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

Autor: Bullens AL; School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA., Bautista E; Department of Chemistry and Biochemistry, California State University - Northridge, 18111 Nordhoff Street, Northridge, CA 91330, USA., Jaye EH; School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA., Vas NL; School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA., Cain NB; School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, IN 47907, USA., Mao K; School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, IN 47907, USA., Gandy DW; Electric Power Research Institute, 1300 West WT Harris Boulevard, Charlotte, NC 28262, USA., Wharry JP; School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN 47907, USA.
Jazyk: angličtina
Zdroj: JOM (Warrendale, Pa. : 1989) [JOM (1989)] 2018 Oct; Vol. 70 (10), pp. 2218-2223. Date of Electronic Publication: 2018 Mar 19.
DOI: 10.1007/s11837-018-2818-z
Abstrakt: 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 super-alloys predicts yield strength for 0-100 h aged specimens, but underestimates yield strength in the 1000 h aged specimens because of thermally induced precipitation.
Databáze: MEDLINE
Externí odkaz: