Microstructural investigation of thermally aged nickel-­based superalloy 718Plus

Lawrence Whitmore*, Mohammad Reza Ahmadi, Martin Stockinger, Erwin Povoden-Karadeniz, Ernst Kozeschnik, Harald Leitner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of thermal aging upon the nickel-based 718Plus superalloy are investigated and modelled. Yield strength and micro-hardness measurements are made after solution annealing and after aging at 788 °C for 4 h. In order to explain the differences in strength and hardness, a detailed investigation of the microstructure is performed using transmission electron microscopy. The size and phase fraction of the γ′ precipitates are measured and related to the measured hardness and yield strength using a theoretical model of precipitation strengthening based on the shearing of precipitates in terms of coherency strengthening and the formation of an antiphase boundary.
Original languageEnglish
Pages (from-to)253-259
JournalMaterials Science and Engineering A
Volume594
DOIs
Publication statusPublished - 2014

Fields of Expertise

  • Advanced Materials Science

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