Analysis and constitutive modeling of dynamic impact behaviour of Haynes 282 superalloy
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Date
2018-09-11
Authors
Ugodilinwa, Nnaemeka
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Abstract
Haynes 282 is a nickel-based superalloy used in the static and rotating components of aerospace engines. Several studies have reported on its mechanical properties; however, little information is available on its impact behaviour which is critical in determining its resistance to damage under high strain rate loading. This study investigates the dynamic impact behaviour of Haynes 282 at strain rates of up to 9 x 103 s-1 and temperatures from 25oC to 800oC. The experimental results show that the flow stress of Haynes 282 is less sensitive to strain rate, a remarkable feature that could ease the machinability of this new alloy. Haynes 282 is more susceptible to impact failure after ageing due to its higher strength and lower strain hardening capability that predisposes it to the formation of adiabatic shear bands. Furthermore, an Arrhenius-type constitutive model is used to predict the dynamic impact behaviour of Haynes 282.
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Keywords
Haynes 282, High Strain Rate, Adiabatic Shear Band, Constitutive Model, Superalloy