EPRI EF Nuclear Power Plant Materials Certification Latest Update Graded A+

EPRI EF Nuclear Power Plant Materials Certification Latest Update Graded A+ Brittleness The opposite of ductility. Brittle metals exhibit a small percentage of elongation under stress before failure. Cold Shut 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 The property of conducting heat or electric current. Crack lamination A defect appearing in sheets or strips as a segregation or in layers. Degradation Damage caused over time to components and materials caused by a range of physical processes, resulting in component failure. Ductility 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 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 Releases energy, i.e.: heat. Hardenability 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 indentation or scratching. The hardenability of ferrous alloys, namely steels, is a function of the carbon content and other alloying elements, the grain size of the austenite, and the cooling rate. Hardness The property of a material that enables it to resist plastic deformation, penetration, indentation, and scratching. Lattice The Three-dimensional array of the atoms in a metal molecule, in which the array is regular, repeating configuration in all directions. Machinability Machinability describes how a metal reacts to mechanical deformation by removing chips, with respect to the amount of metal effectively removed and the surface finish attainable. The mechanical properties of the metal will be the factors that influence the machinability of a metal. Malleability The ability of a metal to exhibit large deformation of plastic response when being subjected to compressive force. pH The measure of the acidity or alkalinity of a solution. Plastic deformation A dimensional change that does not disappear when the initiating stress is removed. It is usually accompanied by some elastic strain. In plastic deformation, bonds are broken which means the material will not return to its original shape when stresses are removed. Pores Internal voids in a material