Comparative Thermal Aging Effects on PM-HIP and Forged Inconel 690

Alexander L. Bullens, Esteban Bautista, Elizabeth H. Jaye, Nathaniel L. Vas, Nathan B. Cain, Keyou Mao, David W. Gandy, Janelle P. Wharry

Research output: Contribution to journalArticlepeer-review

Abstract

This study compares thermal aging effects in Inconel 690 (IN690) produced by forging and powder metallurgy with hot isostatic pressing (PM-HIP). Isothermal aging is carried out over 400–800°C for up to 1000 h and then metallography and nanoindentation are utilized to relate grain microstructure with hardness and yield strength. The PM-HIP IN690 maintains a constant grain size through all aging conditions, while the forged IN690 exhibits limited grain growth at the highest aging temperature and longest aging time. The PM-HIP IN690 exhibits comparable mechanical integrity as the forged material throughout aging: hardness and yield strength are unchanged with 100 h aging, but increase after 1000 h aging at all temperatures. In both the PM-HIP and forged IN690, the Hall–Petch relationship for Ni-based superalloys predicts yield strength for 0–100 h aged specimens, but underestimates yield strength in the 1000 h aged specimens because of thermally induced precipitation.

Original languageEnglish (US)
Pages (from-to)2218-2223
Number of pages6
JournalJOM
Volume70
Issue number10
DOIs
StatePublished - Oct 1 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering

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