6061铝合金表面低塑性应变成型及其疲劳改性研究  

Study on Low Plastic Strain Forming and Fatigue Modification of 6061 Aluminum Alloy

作　　者：陈建新 陈茂林 丁泓月 崔驿墩 王卿州 马娟 朱振宇 CHEN Jianxin;CHEN Maolin;DING Hongyue;CUI Yidun;WANG Qingzhou;MA Juan;ZHU Zhenyu(School of Mechanical Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]成都大学机械工程学院,四川成都610106

出　　处：《成都大学学报（自然科学版）》2024年第2期180-187,共8页Journal of Chengdu University（Natural Science Edition）

基　　金：2021年四川省大学生创新创业训练计划项目(S202211079046);四川省科技厅科技计划项目(2022NSFSC0328)。

摘　　要：重点分析了滚压次数、车床转速等低塑性抛光工艺参数对6061铝合金表面性能的影响,3种转速下都可获得较好的疲劳强化效果,300 r/min的转速通过滚压3次可获得最佳的强化效果,900 r/min的转速滚压2次与转速为1500 r/min滚压3次的强化效果较好.结合滚压后的截面显微硬度分布与SEM断口表征分析发现,加工转速为300 r/min滚压次数1次的试样表现为受剪切力引起的断裂,300 r/min滚压2次、3次与加工转速为900 r/min的试样则表现为由多个疲劳源萌生行为;加工转速为1500 r/min的试样,滚压3次后疲劳源萌生于内部.考虑应变率相关的表面低塑性应变将显著改善6061铝合金的疲劳服役性能,为铝合金材料的进一步广泛应用提供新的技术支持.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 strengthening effect can all be obtained under these speeds.The 300 r/min speed can obtain the best strengthening effect through rolling three times.Also,either the 900 r/min speed rolling twice or the 1500 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 1500 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.

关 键 词：6061铝合金 低塑性应变 疲劳断口 显微硬度 疲劳性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]