The effect of grain-boundary-engineering-type processing on oxygen-induced cracking of IN718
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- 作者：Krupp ; Ulrich ; Kane ; William M. ; Liu ; Xinyu ; Dueber ; Olaf ; Laird ; Campbell ; McMahon Jr ; Charles J.
- 关键词：Oxygen-induced cracking ; Dynamic embrittlement ; Grain-boundary engineering ; IN718
- 刊名：Materials Science and Engineering: A
- 出版年：2003
- 出版时间：May 25, 2003
- 年：2003
- 卷：349
- 期：1-2
- 页码：213-217
- 全文大小：303 K
文摘
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.’