Spark plasma sintering of Inconel 738LC: densification and microstructural characteristics

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Publication Details

Contributor list: Ogunbiyi OF, Sadiku ER, Jamiru T, Adesina OT, Beneke LW

Publisher: IOP PUBLISHING LTD

Place: BRISTOL

Publication year: 2019

Journal: Materials Research Express (ISSN:2053-1591) (eISSN:2053-1591) PubCount Year: 2019, 2020

Journal acronym: MATER RES EXPRESS

Volume number: 6

Issue number: 10

ISSN: 2053-1591

eISSN: 2053-1591

Languages: English-Great Britain (EN-GB)


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Abstract

The optimization of sintering temperature in the production of nickel-based superalloy was investigated. Mixed elemental powders of Inconel 738LC superalloy was fabricated at different sintering temperature ranging between 900 and 1200 degrees C, with a heating rate of 100 degrees C min(-1), pressure of 50 MPa and 5 min holding time. The microstructures, phase analyses, densification and microhardness tests were conducted by using scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), x-ray Diffraction (XRD), polarized optical microscope (POM), micro-hardness testing machine, and Archimedes' method respectively. Results revealed the formation of intermetallic phases in the microstructure, irrespective of the sintering temperature. The relative density increased with increasing sintering temperature, as the highest relative density of 98.4% was attained at 1200 degrees C and with a corresponding microhardness value of 362.25 Hv. There was a marginal decrease in grain size with increasing temperature, thereby resulted in reduced grain growth. This implies that the SPS technology is appropriate for the fabrication of nickel-based superalloy.


Keywords

densification, IN738LC, microstructure, Spark plasma sintering


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Last updated on 2020-31-01 at 10:35