Document Type thesis Author Name Mitchell, Ian D URN etd-0512104-140359 Title Residual Stress Reduction During Quenching of Wrought 7075 Aluminum Alloy Degree MS Department Materials Science & Engineering Advisors 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/Defense 2004-05-06 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.
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