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COLD WORKING

COLD WORKING. EXPERIMENT # 8 Instructor: M.Yaqub. COLD WORKING. Cold working is the plastic or permanent deformation at room temperature. In this process, volume remains same. Shape of the metals are changed by using cold working process.

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COLD WORKING

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  1. COLD WORKING EXPERIMENT # 8 Instructor: M.Yaqub

  2. COLD WORKING • Cold working is the plastic or permanent deformation at room temperature. In this process, volume remains same. • Shape of the metals are changed by using cold working process. • After cold working process, hardness and strength of the metal increases due to increase in dislocation density.

  3. COLD WORKING PROCESS • Cold Rolling and wire drawing are the examples of cold working process.

  4. % COLD WORK • The % cold work is defined as • And also can be expressed as

  5. % COLD WORK (Continue) • Where A0 is the original area of cross section • Ad is the area after deformation • e is the strain.

  6. EFFECT OF CW ON TENSILE STRENGTH

  7. EFFECT OF CW ON YIELD STRENGTH

  8. EFFECT OF CW ON DUCTILITY

  9. LAB REPORT • Complete the Table provided to you in lab. Use excel for calculation and attach a print out with the lab report. • Draw a graph hardness vs %CW cumulative using excel, hardness on Y-axis and %CW cumulative on X-axis. Named it as Figure 1.

  10. LAB REPORT (Continue) • Draw another graph hardness vs %True strain cumulative using excel, hardness on Y-axis and True strain cumulative on X-axis. Named it as Figure 2. • Include the cover page in your lab report.

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