喷丸覆盖率对2024-T351铝合金表面完整性的影响  

Effect of Shot Peening Coverage on Surface Integrity of 2024-T351 Aluminum Alloy

作　　者：徐刚 薛涛 胡彦华 肖雄 曹一 张琪[2] XU Gang;XUE Tao;HU Yanhua;XIAO Xiong;CAO Yi;ZHANG Qi(AVIC Xi’an Aircraft Industry Group Company Ltd.,Xi’an 710089,China;Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中航西安飞机工业集团股份有限公司,西安710089 [2]西北工业大学,西安710072

出　　处：《航空制造技术》2024年第13期106-112,共7页Aeronautical Manufacturing Technology

摘　　要：喷丸覆盖率对零件的服役性能具有十分重要的影响。本文以2024-T351铝合金作为研究对象,通过调整喷丸进给速度获得4种喷丸覆盖率:88.3%、100%、200%、400%。使用扫描电子显微镜、粗糙度仪、残余应力分析仪、微观硬度计等研究了喷丸覆盖率对表面形貌、表面粗糙度、残余应力和微观硬度的影响。随着喷丸覆盖率的增加,试样表面粗糙度先升高后下降。100%覆盖率的喷丸试样表面粗糙度Ra达到最大值4.601μm。在400%的覆盖率下,试样表面出现较多的褶皱及微裂纹。喷丸覆盖率的增加导致残余压应力最大值的提高和残余应力场深度的增大。喷丸试样的微观硬度和硬化层深度随覆盖率的增加而增大,对应于88.3%、100%、200%和400%覆盖率的喷丸试样表面微观硬度分别增加了18.4%、22.8%、25.1%、27.2%。Peening coverage has essential effects on the service performance of parts.In this paper,aluminum alloy 2024-T351 was subjected to pneumatic shot peening with different coverage of 88.3%,100%,200% and 400% by adjusting feeding speed.The surface topography and microstructure,roughness,residual stress and microhardness were investigated using a scanning electron microscope,roughness tester,residual stress instrument and Vickers hardness tester.The surface roughness increases first and then decreases with the increase of peening coverage.The average surface roughness of peened sample with 100% coverage is 4.601μm,which is the highest value.Moreover,the peened surface shows significant folds and microcracks owing to the high coverage of 400%.The increase of peening coverage leads to the enlargement of the maximum compressive residual stress and depth of the compressive residual stress layer.Similarly,the maximum hardness and hardened layer depth are enhanced with peening coverage.The maximum hardness corresponding to peening coverage of 88.3%,100%,200% and 400% is increased by 18.4%,22.8%,25.1% and 27.2%,respectively.

关 键 词：喷丸覆盖率 表面完整性 表面粗糙度 残余应力 微观硬度 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]