016/j.corsci.2010.09.045

Cited by 38 publications

(8 citation statements)

References 23 publications

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“…MCrAlX coatings (M for Ni and/or Co, X for minor elements) are widely used to protect superalloys against high-temperature oxidation and heat corrosion in gas turbine engines, either as overlays or as bond coats for TBCs (Thermal barrier coatings) [1][2][3]. The protection offered by MCrAlX coatings against high-temperature oxidation relies on the performance of a thermally grown oxide (TGO) scale formed at the coating-gas interface [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Zhang

Peng

et al. 2018

Coatings

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MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited on an Inconel-792 substrate using high velocity oxygen fuel (HVOF). The samples were subjected to isothermal oxidation tests in laboratory air at 900, 1000, and 1100 • C and a cyclic oxidation test between 100 and 1100 • C with a 1-h dwell time at 1100 • C. It was observed that the coating with Ce showed a much higher oxidation rate than the coating with Y + Ru under both isothermal and cyclic oxidation tests. In addition, the Y + Ru-doped coating showed significantly lower β phase depletion due to interdiffusion between the coating and the substrate, resulting from the addition of Ru. Simulation results using a moving phase boundary model and an established oxidation-diffusion model showed that Ru stabilized β grains, which reduced β-depletion of the coating due to substrate interdiffusion. This paper, combining experiment and simulation results, presents a comprehensive study of the influence of Ce and Ru on oxidation behavior, including an investigation of the microstructure evolution in the coating surface and the coating-substrate interface influenced by oxidation time.

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Section: Introductionmentioning

confidence: 99%

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Zhang

Peng

et al. 2018

Coatings

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show abstract

“…MCrAlX coatings (M for Ni and/or Co, X for minor elements) are widely used to protect the superalloys against high-temperature oxidation and hot corrosion in gas turbine engines. The protection offered by MCrAlX coatings against high-temperature oxidation relies on the performance of a thermally grown oxide (TGO) scale formed at the coating-gas interface [1,2]. A continuous and dense α-Al2O3 of hexagonal close-packed structure is desired for its resistance against diffusion of oxygen ions as well as high thermal and chemical stabilities [1].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Element Effect on High Temperature Oxidation of HVOF NiCoCrAlX Coatings

Zhang¹,

Peng²,

Li³

et al. 2018

Preprint

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MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been widely used to protect hot components in gas turbines against oxidation and hot corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behaviour is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y+Ru and Ce, respectively, were deposited on Inconel-792 substrate by HVOF. The samples were subjected to isothermal oxidation test in laboratory air at 9000, 1000, 1100 ºC and cyclic oxidation test between 100 ºC and 1100 ºC with 1 hour dwell time at 1100 ºC. It was observed that the coating with Ce shows a much higher oxidation rate than the coating with Y+Ru under both isothermal and cyclic oxidation tests. Besides, β-depletion due to interdiffusion between coating and substrate was significantly lower with Ru addition. Simulations results using both a moving phase boundary model and an established oxidation-diffusion model show that Ru stabilize β grains which reduces β-depletion of coating due to substrate interdiffusion. This paper presents a comprehensive study of the influence of Ce and Ru on oxidation behaviour including investigation of the microstructure evolution influenced by oxidation time at coating surface and coating-substrate interface combining experiment and simulation results.

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“…To prolong the service life of the parts, numerous efforts have been carried out to improve the oxidation and hot corrosion resistance of Ni-based superalloys. On the one hand, surface modification techniques, such as cladding, flame plating, and alumetizing, are widely used [9][10][11]. On the other hand, many elements or additives are added in Ni-based superalloys to improve their oxidation and hot corrosion properties at high temperature [12][13][14].…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Influence of Nb and Y on Hot Corrosion Behavior of Ni–Cr-based Superalloys

Weng

Chen

et al. 2014

Materials and Manufacturing Processes

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The hot corrosion behaviors of new-type Ni-Cr-based superalloys were investigated at elevated temperature. The effect of Nb or/and Y on hot corrosion resistance was investigated by corrosion kinetics. Surface morphology of the corrosion products was observed by SEM and the phase constituents were analyzed by XRD. Results showed that the corrosion scales of the Ni-Cr-based alloys consisted of Cr 2 O 3 , Al 2 O 3 , TiO 2 , and NiCr 2 O 4 . NiO was only detected in the alloy without Nb and Y. With the addition of Nb or/and Y, the hot corrosion resistance of the alloy was notably improved. The action mechanisms of Nb and Y were discussed in this study.

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Effect of pre-oxidation on the hot corrosion of CoNiCrAlYRe alloy

Cited by 38 publications

References 23 publications

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Investigation of Element Effect on High Temperature Oxidation of HVOF NiCoCrAlX Coatings

Influence of Nb and Y on Hot Corrosion Behavior of Ni–Cr-based Superalloys

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