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首页> 外文会议>International symposium on superalloys 718, 625, 706 and various derivatives >MECHANISTIC CONSIDERATIONS OF OXYGEN ENHANCED CRACK GROWTH IN INCONEL 718
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MECHANISTIC CONSIDERATIONS OF OXYGEN ENHANCED CRACK GROWTH IN INCONEL 718

机译：氧气的机械考虑意见的氧气增强了818的裂缝增长

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A coordinated, multidisciplinary study was conducted to elucidate the mechanism for oxygen enhanced crack growth in Inconel 718 at high temperatures. Sustained-load tests were conducted in high-purity argon and oxygen, at 873 to 973 K, to characterize the kinetics of crack growth. The reactivity of the alloy, Nb, NbC and Ni_3Nb with oxygen was determined by x-ray photoelectron spectroscopy (XPS). Crack growth experiments, in oxygen at 973 K, were interrupted and the specimens were charged with hydrogen and fractured in UHV to determine the state of oxidation of various elements, particularly ahead of the crack tip. The existence of a damage zone ahead of the crack tip had been demonstrated previously by reloading interrupted specimens of comparable alloys in argon at lower temperatures and stress intensity levels. A mechanism for oxygen enhanced crack growth in Inconel 718, based on the formation of a brittle niobium oxide film ahead of the crack tip from the oxidation of grain boundary and Nb-rich carbides, is proposed and discussed.
机译：进行协调的多学科研究，以阐明在高温下的氧气增强裂缝增强的机制。在873至973k的高纯度氩气和氧中进行缓慢载荷试验，以表征裂纹生长的动力学。通过X射线光电子能谱（XPS）测定合金，Nb，Nbc和Ni_3Nb与氧的反应性。在973k的氧气中裂纹生长实验被中断，并将标本用氢气加入，以UHV裂缝，以确定各种元素的氧化状态，特别是在裂缝尖端之前。先前通过在较低温度和应力强度水平下重新加载氩气中的相当合金的中断标本来证明在裂纹尖端前面的存在损伤区域。提出并讨论基于从裂纹尖端的裂纹尖端的脆性铌氧化物膜的形成，并讨论了氧气增强抗裂纹增强的机理。

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