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Title: Homogenization kinetics of a nickel-based superalloy produced by powder bed fusion laser sintering

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1415242
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 131; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-30 04:14:08; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Fan, Levine, Lyle E., Allen, Andrew J., Campbell, Carelyn E., Lass, Eric A., Cheruvathur, Sudha, Stoudt, Mark R., Williams, Maureen E., and Idell, Yaakov. Homogenization kinetics of a nickel-based superalloy produced by powder bed fusion laser sintering. United States: N. p., 2017. Web. doi:10.1016/j.scriptamat.2016.12.037.
Zhang, Fan, Levine, Lyle E., Allen, Andrew J., Campbell, Carelyn E., Lass, Eric A., Cheruvathur, Sudha, Stoudt, Mark R., Williams, Maureen E., & Idell, Yaakov. Homogenization kinetics of a nickel-based superalloy produced by powder bed fusion laser sintering. United States. doi:10.1016/j.scriptamat.2016.12.037.
Zhang, Fan, Levine, Lyle E., Allen, Andrew J., Campbell, Carelyn E., Lass, Eric A., Cheruvathur, Sudha, Stoudt, Mark R., Williams, Maureen E., and Idell, Yaakov. Sat . "Homogenization kinetics of a nickel-based superalloy produced by powder bed fusion laser sintering". United States. doi:10.1016/j.scriptamat.2016.12.037.
@article{osti_1415242,
title = {Homogenization kinetics of a nickel-based superalloy produced by powder bed fusion laser sintering},
author = {Zhang, Fan and Levine, Lyle E. and Allen, Andrew J. and Campbell, Carelyn E. and Lass, Eric A. and Cheruvathur, Sudha and Stoudt, Mark R. and Williams, Maureen E. and Idell, Yaakov},
abstractNote = {},
doi = {10.1016/j.scriptamat.2016.12.037},
journal = {Scripta Materialia},
number = C,
volume = 131,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.scriptamat.2016.12.037

Citation Metrics:
Cited by: 6works
Citation information provided by
Web of Science

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  • Additively manufactured (AM) metal components often exhibit fine dendritic microstructures and elemental segregation due to the initial rapid solidification and subsequent melting and cooling during the build process, which without homogenization would adversely affect materials performance. In this letter, we report in situ observation of the homogenization kinetics of an AM nickel-based superalloy using synchrotron small angle X-ray scattering. The identified kinetic time scale is in good agreement with thermodynamic diffusion simulation predictions using microstructural dimensions acquired by ex situ scanning electron microscopy. These findings could serve as a recipe for predicting, observing, and validating homogenization treatments in AM materials.
  • Additive manufacturing (AM) has the potential to revolutionize discrete part manufacturing, but improvements in processing of metallic materials are necessary before AM will see widespread adoption. A better understanding of AM processes, resulting from physics-based modeling as well as direct process metrology, will form the basis for these improvements. Infrared (IR) thermography of AM processes can provide direct process metrology, as well as data necessary for the verification of physics-based models. We review selected works examining how IR thermography was implemented and used in various powder-bed AM processes. This previous work, as well as significant experience at the National Institutemore » of Standards and Technology in temperature measurement and IR thermography for machining processes, shapes our own research in AM process metrology with IR thermography. We discuss our experimental design, as well as plans for future IR measurements of a laser-based powder bed fusion AM process.« less
  • Here, Laser Powder-Bed Fusion (L-PBF) metal-based additive manufacturing (AM) is complex and not fully understood. Successful processing for one material, might not necessarily apply to a different material. This paper describes a workflow process that aims at creating a material data sheet standard that describes regimes where the process can be expected to be robust. The procedure consists of building a Gaussian process-based surrogate model of the L-PBF process that predicts melt pool depth in single-track experiments given a laser power, scan speed, and laser beam size combination. The predictions are then mapped onto a power versus scan speed diagrammore » delimiting the conduction from the keyhole melting controlled regimes. This statistical framework is shown to be robust even for cases where experimental training data might be suboptimal in quality, if appropriate physics-based filters are applied. Additionally, it is demonstrated that a high-fidelity simulation model of L-PBF can equally be successfully used for building a surrogate model, which is beneficial since simulations are getting more efficient and are more practical to study the response of different materials, than to re-tool an AM machine for new material powder.« less
  • An investigation was carried out to determine the growth kinetics of [gamma][prime] precipitates in a newly developed single-crystal nickel-base superalloy containing rhenium (CMSX-4G). The investigation also examined the influence of [gamma][prime] precipitates (size and distribution) on fatigue crack growth behavior of the material in a room-temperature ambient atmosphere. The influence of load ratio on fatigue threshold of the material and crack growth mechanisms in fatigue was also studied. Compact tension specimens were prepared from a single-crystal nickel-base superalloy, CMSX-4G, with the <001> crystallographic direction. These specimens were given two different heat treatments to produce two different [gamma][prime] size precipitates. Fatiguemore » crack growth behavior of these materials was studied at three different load ratios (R = 0.10, 0.50, and 0.90) in room-temperature ambient atmosphere. The results of the present investigation demonstrate that rhenium additions in CMSX-4G substantially lowers the [gamma][prime] coarsening kinetics of this alloy. The smaller [gamma][prime] precipitate size was found to be beneficial for fatigue resistance and has resulted in a higher fatigue threshold and lower fatigue crack growth rate in the threshold region. The fatigue threshold was found to decrease with an increase in load ratio. The crack growth mechanism in the threshold region was found to occur by a combination of microvoid coalescence and striations.« less