Abstract
The shear flow and failure of a superalloy Inconel 625, conceived for jet engine applications, are investigated by using a modified flat gauge shear specimen with the assistance of Digital Image Correlation (DIC). The constant strain rate shear tests were successfully performed by using a screw driven Zwick machine and a bespoke spilt Hopkinson tension bar (SHTB). Nearly all gauge section is in a uniform strain state at dynamic force equilibrium condition. The constitutive relationships and the crystallographic texture show strain rate dependence. Different from the void growth induced failure at quasi-isothermal condition, the Inconel 625 fails by adiabatic shear at high strain rates. The present shear testing provides an opportunity to study the shear flow and failure of superalloy of small structural components in turbine engine.
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