Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718
Abstract
In this paper, creep rupture samples were fabricated by additive manufacturing (AM) via electron beam melting (EBM) to study the effects of grain morphology (equiaxed/columnar grains) and loading direction (longitudinal/transverse) with respect to build direction on creep deformation at 923 K (650 °C) with applied stresses of 580 and 600 MPa. The observed minimum creep rates and creep rupture lives of EBM Inconel 718 after post-processing by hot isostatic pressing (HIP) were found to be comparable to wrought material. The material with equiaxed grains exhibited low creep strain (2 pct) and short creep lifetimes (800 hours), whereas longer times (approximately 4500 hours) and high creep strain (up to 23 pct) were observed for material with columnar grains. The high stress exponent (n > 14) reflected the resistance to dislocation motion by γ” particles during creep. A precipitate-free zone (PFZ) was observed around the grain boundary δ phase. Creep damage occurred as voids and cracks in the PFZ. Finally, optimal post-processing of EBM Inconel 718 material should be explored to prevent δ phase embrittlement.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and 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 and Technology Division. Manufacturing Demonstration Facility
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
- OSTI Identifier:
- 1474675
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
- Additional Journal Information:
- Journal Volume: 49; Journal Issue: 10; Journal ID: ISSN 1073-5623
- Publisher:
- ASM International
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 42 ENGINEERING
Citation Formats
Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, and Dehoff, Ryan. Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718. United States: N. p., 2018.
Web. doi:10.1007/s11661-018-4812-z.
Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, & Dehoff, Ryan. Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718. United States. https://doi.org/10.1007/s11661-018-4812-z
Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, and Dehoff, Ryan. Mon .
"Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718". United States. https://doi.org/10.1007/s11661-018-4812-z. https://www.osti.gov/servlets/purl/1474675.
@article{osti_1474675,
title = {Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718},
author = {Shassere, Benjamin and Greeley, Duncan and Okello, Alfred and Kirka, Michael and Nandwana, Peeyush and Dehoff, Ryan},
abstractNote = {In this paper, creep rupture samples were fabricated by additive manufacturing (AM) via electron beam melting (EBM) to study the effects of grain morphology (equiaxed/columnar grains) and loading direction (longitudinal/transverse) with respect to build direction on creep deformation at 923 K (650 °C) with applied stresses of 580 and 600 MPa. The observed minimum creep rates and creep rupture lives of EBM Inconel 718 after post-processing by hot isostatic pressing (HIP) were found to be comparable to wrought material. The material with equiaxed grains exhibited low creep strain (2 pct) and short creep lifetimes (800 hours), whereas longer times (approximately 4500 hours) and high creep strain (up to 23 pct) were observed for material with columnar grains. The high stress exponent (n > 14) reflected the resistance to dislocation motion by γ” particles during creep. A precipitate-free zone (PFZ) was observed around the grain boundary δ phase. Creep damage occurred as voids and cracks in the PFZ. Finally, optimal post-processing of EBM Inconel 718 material should be explored to prevent δ phase embrittlement.},
doi = {10.1007/s11661-018-4812-z},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 10,
volume = 49,
place = {United States},
year = {Mon Jul 16 00:00:00 EDT 2018},
month = {Mon Jul 16 00:00:00 EDT 2018}
}
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