학술논문
根部圆角滚压强化的高精度钛合金螺栓疲劳失效研究 / Research on Fatigue Failure of High-Precision Titanium Alloy Bolt Strengthened by Root Fillet Rolling
Document Type
Academic Journal
Author
刘婧颖; 李浩楠; 徐昊; 杨知硕; 林忠亮; 王洪飞; 白清顺; LIU Jingying; LI Haonan; XU Hao; YANG Zhishuo; LIN Zhongliang; WANG Hongfei; BAI Qingshun
Source
机械制造与自动化 / Machine Building & Automation. 52(6):15-44
Subject
Language
Chinese
ISSN
1671-5276
Abstract
为研究根部圆角滚压强化处理后高精度螺栓的疲劳失效特征,开展根部圆角滚压强化的高精度钛合金螺栓疲劳失效断口的检测与研究.分析螺栓根部圆角滚压强化工艺的特点;对比螺栓滚压表面处理工艺对螺栓疲劳断裂的影响,对高精度螺栓疲劳试验后的外观和断口进行宏观形貌和微观显微特征研究;探讨涂铝钛合金螺栓的裂纹源特征.研究结果表明:根部圆角滚压螺栓的疲劳断裂断口呈现显著的韧性断裂特征;涂铝、喷丸或抛光处理能够增强其断口的等轴韧窝特征,证实了以韧性断裂为主的断裂机理,同时研究发现了铝涂层的界面剥离特征.
In order to investigate the characteristics of fatigue failure of high-precision titanium alloy bolts after rolling strengthening for root fillet,the measurement and analysis of fatigue failure fractures were carried out.The characteristics of the rolling strengthening techniques of bolt root fillet were analyzed.The influence of various surface processing techniques for rolling bolts was compared,and the features of appearance as well as fracture of bolts were studied from macroscopic and microscopic views.The crack source characteristics of aluminum-coated bolts were discussed.The research results show that the fatigue fracture of root fillet of bolts after rolling exhibits significant ductile fracture characteristics,and aluminum coating,shot peening or polishing process can enhance the equiaxed dimple characteristics of the fracture,which confirms the domination of ductile fracture.Meanwhile,the study also reveals the interfacial peeling characteristics of aluminum coating.
In order to investigate the characteristics of fatigue failure of high-precision titanium alloy bolts after rolling strengthening for root fillet,the measurement and analysis of fatigue failure fractures were carried out.The characteristics of the rolling strengthening techniques of bolt root fillet were analyzed.The influence of various surface processing techniques for rolling bolts was compared,and the features of appearance as well as fracture of bolts were studied from macroscopic and microscopic views.The crack source characteristics of aluminum-coated bolts were discussed.The research results show that the fatigue fracture of root fillet of bolts after rolling exhibits significant ductile fracture characteristics,and aluminum coating,shot peening or polishing process can enhance the equiaxed dimple characteristics of the fracture,which confirms the domination of ductile fracture.Meanwhile,the study also reveals the interfacial peeling characteristics of aluminum coating.