The Proceedings of the Materials and Mechanics Conference
Online ISSN : 2424-2845
2014
Session ID : OS2111
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OS2111 Experimental investigation on the Stage I fatigue crack propagation in Ni-base superalloys
Motoki SAKAGUCHIDaichi KOHYAMAToshiyuki KIMURAHirotsugu INOUE
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract
Stage I fatigue crack propagation in thin-wall superalloys were experimentally investigated at room temperature, employing miniature compact tension (CT) specimens directly extracted from as-cast Ni-base superalloys. At first, the effect of crystallographic orientation on the fatigue crack propagation was investigated, using a single crystal (SC) Ni-base superalloy, NKH-304, with different primary orientations. Based on the test result of the SC specimens, some significant interactions between the crack and grain boundaries were discussed, using a directionally solidified (DS) superalloy, Mar-M247. It was found from a series of experiments that the Stage I fatigue crack propagation rate in both SC and DS superalloys were significantly affected by the primary crystallographic orientation and the vicinity of the grain boundaries.
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© 2014 The Japan Society of Mechanical Engineers
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