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

作者：Cui Jin-dong; Yi You-ping^*; Luo Guo-yun

来源：Advances in Materials Science and Engineering, 2017, 2017: 7059389.

DOI：10.1155/2017/7059389

• REDUCTION

In aeronautical machining industry, the most difficult problem to deal with is the distortion of aviation integral component, one main cause ofwhich 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 (H) x 1150 (W) x 5300 (L) 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-65MPa to 60MPa, compared with its counterpart after quenching from -170MPa to 140MPa. 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 (L) x 60 (W) x 40 (H) mm.

• 出版日期2017
• 单位中南大学