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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 7059389, 6 pages
https://doi.org/10.1155/2017/7059389
Research Article

Numerical and Experimental Research on Cold Compression Deformation Method for Reducing Quenching Residual Stress of 7A85 Aluminum Alloy Thick Block Forging

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Correspondence should be addressed to Yi You-ping; nc.de.usc.liam@pyy

Received 24 May 2016; Revised 31 July 2016; Accepted 8 March 2017; Published 19 March 2017

Academic Editor: Sutasn Thipprakmas

Copyright © 2017 Cui Jin-dong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In aeronautical machining industry, the most difficult problem to deal with is the distortion of aviation integral component, one main cause of which is the existence of quenching residual stress of forgings, especially for large-sized ones. Therefore, it is important to study the methods that can reduce the quenching residual stress. In this work, the distribution of quenching residual stress of 7A85 aluminum alloy thick block forging, as well as the effect of cold compression deformation method on reducing quenching residual stress, has been investigated by simulation. The results show that, in length direction of 7A85 aluminum alloy thick block with a large size of 260 () × 1150 () × 5300 () mm, quenching residual stress can be significantly reduced by about 2.5% cold compression deformation along the direction of highness, with residual stress in length direction ranging from −65 MPa to 60 MPa, compared with its counterpart after quenching from −170 MPa to 140 MPa. Then a cold compression experiment was carried out, in which the forging residual stress on the surface was measured by X-ray diffraction device. The experimental results indicate that the optimal compression deformation value is 1%-2%, reducing 70% residual stress for 7A85 aluminum alloy specimens in size of 100 () × 60 () × 40 () mm.