MSE_250_Lab_7-Annealing-ACW

MSE_250_Lab_7-Annealing-ACW - MSE 250 LAB#7 Annealing of...

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MSE 250 LAB #7 Annealing of Cold Rolled 70-30 Brass Objective : The purpose of this lab session is to observe the change in mechanical properties (hardness) that result from annealing (heating and holding for a controlled time and temperature). The grain size and shape is changed depending on the annealing temperature and time. Introduction : Even though crystal defects such as dislocations allow plastic deformation to occur at low stress, the large increase in their number during a heavy deformation (as produced by the cold work process) causes a metal alloy to be strengthened. This is because when many defects exist in the crystal lattice, it becomes more difficult for atoms to move - much like the difficulty to move in a crowd place. These cold work products can be quite strong and hard, but they also become too brittle and may have undesirable electrical/magnetic properties. Annealing is one of the important heat treatments to relief and normalizing the materials. In industry, this process can be used to recover the desired properties after the cold-stamping operation. In the annealing process, microstructure involves three sequential stages in respond to the thermal treatment, each proceeding faster at higher temperature: 1. Recovery . 2.
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This document was uploaded on 10/28/2011 for the course MSE 250 at Michigan State University.

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MSE_250_Lab_7-Annealing-ACW - MSE 250 LAB#7 Annealing of...

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