Void coalescence and ductile failure in IN718 investigated via high-energy synchrotron X-ray tomography and diffraction
Abstract
Ductile failure through the growth and coalescence of voids is of particular relevance for many engineering materials. Yet, the lack of experimental measurements of the mechanical state of the material at an appropriate length scale has limited further understanding of the regime of ductile failure. In this study, local grain-scale experimental measurements are used to determine their relevance for describing and predicting ductile failure. Additive manufactured materials, due to the presence of inherent porosity, as well as the ability to tailor internal porosity, provides a promising avenue to study ductile failure. Selective laser melting is used to manufacture a specially designed specimen with two large, internal voids, in addition to the natural porosity, which is characteristic to the production process. The initial porosity and its evolution upon tensile loading are characterized via micro tomography. Several locations of void coalescence are captured in the sample, revealing activity of multiple modes of failure. Finite element simulations, with a simplified J2 plasticity model, instantiated with the initial void structure, is deployed, in which geometric localizations of stress concentration corresponded with experimentally observed sites of coalescence but was inadequate in capturing the appropriate failure mechanism. Furthermore, from the experimental results of the far-field high-energymore »
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA)
- OSTI Identifier:
- 1776634
- Grant/Contract Number:
- AC02-06CH11357; N66001-14-1-404
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Mechanics and Physics of Solids
- Additional Journal Information:
- Journal Volume: 145; Journal ID: ISSN 0022-5096
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Additive manufacturing; Defects; High-energy X-ray diffraction microscopy; Microstructure; Tomography
Citation Formats
Naragani, Diwakar P., Park, Jun-Sang, Kenesei, Peter, and Sangid, Michael D. Void coalescence and ductile failure in IN718 investigated via high-energy synchrotron X-ray tomography and diffraction. United States: N. p., 2020.
Web. doi:10.1016/j.jmps.2020.104155.
Naragani, Diwakar P., Park, Jun-Sang, Kenesei, Peter, & Sangid, Michael D. Void coalescence and ductile failure in IN718 investigated via high-energy synchrotron X-ray tomography and diffraction. United States. https://doi.org/10.1016/j.jmps.2020.104155
Naragani, Diwakar P., Park, Jun-Sang, Kenesei, Peter, and Sangid, Michael D. Fri .
"Void coalescence and ductile failure in IN718 investigated via high-energy synchrotron X-ray tomography and diffraction". United States. https://doi.org/10.1016/j.jmps.2020.104155. https://www.osti.gov/servlets/purl/1776634.
@article{osti_1776634,
title = {Void coalescence and ductile failure in IN718 investigated via high-energy synchrotron X-ray tomography and diffraction},
author = {Naragani, Diwakar P. and Park, Jun-Sang and Kenesei, Peter and Sangid, Michael D.},
abstractNote = {Ductile failure through the growth and coalescence of voids is of particular relevance for many engineering materials. Yet, the lack of experimental measurements of the mechanical state of the material at an appropriate length scale has limited further understanding of the regime of ductile failure. In this study, local grain-scale experimental measurements are used to determine their relevance for describing and predicting ductile failure. Additive manufactured materials, due to the presence of inherent porosity, as well as the ability to tailor internal porosity, provides a promising avenue to study ductile failure. Selective laser melting is used to manufacture a specially designed specimen with two large, internal voids, in addition to the natural porosity, which is characteristic to the production process. The initial porosity and its evolution upon tensile loading are characterized via micro tomography. Several locations of void coalescence are captured in the sample, revealing activity of multiple modes of failure. Finite element simulations, with a simplified J2 plasticity model, instantiated with the initial void structure, is deployed, in which geometric localizations of stress concentration corresponded with experimentally observed sites of coalescence but was inadequate in capturing the appropriate failure mechanism. Furthermore, from the experimental results of the far-field high-energy diffraction microscopy, the heterogeneous micromechanical state is identified and tracked around voids due to the local grain interactions. These experiments determine narrow bands of low stress triaxiality, at the onset of failure, which highlight the path of coalescence through intervoid shearing. Diffraction spot spreading analysis aided characterization of intragranular plasticity and strain heterogeneity, which can be coupled with high triaxiality to form the conditions inducive for coalescence through intervoid necking. In this study, the experimentally determined grain-scale description of the micromechanical state provides a physical basis that can accurately capture both the sites and the mechanism of void coalescence at the onset of ductile failure.},
doi = {10.1016/j.jmps.2020.104155},
journal = {Journal of the Mechanics and Physics of Solids},
number = ,
volume = 145,
place = {United States},
year = {Fri Sep 18 00:00:00 EDT 2020},
month = {Fri Sep 18 00:00:00 EDT 2020}
}
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