Microstructural Characteristics, Mechanical Properties, and Corrosion Behavior of Field-Assisted Diffusion Welded Alloy 617

Zhang, Xinchang [Idaho National Laboratory]; McMurtrey, Michael D [Idaho National Laboratory] (ORCID:0000000278352888); Patterson, Tate [Idaho National Laboratory] (ORCID:0000000347279419); Yang, Qiufeng [Idaho National Laboratory]; Gakhar, Ruchi [Idaho National Laboratory] (ORCID:0000000228293533); Rufner, Jorgen Fredrick [Idaho National Laboratory] (ORCID:000000017296961X)

DOE OSTI · 3028350

Microstructural Characteristics, Mechanical Properties, and Corrosion Behavior of Field-Assisted Diffusion Welded Alloy 617

Zhang, Xinchang [Idaho National Laboratory]·McMurtrey, Michael D [Idaho National Laboratory] (ORCID:0000000278352888)·Patterson, Tate [Idaho National Laboratory] (ORCID:0000000347279419)·Yang, Qiufeng [Idaho National Laboratory]·Gakhar, Ruchi [Idaho National Laboratory] (ORCID:0000000228293533)·Rufner, Jorgen Fredrick [Idaho National Laboratory] (ORCID:000000017296961X)

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Abstract

This study investigated the microstructural characteristics, mechanical response, and corrosion resistance of Alloy 617 diffusion welded by electric field-assisted sintering (EFAS). The microstructure exhibited good grain boundary (GB) migration across the interface and flat interface in the samples bonded at different conditions. Graded grain size was observed, with grain coarsening being more significant near sample surface due to EFAS-induced temperature gradient. Tensile testing revealed that the specimens fractured in the matrix away from the interface. The peak strength of 807 MPa was obtained in the samples welded at 1000°C. The materials obtained at 1100°C exhibited reduced tensile strength but improved ductility. Strain maps revealed by digital image correlation showed the flat interfaces were less ductile compared to the matrix. The hardness reduced near sample surfaces due to enlarged grains induced by temperature gradient. The interfaces with GB migration exhibited improved corrosion resistance in molten salt compared to the flat interfaces.

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36 - MATERIALS SCIENCE Alloy 617 Compact heat exchanger Diffusion welding Mechanical properties

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Zhang, Xinchang [Idaho National Laboratory], McMurtrey, Michael D [Idaho National Laboratory] (ORCID:0000000278352888), Patterson, Tate [Idaho National Laboratory] (ORCID:0000000347279419), Yang, Qiufeng [Idaho National Laboratory], Gakhar, Ruchi [Idaho National Laboratory] (ORCID:0000000228293533), Rufner, Jorgen Fredrick [Idaho National Laboratory] (ORCID:000000017296961X). 2025-03-24. Microstructural Characteristics, Mechanical Properties, and Corrosion Behavior of Field-Assisted Diffusion Welded Alloy 617. https://www.osti.gov/biblio/3028350

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