Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

Xu, Hui; Yang, Shufeng; Wang, Enhui; Liu, Yunsong; Guo, Chunyu; Hou, Xinmei; Zhang, Yanling

doi:10.1007/s12613-023-2687-5

Cited by 4 publications

(4 citation statements)

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“…The EDS results show that there are some particles with higher Ti content (11.02 wt.%) on the surface of Y4 alloy. It may be due to the faster diffusion rate of Ti 4+ in the oxide layer [ 30 , 31 ]. In contrast, the surface of Y1 and Y2 alloys is relatively flat, and the structure is relatively dense.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, EDS results indicated that the contents of Ti (16.71–20.62 wt.%) and Nb (10.86–11.32 wt.%) in the oxide particles of Y0 and Y4 alloys increased, while the content of Cr (20.91–25.75 wt.%) decreased significantly. It may be due to the faster outward diffusion rates of the metal cations Ti 4+ and Nb 5+ , which react with oxygen in the air to form Nb-Ti-rich oxide particles [ 30 , 31 ]. The loose structure of the surface oxide scale and the spalling of the oxide scale provide a channel for the internal diffusion of oxygen, which will accelerate the oxidation of the alloy.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, despite the low Ti content (0.65–1.15 wt.%) in the matrix, it is more active than Cr, and the diffusion rate of Ti 4+ in the Cr 2 O 3 oxide layer is greater than that of Cr 3+ [ 30 , 31 ]. Therefore, it will diffuse between different oxide layers throughout the oxidation process and combine with oxygen to form TiO 2 or titanium-containing oxides.…”

Section: Discussionmentioning

confidence: 99%

“…This also implies that the growth of Al 2 O 3 proceeds by inward diffusion of oxygen rather than by outward diffusion of aluminum ions in the oxide. Consequently, Al 2 O 3 is formed in the innermost layer of the oxide scale [ 30 ]. This is consistent with the results of this study.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Yttrium Additions on the High-Temperature Oxidation Behavior of GH4169 Ni-Based Superalloy

Wang,

Liu,

Yang

et al. 2024

Materials

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The effect of the active element yttrium and its content on the oxidation behavior of GH4169 Ni-based superalloy at extreme temperature was studied by isothermal oxidation experiments. The results show that the oxide scale of GH4169 alloy presents a multi-layer structure, in which the continuous and dense Cr2O3 oxide layer is located in the subouter layer (II layer) and the continuous Nb-rich layer is in the subinner layer (III layer). These layers can inhibit the diffusion of oxygen and alloying elements, preventing the further oxidation of the alloy. The appropriate addition of yttrium can promote the selective oxidation of Cr element, reduce the thickness of the oxide scale and the oxidation rate of the alloy, inhibit the formation of voids at the interface of the oxide scale/alloy matrix, improve the resistance of the alloy to spalling as well as the adhesion of the oxide scale, and improve the high-temperature oxidation resistance of the alloy. Of those tested, the alloy containing 0.04 wt.%Y has the lowest oxidation weight gain, the slowest oxidation rate, and less oxide scale spalling. Based on this, the effect of yttrium on the high-temperature oxidation behavior of GH4169 Ni-based superalloy and its mechanism were revealed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%