Effect of anisotropy and texture on the low cycle fatigue behavior of Inconel 718 processed via electron beam melting

Kirka, Michael M.; Greeley, Duncan A.; Hawkins, Charles S.; Dehoff, Ryan R.

doi:10.1016/j.ijfatigue.2017.08.021

Title: Effect of anisotropy and texture on the low cycle fatigue behavior of Inconel 718 processed via electron beam melting

Journal Article · 11 September 2017 · International Journal of Fatigue

DOI: https://doi.org/10.1016/j.ijfatigue.2017.08.021 · OSTI ID:1423081

Kirka, Michael M. ^[1]; Greeley, Duncan A. ^[2]; Hawkins, Charles S. ^[3]; Dehoff, Ryan R. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Here in this study, the impact of texture (columnar/equiax grain structure) and influence of material orientation on the low cycle fatigue (LCF) behavior of hot isostatic pressed (HIP) and heat-treated Inconel 718 fabricated through electron beam melting (EBM) is investigated. Material was tested both parallel and perpendicular (transverse) to the build direction. In all instances, the EBM HIP and heat-treated Inconel 718 performed similarly or exceeded the LCF life of wrought Inconel 718 plate and bar stock under fully reversed strain-controlled loading at 650 °C. Amongst the textures, the columnar grains oriented parallel to the build direction exhibited the highest life on average compared to the transverse columnar and equiax EBM material. Further, in relation to the reference wrought material the parallel columnar grain material exhibited a greater life. While a negligible life difference was observed in the equiax grained material between the two orientations, a consistently lower accumulated inelastic strain was measured for the material loaded parallel to the build direction than the transverse orientation. Failure of the parallel columnar material occurred in a transgranular manner with cracks emanating from the surface whereas the transverse columnar material failed in a intergranular manner, with crack growth occurring through repeated rupture of oxide at the crack-tip. Finally, in the case of the equiax material, an influence of material orientation was not observed on the failure mechanism with crack propagation occurring through a combination of debonded/cracked carbides and void formation along twin boundaries resulting in a mixture of intergranular and transgranular crack propagation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1423081

Alternate ID(s):: OSTI ID: 1495616

Journal Information:: International Journal of Fatigue, Vol. 105; ISSN 0142-1123

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Notched fatigue testing of Inconel 718 prepared by selective laser melting Witkin, D. B.; Patel, D. N.; Bean, G. E. Fatigue & Fracture of Engineering Materials & Structures, Vol. 42, Issue 1 https://doi.org/10.1111/ffe.12880	journal	July 2018
Can Appropriate Thermal Post-Treatment Make Defect Content in as-Built Electron Beam Additively Manufactured Alloy 718 Irrelevant? Goel, Sneha; Bourreau, Kévin; Olsson, Jonas Materials, Vol. 13, Issue 3 https://doi.org/10.3390/ma13030536	journal	January 2020
High cycle fatigue life estimation of materials processed by laser powder bed fusion Hovig, Even W.; Azar, Amin S.; Sunding, Martin F. Fatigue & Fracture of Engineering Materials & Structures, Vol. 42, Issue 7 https://doi.org/10.1111/ffe.12982	journal	February 2019
Determination of Anisotropic Mechanical Properties for Materials Processed by Laser Powder Bed Fusion Hovig, Even W.; Azar, Amin S.; Grytten, Frode Advances in Materials Science and Engineering, Vol. 2018 https://doi.org/10.1155/2018/7650303	journal	November 2018
Effect of Different Post-treatments on the Microstructure of EBM-Built Alloy 718 Goel, Sneha; Ahlfors, Magnus; Bahbou, Fouzi Journal of Materials Engineering and Performance, Vol. 28, Issue 2 https://doi.org/10.1007/s11665-018-3712-0	journal	October 2018
Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel Günther, J.; Lehnert, R.; Wagner, R. JOM, Vol. 72, Issue 3 https://doi.org/10.1007/s11837-020-04018-6	journal	January 2020
Progress in the Processing and Understanding of Alloy 718 Fabricated Through Powder Bed Additive Manufacturing Processes Kirka, Michael M.; Plotkowski, Alex; Nandwana, Peeyush The Minerals, Metals & Materials Series https://doi.org/10.1007/978-3-319-89480-5_4	book	January 2018
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The Effect of Location and Post-treatment on the Microstructure of EBM-Built Alloy 718 Goel, Sneha; Olsson, Jonas; Ahlfors, Magnus The Minerals, Metals & Materials Series https://doi.org/10.1007/978-3-319-89480-5_6	book	January 2018
Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel Günther, Johannes; Lehnert, Robert; Wagner, Ruben Universität Kassel https://doi.org/10.17170/kobra-202005041208	text	January 2020
Additive Manufacturing of Alloy 718 via Electron Beam Melting: Effect of Post-Treatment on the Microstructure and the Mechanical Properties Balachandramurthi, Arun; Moverare, Johan; Mahade, Satyapal Materials, Vol. 12, Issue 1 https://doi.org/10.3390/ma12010068	journal	December 2018

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