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The Determination of Residual Stress in Quenched and Cold-Compressed 7050 Aluminum Alloy T-Section Forgings by the Contour Method and Neutron Diffraction

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Abstract

Residual stresses were determined through the thickness of quenched and quenched followed by cold compression 7050 aluminum alloy T-section forgings using the contour method and neutron diffraction. 7050 T-section forgings are used for the manufacture of the connecting joints of wing and fuselage. Inevitably high residual stresses are introduced during the quenching process of 7050 T-section forgings, which could be reduced by cold compression to overcome the effect of residual stress on machining deformation. The longitudinal residual stresses obtained by the two techniques achieved good agreement in both trend and magnitude in both the quenched and quenched followed by cold compression 7050 T-section forgings. The stress-free lattice spacing of Al(311), the Bragg reflection used for the neutron measurements, was obtained from a 5-mm slice using the plane-stress condition, and its variation through the thickness is insignificant in both the quenched specimen and quenched followed by cold compression specimen. A comparison of the residual stresses in the quenched specimen and quenched followed by cold compression specimen showed significant changes in range of residual stresses from (− 304, 262 MPa) induced by quenching process to (− 125, 142 MPa) due to 3% cold compression. The percentage reduction in residual stress in the quenched specimen due to 3% cold compression was (46, 59%).

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Acknowledgments

This research activity was financially supported by the National Natural Science Foundation of China (Grant 11605293 and 51327902) and the State Key Laboratory of High Performance and Complex Manufacturing (Grant Kfkt2016-04).

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Authors and Affiliations

  1. Department of Nuclear Physics, China Institute of Atomic Energy, Beijing, China

    Xiaolong Liu, Yuntao Liu & Dongfeng Chen

  2. Helmholtz-Zentrum Berlin für Energie und Materialien, Hahn Meitner Platz 1, Berlin, Germany

    Robert C. Wimpory

  3. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, China

    Hai Gong & Yunxin Wu

  4. Department of Mechanical and Electrical Engineering, Central South University, Changsha, China

    Hai Gong, Yaoqiong Liu & Yunxin Wu

  5. AVIC The First Aircraft Institute, Xi’an, China

    Yaoqiong Liu & Chen Li

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  1. Xiaolong Liu
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Correspondence to Hai Gong.

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Liu, X., Wimpory, R.C., Gong, H. et al. The Determination of Residual Stress in Quenched and Cold-Compressed 7050 Aluminum Alloy T-Section Forgings by the Contour Method and Neutron Diffraction. J. of Materi Eng and Perform 27, 6049–6057 (2018). https://doi.org/10.1007/s11665-018-3676-0

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  • DOI: https://doi.org/10.1007/s11665-018-3676-0

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