Evaluation of Yield Strength Anomaly of Alloy 718 at 700-800°C

Authors

Ajit K. Roy, University of Nevada, Las VegasFollow
Anand Venkatesh, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

4-2010

Publication Title

Journal of Alloys and Compounds

Volume

496

Issue

1-2

First page number:

393

Last page number:

398

Abstract

Alloy 718 showed enhanced tensile yield strength and reduced ductility at 700 and 800 °C, a possible indication of yield strength anomaly phenomenon. The results of TEM, STEM and EDS verified the formation and precipitation of γ′′ and δ phases at these temperatures that could have contributed to such anomalous behavior of this alloy under tensile loading. Presence of nickel (Ni) and niobium (Nb) was observed in both phases, suggesting a composition of Ni₃Nb for them.

Keywords

Dislocations; Dislocations in metals; Heat resistant alloys; High-temperature alloys; Loads (Mechanics); Nickel alloys; Niobium alloys; Phase transitions; Strength of materials; Transmission electron microscopy

Disciplines

Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy

Language

English

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

Repository Citation

Roy, A. K., Venkatesh, A. (2010). Evaluation of Yield Strength Anomaly of Alloy 718 at 700-800°C. Journal of Alloys and Compounds, 496(1-2), 393-398.