Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-0512104-140359

Document Typethesis
Author NameMitchell, Ian D
TitleResidual Stress Reduction During Quenching of Wrought 7075 Aluminum Alloy
DepartmentMaterials Science & Engineering
  • Richard D. Sisson, Jr., Advisor
  • Yiming Rong, Committee Member
  • Md. Maniruzzaman, Committee Member
  • Keywords
  • Quench Factor Analysis
  • Aluminum 7075
  • Deformation
  • Residual stress
  • Quenching
  • Date of Presentation/Defense2004-05-06
    Availability unrestricted


    The finite difference method was used to calculate the variable heat transfer coefficient required to maximize mechanical properties of heat treated wrought 7075 aluminum alloy without causing residual stress. Quench simulation enabled determination of maximum surface heat flux bordering on inducing plastic flow in the work piece. Quench Factor Analysis was used to correlate cylinder diameter to yield strength in the T73 condition. It was found that the maximum bar diameter capable of being quenched without residual stress while meeting military mechanical design minimums is 2”. It was also found that the cooling rate must increase exponentially and that the maximum cooling rate needed to achieve minimum mechanical properties is well within the capability of metals heat treatment industry.

  • Mitchell.pdf

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