EPRI EF Nuclear Power Plant Materials Certification Exam 2023

EPRI EF Nuclear Power Plant Materials Certification Exam 2023 Brittleness - ANSWER-The opposite of ductility. Brittle metals exhibit a small percentage of elongation under stress before failure. Cold Shut - ANSWER-A defect produced during casting, causing an area in the metal where two portions of the metal in either a molten or plastic condition have come together but have failed to unite, fuse, or blend into a solid mass. Conductivity - ANSWER-The property of conducting heat or electric current. Crack lamination - ANSWER-A defect appearing in sheets or strips as a segregation or in layers. Degradation - ANSWER-Damage caused over time to components and materials caused by a range of physical processes, resulting in component failure. Ductility - ANSWER-The ability of a material to deform easily upon the application of a tensile force, or the ability of a material to withstand plastic deformation without rupture. in other words, ductility is the ability of a material to undergo plastic deformation prior to fracture. Elasticity - ANSWER-In elastic strain, bonds are stretched but not broken. Therefore, the material will return to its original shape when stresses are removed. The applied stresses cause the atoms in a crystal to move from their equilibrium position. All the atoms are displaced the same amount and still maintain their relative geometry. When the stresses are removed, all the atoms return to their original positions and no permanent deformation occurs. Exothermic - ANSWER-Releases energy, i.e.: heat. Hardenability - ANSWER-The hardenability of a metal alloy is its capability to be hardened by heat treatment. It should not be confused with hardness, which is a measure of the material's resistance to