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首页> 外文会议>International Symposium on Superalloys 718, 625, 706 and Various Derivatives Jun 17-20, 2001 >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：茵高镍718中氧增强裂纹增长的力学考虑

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摘要

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：进行了一项多学科的协调研究，以阐明高温下Inconel 718中氧增强裂纹扩展的机理。在873至973 K的高纯氩气和氧气中进行了持续载荷测试，以表征裂纹扩展的动力学。通过X射线光电子能谱（XPS）测定了Nb，NbC和Ni_3Nb与氧的反应性。中断在973 K的氧气中进行的裂纹扩展实验，并在样品中充入氢气并在UHV中破碎，以确定各种元素的氧化状态，尤其是在裂纹尖端之前。先前已通过在较低的温度和应力强度水平下将类似合金的间断试样重新装填到氩气中来证明裂纹尖端之前存在损坏区域。提出并讨论了Inconel 718中氧增强裂纹扩展的机理，该机理基于晶界和富Nb碳化物的氧化在裂纹尖端之前形成了脆性的氧化铌膜。

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