Progress of Cryogenics and Isotopes Separation

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The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.

STUDY OF INCONEL 718 ALLOY TESTED BY HEAT-CYCLING Print

STUDY OF INCONEL 718 ALLOY TESTED BY HEAT-CYCLING


Velciu Lucian*, Meleg Tiberiu, Panţîru Marian, Daniel Petrescu, Florea Voicu


RATEN - Institute for Nuclear Research Pitesti, Romania, 1 Campului Str. Mioveni 115400


abstract

 

This paper investigated Inconel 718 (UNS N07718) alloy after some heat-cycling tests. The study continues prior tests realized in INR Piteşti concerning utilization of some nickel-based alloys in the heat-exchangers and steam-generators construction of future Nuclear Plants. Technical parameters of thermal cycling: 50 & 200 cycles, 25 C˚/minute heating-cooling rate, 450-1000°C temperature range. The analysis consisted in metallographic examination (microstructure), Vickers microhardness (MHV0.1) and traction tests. The samples were investigated by Olympus GX 71 optical microscope, OPL tester in automatic cycle and Walter Bai traction machine. The average grain size (G) was determined by linear interception method (ASTM E-112). The micro hardness was calculated by the relationship of the device technical book. The Strength-Deformation diagrams furnish data of mechanical properties: tensile strength (Rm) and elongation (A). The tested alloy was compared with the „as received” material, and the results showed a good metallographic and mechanical behaviour of the alloy after these thermal-cycling tests.

Keywords: Inconel 718, heat-cycling, microstructure, microhardness, tensile strength.

 


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*Corresponding author: Lucian Velciu, E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it