Cavitation and failure in a fine-grained Inconel 718 alloy having potential superplastic properties

Huang, Yi and Langdon, Terence G. (2005) Cavitation and failure in a fine-grained Inconel 718 alloy having potential superplastic properties. Materials Science and Engineering: A, 410-411, 130-133. (doi:10.1016/j.msea.2005.08.095).


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Experiments were conducted to evaluate the failure behavior and the cavitation characteristics of an Inconel 718 alloy with a potential for superplastic forming. Tensile testing was performed on the as-received alloy at a temperature of 950 °C and using initial strain rates from 10?4 to 10?2 s?1. All specimens were pulled to failure and then examined using optical microscopy and a quantitative image analysis facility. The results show evidence for extensive necking at a strain rate of 10?2 s?1 but there is less necking and more internal cavitation at the lowest strain rate of 10?4 s?1. Quantitative measurements of internal cavitation show the area fraction of cavities and the average cavity area both increase with increasing strain and with decreasing strain rate. It is concluded that the cavities grow initially by diffusion but there is an important additional contribution from cavity interlinkage.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.msea.2005.08.095
Additional Information: The Langdon Symposium: Flow and forming of Crystalline Materials
ISSNs: 0921-5093 (print)
Keywords: cavitation, failure, necking, superalloys, superplasticity
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TN Mining engineering. Metallurgy
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 23824
Accepted Date and Publication Date:
Date Deposited: 21 Mar 2006
Last Modified: 31 Mar 2016 11:44

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