Nanoscale serration characteristics of additively manufactured superalloys

Rowe, Russell A.; Tajyar, Ali; Munther, Michael; Johanns, Kurt E.; Allison, Paul G.; Momeni, Kasra; Davami, Keivan

doi:10.1016/j.jallcom.2020.156723

Nanoscale serration characteristics of additively manufactured superalloys

Journal Article · Sat Aug 15 04:00:00 EDT 2020 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2020.156723· OSTI ID:1848357

Rowe, Russell A. ^[1]; Tajyar, Ali ^[2]; Munther, Michael ^[2]; Johanns, Kurt E. ^[3]; Allison, Paul G. ^[2]; Momeni, Kasra ^[2]; Davami, Keivan ^[2]

Univ. of Alabama, Tuscaloosa, AL (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
Univ. of Alabama, Tuscaloosa, AL (United States)
KLA Instruments, Oak Ridge, TN (United States)

Structural elements made of nickel-based superalloys usually operate at high temperatures. Many surface failure mechanisms such as creep, fatigue, fretting fatigue, corrosion, and stress corrosion cracking start from the surface. Thus, studying the surface mechanical properties and deformation behavior of materials is vital in order to draw a correlation between the surface properties and failures. Herein, a nanoindentation technique was implemented to characterize surface properties of a widely used additively manufactured (AM) superalloy, i.e., Inconel 625. The specimens were tested in a range of temperatures in a vacuum chamber. Serrated plastic flow characterized by pop-in events during nanoindentation, known as Portevin-Le Chatelier (PLC) effect, was observed in all three tested elevated temperatures. This phenomenon depicts itself as bursts of plasticity in the loading section of the load-displacement curves. These bursts were studied comprehensively to explore incipient plasticity. Hertzian contact mechanics were implemented to extract the maximum shear stress beneath the indenter from the pop-in loads. The results show that the initial pop-in load increases as the temperature increases. The average initial pop-in load increases by almost four times from 300 °C to 650 °C. This was attributed to the formation of strengthening precipitates. The average size of the serrations and the magnitude of dislocation nucleation increase from 300 °C to 500 °C and decrease from 500 °C to 650 °C. Finally, the serrations are attributed to the dislocation generation and movement as well as their interaction with the solute atoms and precipitates.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0001066

OSTI ID:: 1848357

Alternate ID(s):: OSTI ID: 1668431

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 854; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Nanoscale serration characteristics of additively manufactured superalloys

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