The effect of tensile stress on oxidation behavior of nickel-base single crystal superalloy

Haiqing Pei, Meng Li, Ping Wang, Xiaohu Yao, Zhixun Wen, Zhufeng Yue

科研成果: 期刊稿件文章同行评审

43 引用 (Scopus)

摘要

The oxidation behavior of a nickel-based single crystal superalloy at two temperatures (1000 °C/1050 °C) and different stress levels (40 / 60 / 120 MPa) was studied through experimental design. At 1000 °C and 1050 °C, the oxide structures are mainly three layers: the outer layer (Ni, Co) O, the middle layer of complex spinel phases rich in Ni, Co, Cr, Ta and W, the inner layer of α-Al2O3. Under the oxide layer forms a γ′ phase disappearing layer due to the selective oxidation of Al. The dynamics of its thickness variation can be fitted by parabola law under different temperatures and stresses. After 400 h of oxidation, the alloy undergoes significant internal nitridation at higher stresses. The oxidation rate increased significantly with the increase of the tensile stress level. The morphologies of the oxide are changed by the applied tensile stress. In the early stage, the tensile stress offsets the self-generated compressive stress in the oxide film, and generates tensile stress in the oxide film, which increases the ion diffusion rate and oxygen vacancy concentration in the oxide layer, thereby improving the oxidation rate of the alloy. In the later stage, the thickness of the oxide layer increases, the interface adhesion decreases, and the effective cross-sectional area of the matrix continues to shrink. The greater tensile stress in the oxide film promotes itself peel off.

源语言英语
文章编号109737
期刊Corrosion Science
191
DOI
出版状态已出版 - 10月 2021

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