镜像铣和化学铣切对2A12铝合金表面完整性与疲劳行为的影响
Effect of Mirror Milling and Chemical Milling on Surface Integrity and Fatigue Behavior of 2A12 Aluminum Alloy
摘 要
对比研究了金刚石刀具和硬质合金刀具镜像铣,以及化学铣切2A12-T4铝合金试样的表面形貌、表面粗糙度、残余应力、硬度和疲劳性能。结果表明:镜像铣等厚度平板试样(一面硬质合金刀具加工,一面金刚石刀具加工)的细节疲劳额定强度比化学铣切试样提高了4.27%,而金刚石刀具镜像铣下陷试样的细节疲劳额定强度则提高了22.46%;金刚石刀具镜像铣试样获得了比硬质合金刀具镜像铣试样以及化学铣切试样更高的疲劳抗力。金刚石刀具镜像铣在试样表面引入了残余压应力,提高了表面硬度,降低了表面粗糙度,并未使表层组织受到破坏,因此裂纹萌生和扩展阻力提高。化学铣切试样表面存在的点蚀坑、晶间腐蚀缺陷及残余拉应力,以及硬质合金刀具镜像铣试样表面存在的较深刀痕沟槽和残余拉应力均促进了裂纹的萌生。
化学铣切
2A12-T4铝合金
疲劳性能
表面完整性
mirror milling
chemical milling
2A12-T4 aluminum alloy
fatigue property
surface integrity
Abstract
The surface morphology, surface roughness, residual stress, hardness and fatigue properties of 2A12-T4 aluminum alloy samples processed by diamond tool and carbide tool mirror milling and chemical milling were studied by contrast. The results show that comparing with that of chemical milled samples, the detailed fatigue rated strength of carbide tool mirror milled equal thickness flat sample (one side for carbide tool processing and the other side for diamond tool processing) was improved by 4.27%, while that of diamond tool mirror milled depression sample was improved by 22.46%. The fatigue resistance of diamond tool mirror milled sample was higher than that of carbide tool mirror milled and chemical milled samples. The diamond tool mirror milling introduced residual compressive stress on the sample surface, improved the surface hardness, decreased the surface roughness, and did not damage the surface structure, resulting in increase of crack initiation and propagation resistance. The pits, intergranular corrosion defect and residual tensile stress on chemical milled sample surface, and deep tool grooving and residual tensile stress on carbide tool mirror milled sample surface all promoted the initiation of cracks.
中图分类号 TG714 DOI 10.11973/jxgccl202307003
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(52271071);国家重大科技项目(J2019-I-0016-0015)
收稿日期 2023/2/3
修改稿日期 2023/6/12
网络出版日期
作者单位点击查看
备注史建猛(1979-),男,陕西西安人,高级工程师,硕士
引用该论文: SHI Jianmeng,ZHANG Haibao,ZHANG Yueling,JIA Tianyi,WANG Xinlei,CHEN Yizhi,LIU Daoxin. Effect of Mirror Milling and Chemical Milling on Surface Integrity and Fatigue Behavior of 2A12 Aluminum Alloy[J]. Materials for mechancial engineering, 2023, 47(7): 14～21
史建猛,张海宝,张月玲,贾天一,王新磊,陈奕志,刘道新. 镜像铣和化学铣切对2A12铝合金表面完整性与疲劳行为的影响[J]. 机械工程材料, 2023, 47(7): 14～21
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【10】MADARIAGA A,GARAY A,ESNAOLA J A,et al.Effect of surface integrity generated by machining on isothermal low cycle fatigue performance of Inconel 718[J].Engineering Failure Analysis,2022,137:106422.
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【32】YADAV V K,GAUR V,SINGH I V.Combined effect of residual and mean stresses on fatigue behavior of welded aluminum 2024 alloy[J].International Journal of Fatigue,2022,155:106565.
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