Stress corrosion of Ni-based superalloys
Stress corrosion of Ni-based superalloys
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DOI：
10.1080/09603409.2017.1392414
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发表时间：
2018-01-01
影响因子：
1.3
通讯作者：
Simms, N. J.
中科院分区：
文献类型：
--
作者：
Brooking, L.;Sumner, J.;Simms, N. J.
燃气轮机的发展提高了燃料效率，导致叶片平台下区域的工作温度逐渐升高。这些地区传统上被认为是低风险地区。然而，较高的金属温度与来自冷却空气系统的应力和污染物沉积相结合，可能导致复杂的降解机制。在热腐蚀环境中，在一定范围的应力下对C形环试样进行了静态应力腐蚀试验。暴露时间超过100 h后，在C形环中观察到裂纹。扫描电子显微镜（SEM）系统用于图像裂纹和沉积物，以提高对机制的理解。有限元分析（FEA）已被用来模拟测试条件下的应力强度。CMSX-4试样静态应力结合热腐蚀表现出显着的材料降解（裂纹萌生和扩展），这表明一个组合的应力腐蚀机制导致开裂。
The development of gas turbines to increase fuel efficiency is resulting in progressively higher operating temperatures in the under platform regions of the blades. These regions have traditionally been considered low risk areas. However, higher metal temperatures combined with stresses and the deposition of contaminants from the cooling air system may result in complex degradation mechanisms. Static stress corrosion testing has been conducted on C-ring specimens at a range of stresses in a hot corrosion environment. Cracks were observed in C-rings after exposure times greater than 100 h. Scanning electron microscopy (SEM) systems were used to image cracks and characterise deposits to improve understanding of the mechanism. Finite element analysis (FEA) has been used to model the stress intensity under test conditions. CMSX-4 specimens subject to static stresses combined with hot corrosion demonstrated significant material degradation (crack initiation and propagation) suggesting a combined stress corrosion mechanism resulting in cracking.