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2018 | OriginalPaper | Buchkapitel

The Effect of Grain Size on the Dwell Fatigue Crack Growth Rate of Alloy ATI 718Plus®

verfasst von : Minqing Wang, Jinhui Du, Qun Deng, Xudong Lv, Chengbin Yang, Jianxin Dong

Erschienen in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Verlag: Springer International Publishing

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Abstract

Grain size optimization is an important method to improve the fatigue crack growth resistance of superalloys. For ATI 718Plus^® alloy, the effect of grain size on the fatigue crack growth rate (FCGR) is more complex, because of the complex effects of η-Ni₃Al_0.5Nb_0.5 precipitated at the grain boundaries. In the past, the fine-grain ATI 718Plus^® alloy was found to exhibit better dwell fatigue crack growth rate (DFCGR) resistance than that of the coarse-grain alloy at high temperature. An attempt to explain this phenomenon was based on the grain boundary oxygen diffusion/oxidation viewpoint; however, the mechanism remained unclear until now. Based on this, we investigated the relationship between the grain size and the DFCGR of ATI 718Plus^® alloy. The DFCGR of ATI 718Plus^® alloys with different grain sizes were tested in air at 704 °C. Furthermore, the microstructures and crack growth paths were analyzed, and the plastic zone near the crack tip was calculated for specimens with different grain sizes. The better effect fine grain ATI 718Plus^® has on DFCGR is related to more η-Ni₃Al_0.5Nb_0.5 phase precipitation and reduced oxygen diffusion along grain boundaries, as well as the reduction of the plastic zone near the crack tip and the increase in secondary cracking with decreasing grain size.

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Titel: The Effect of Grain Size on the Dwell Fatigue Crack Growth Rate of Alloy ATI 718Plus®
verfasst von: Minqing Wang
Jinhui Du
Qun Deng
Xudong Lv
Chengbin Yang
Jianxin Dong
Verlag: Springer International Publishing
Buch: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications
Print ISBN: 978-3-319-89479-9

Electronic ISBN: 978-3-319-89480-5

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-89480-5_55

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