Mechanical Properties of Inconel 718 Nickel-Based Superalloy around Solidus Temperature

Abstract

Nickel based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE(Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid liquid coexistence. In this study, we try to get high temperature (around solidus temperature) mechanical properties of the nickel based superalloy such as Inconel 718 by using originally developed tensile test. In the previous reports, flat distribution of temperature in the gage length, and crack initiation strain were not ensured. On the other, the developed device ensured within 3°C of the temperature distribution in the gage length as to the Inconel 718. Tensile strain was measured by using in situ observation of marker on the surface of the specimen. As a result, Stress Strain curve, crack initiation stress, and crack initiation strain of Inconel 718 were obtained.

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“…Nickel-based superalloys also have super high strength at high temperatures (Ohashi et al, 2012), which are typically difficult to be processed (Lu et al, 2019), and have been widely used in aerospace and petroleum industries. The material contains Mo, Ti, Ni, Nb, Cr, and other elements with stable atomic structure, which has a high melting point and high activation energy, resulting in poor relative machinability (Attanasio et al, 2020).…”