Study on Low Plastic Strain Forming and Fatigue Modification of 6061 Aluminum Alloy
This paper focuses on the analysis of the influence of low plasticity polishing process parameters such as rolling times,lathe speed on the surface properties of 6061 aluminum alloy.Good fatigue strength-ening effect can all be obtained under these speeds.The 300 r/min speed can obtain the best strengthe-ning effect through rolling three times.Also,either the 900 r/min speed rolling twice or the 1 500 r/min speed rolling three times has a better hardening effect.Combined with the microhardness distribution of the section after rolling and the SEM fracture characterization analysis,it was found that the specimens that rolled once at a processing speed of 300 r/min showed the fracture caused by shear force,while the specimens that rolled twice and three times at 300 r/min and at a processing speed of 900 r/min showed the initiation behavior of multiple fatigue sources.While,the sample with a processing speed of 1 500 r/min was subjected to 3 rounds of rolling,where fatigue source originated internally.The consideration of strain rate dependent surface low plastic strain will significantly improve the fatigue service performance of 6061 aluminum alloy,providing new technical support for the further widespread application of aluminum alloy materials.
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