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Cold Work and Annealing in Metal Processing: Review and Examples

This session covers essential concepts in materials engineering, focusing on cold work and annealing processes. We will explore the applications of cold work in metal processing and the significance of annealing. Key phenomena associated with the annealing process are discussed, along with their impact on cold worked metals. Practical problems will illustrate cold work calculations and processes for drawing copper wire, enhancing understanding of ductility and yield strength requirements. Through demonstrations and review questions, participants will deepen their grasp of these critical metal processing techniques.

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Cold Work and Annealing in Metal Processing: Review and Examples

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Presentation Transcript

  1. Materials Engineering – Day 8 • Review of Cold Work and Annealing • Demonstration • Metal Processing Examples

  2. Review Questions • What is cold work (CW) and how is it used in metal processing? • What is annealing and how is it used in metal processing? • Name three phenomena associated with the annealing process. Describe what happens to the Cold Worked metal as each occurs.

  3. Sample Cold Work Calculation • Can you calculate the cold work associated with cold rolling a 0.25 inch thick plate down to a thickness of 0.15 inches?

  4. Example Problem – Based on Figure 7.19 A copper wire must be drawn to a diameter of 1/8 inches. We are starting with stock having diameter of 1.0 inches. The wire’s final %EL ductility must be greater than 20%. The yield strength must exceed 30 ksi. Describe the processing of this wire. (Maybe multiple steps?)

  5. Example Problem – Based on Figure 7.19 – Final Step of CW Observe that 10% < %CW < 16%. Settle on 13%. Calculate the diameter at the start of the final step.

  6. Exercise Continued. We can see that a number of steps of cold work followed by annealing must be carried out. The %CW is arbitrary excep in the last step, in which we have to go with 13% CW

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