| Abstract Scope |
In this study, the conversion of plastic work to heat, also known as the Taylor-Quinney coefficient (β), of Inconel 718 (IN718) is investigated. Three material conditions are examined, specifically wrought IN718, additively manufactured (AM) IN718 in the as-built condition, and AM IN718 that has been recrystallized through a solutionizing heat treatment. Adiabatic deformation is achieved using a tension split-Hopkinson pressure bar. During deformation IR thermography measurements are captured to assess β as a function of strain. Electron backscatter diffraction was utilized to measure grain size, morphology, and texture. It was observed that wrought IN718 had the lowest conversion of plastic work to heat (β = 0.2). The as-built as-built IN718 had an intermediate conversion (β = 0.3), and the recrystallized condition had the greatest conversion efficiency (β = 0.45). The observed magnitudes of β are discussed in light of the microstructural similarities and differences of each material condition. |