EPRI Nuclear Power Plant Materials Midterm Exam And Correct Solutions 2024.

Brittleness - correct answer The opposite of ductility. Brittle metals exhibit a small percentage of elongation under stress before failure. Cold Shut - correct 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 - correct answer The property of conducting heat or electric current. Crack lamination - correct answer A defect appearing in sheets or strips as a segregation or in layers. Degradation - correct answer Damage caused over time to components and materials caused by a range of physical processes, resulting in component failure. Ductility - correct 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 - correct 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 - correct answer Releases energy, i.e.: heat. Hardenability - correct 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