Effect of Quenching Medium on Mechanical Properties of Alloy Al7049-T6 and Lowering of its After-Machining Warpage

Sani, Saeed Aliakbari; Feizabadi, J.; Pourgharibshahi, Mohammad; Hashemi, Seyyed Hamidreza

doi:10.1007/s11041-017-0118-9

Cited by 1 publication

(1 citation statement)

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“…1,2 These distortions are driven by residual stresses, which arise from the necessity to rapidly cool precipitation hardened alloys as part of the heat treatment step, necessary to develop high strengths. 3,4 In this investigation, the residual stresses in heat treated 7075 aluminium alloy blocks have been characterised using two neutron diffraction strain scanning instruments. High magnitude residual stresses arise during quenching from the solution heat treatment temperature.…”

Section: Introductionmentioning

confidence: 99%

Cold Compression of 7075 and Factors Influencing Stress Relief

Robinson

Wimpory

Tanner

et al. 2018

Materials Performance and Characterization

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The residual stresses in heat treated 7075 aluminium alloy blocks have been characterised using neutron diffraction, x-ray diffraction and incremental centre hole drilling. Samples were quenched to induce high magnitude residual stresses which were then stress relieved by the controlled application of plastic deformation using a cold compression technique. The experimental variables investigated were the quench water temperature, and the post quench delay. This delay is considered to influence the final residual stress magnitudes because of hardening precipitation occurring by natural aging during the period between quenching and the application of plastic deformation. Cold compression significantly lowered the residual stresses in all samples. Neutron diffraction measurements demonstrated a benefit to applying plastic deformation as soon as possible after quenching. However, this beneficial effect was not evident when characterising surface residual stresses using hole drilling or x-ray diffraction.

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Section: Introductionmentioning

confidence: 99%