Oxidation behavior in static air and its effect on tensile properties of a powder metallurgy EP962NP nickel-based superalloy

Sun, Bing; Zhang, Tiebang; Song, Lin; Zhang, Lei

doi:10.1016/j.jallcom.2022.167795

Cited by 7 publications

(1 citation statement)

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“…These factors may result in local spalling and failure of the thermal barrier coating [3][4][5]. In the area where the thermal barrier coating is peeled off, the alloy becomes directly exposed to the elevatedtemperature oxidation environment, the alloy oxidizes, and the oxidized area may become the source of defects and cracks that considerably reduce the mechanical properties [6].…”

Section: Introductionmentioning

confidence: 99%

Crack Initiation in Ni-Based Single Crystal Superalloy under Low-Cycle Fatigue-Oxidation Conditions

Wang,

Zhao,

Yue

et al. 2023

Metals

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The mechanism of oxidation-assisted initiation of surface cracks of a fourth-generation Ni-based single crystal superalloy was systematically investigated during low cycle fatigue at 900 °C and 980 °C. The results show that cracks initiate near the surface defects at 900 °C, while they initiate in the surface oxide layer at 980 °C. At 900 °C, the oxidation microcrack initiation in the thicker inner oxidation layer is difficult to connect with the surface oxidation crack, which is an essential reason for the crack growth rate being slower and not becoming the main crack. At 980 °C, microcracks form in the outer oxide layer and quickly connect with microcracks at the surface and inner/outer oxide layer interface, growing into long cracks that become channels for rapid oxygen transport. This accelerates the crack growth rate, and eventually the oxide crack becomes the main crack.

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