Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

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Inclusions are important phases affecting material properties in complicated ways.In this paper, a quantitative study of click here the addition of HfO2 inclusions to DZ125 nickel-based superalloys was performed.Experimental results showed that the introduction of HfO2 inclusions caused a loss of strength and ductility.The carbide morphology also changed significantly from skeletal-shaped to block-shaped, resulting in a remarkable discrepancy in the fracture behavior under quasi-in-situ tensile testing.The SEM dynamic observations showed that cracks were initiated from the skeletal carbides and almost failed to propagate into the matrix.

In contrast, the damage behavior of block-shaped carbides also involved internal cracking but with a tendency to form interconnected microcracks during propagation.A crystal plasticity finite element model (CPFEM) method was further developed to hobbit door for sale study the stress/strain behavior during the deformation process, considering the crystal orientations and microstructure morphologies from the EBSD data.Those elastoplastic parameters were determined through nanoindentation experiments.Simulation results verified that blocky carbides produced a pronounced strain concentration at the interface of the carbides and matrix, thereby increasing the tendency of crack formation.This paper provides a fundamental understanding of the role of inclusions in material recycling applications.