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5 - Cold Working Brass - CSUN

Experiment 5 - Cold Work, Recovery, Recrystallization and Grain Growth Objective To study the effects of cold Working on the microstructure and mechanical properties of 70/30 Cartridge Brass . Background A small percentage of the energy expended in plastically deforming a material remains stored in the metal as an increase in internal energy. Changes are produced in both its physical and mechanical properties. Principally, there is a marked increase in hardness and electrical resistivity with the amount of cold Working . Microstructurally, this increment in internal energy is associated with an increase in the dislocation density as well as the density of point defects, such as vacancies and interstitials.

Grain size determination is described in Appendix F, which should be read at this point. You ... Recovery - A low-temperature annealing heat treatment designed to eliminate residual stresses introduced during deformation without reducing the strength of the cold worked material.

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