期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 349, 期 1-2, 页码 213-217出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(02)00753-0
关键词
oxygen-induced cracking; dynamic embrittlement; grain-boundary engineering; IN718
Polycrystalline Ni-base superalloys are prone to time-dependent intergranular failure when the loading temperatures exceeds about 873 K. The fracture process is then controlled by oxygen grain-boundary diffusion followed by decohesion of the respective boundaries. It is shown that this kind of cracking for IN718 at 923 K in air can be reduced significantly by successive steps of deformation and annealing, which is known as grain-boundary-engineering processing. This illustrates the importance of the grain-boundary-character distribution with regard to this mode of failure, which is known as 'dynamic embrittlement.' (C) 2002 Elsevier Science B.V. All rights reserved.
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