激光冲击+机械喷丸复合强化对铆接件微动疲劳性能的影响
Effect of Laser Shock Peening and Shot Peening Composite Strengthening on Fretting Fatigue Performance of Riveted Piece
刘梦金 1付雪松 2盖鹏涛 3吴凡 3孙一帆 1周文龙 2陈国清1
作者信息
- 1. 大连理工大学材料科学与工程学院,辽宁大连 116024
- 2. 大连理工大学材料科学与工程学院,辽宁大连 116024;大连理工(营口)新材料工程中心有限公司,辽宁营口 115004
- 3. 中国航空制造技术研究院,北京 100024
- 折叠
摘要
研究机械喷丸、激光冲击+机械喷丸复合强化 2种表面强化技术对铝合金铆接构件微动疲劳行为的影响.利用微动磨损实验机、疲劳实验机、X射线衍射仪、激光共聚焦显微镜、场发射扫描电镜等设备,测试表面强化技术对铝合金表面完整性、耐磨性、疲劳性能和微动损伤特征的影响.结果表明:机械喷丸、激光冲击+机械复合强化均可提升铆接件微动疲劳性能,机械喷丸提高 12倍,复合强化提升 5.4 倍.表面强化处理改变疲劳裂纹源位置,原始件裂纹萌生于铆接件圆孔 30°左右,喷丸强化后裂纹在圆孔接近 90°位置萌生.复合强化的残余压应力层深度为 1.00 mm,远大于机械喷丸的 0.25 mm.总体上,复合强化效果不理想,这是由于激光冲击技术不便于在小尺寸的铆接孔实施,同时强化过程连接孔变形,影响服役性能.
Abstract
The effect of shot peening as well as laser shock peening and shot peening composite strengthening on the fretting fatigue behavior of aluminum alloy riveted pieces was studied.The effect of surface strengthening technology on the surface integrity,fretting wear resistance,fatigue properties and fretting damage characteristics of aluminum alloy was studied with fretting wear test machine,fatigue test machine,X-ray diffractometer,laser confocal microscope,and field emission scanning electron microscope.The results show that shot peening as well as laser shock peening and shot peening composite strengthening can improve the fretting fatigue performance of riveted pieces,with the fretting fatigue life increasing 12 times after shot peening and 5.4 times after composite shot peening strengthening.The surface strengthening treatment changed the location of the fatigue crack source.The crack initiation location of the original riveted piece was about 30°in the round hole of the riveted piece,and changed to nearly 90° after shot peening.The depth of residual compressive stress layer of composite shot peening strengthening is 1 mm,which is much deeper than that of shot peening,0.25 mm.Overall,the strengthening effect of composite shot peening is not ideal.This is because laser shock technology is not easy to implement in the riveting holes of small size.In addition,the strengthening process induced the deformation of the connecting holes,affecting the service performance.
关键词
复合喷丸强化/2024铝合金/铆接件模拟/微动裂纹萌生/微动磨损Key words
composite shot peening/2024 aluminum alloy/simulation of riveted pieces/fretting crack initiation/fretting wear引用本文复制引用
基金项目
国家自然科学基金(51975084)
辽宁省自然科学基金(2022-YKLH-04)
中央高校基本科研业务费专项(DUT19LAB16)
辽宁省"兴辽英才计划"项目(XLYC1902084)
出版年
2024
NETL
NSTL
万方数据