被引排行
Study on stress corrosion properties of hot-plated steel wire for bridge cable
ZHANG Zeling;WANG Linfeng;LUO Guoqiang;XIE Zhengyuan;FANG Feng;JIANG Jianqing;As the main bearing material of long-span bridges, hot-dip galvanized steel wire should have good mechanical properties and stress corrosion resistance. With the increase of steel wire strength, the stress corrosion sensitivity is also increasing. The stress corrosion resistance of hot-dip galvanized steel wire has become one of the key parameters affecting the application of high-strength steel wire. In this paper, the effect of strength grade and surface quality on the sensitivity of stress corrosion of hotdip galvanized steel wire is investigated by FIP test and electrochemical method. The fracture morphology of stress corrosion is analyzed. Experimental results show that the stress corrosion fracture time of 1860 MPa grade and 2060 MPa grade steel wire for bridge cable is similar, but the stress corrosion time of the latter is more discrete. The rougher the steel wire surface is, the higher the stress corrosion sensitivity will be. As the surface of 2060 MPa steel wire is polished with 800 mesh abrasive paper, the stress corrosion fracture time is significantly shortened. The fracture morphology can be divided into crack source region, crack propagation region and transient fracture region. The crack mainly originates from the surface. Under the existing composition and production process conditions, the stress corrosion performance of 2060 MPa hot-dip galvanized steel wire can meet the application requirements. However, higher strength wire should be further investigated.
Multi-pass cold drawing simulation and process optimization of ultra-high strength steel wires
KANG Xiaolong;BAO Siqian;TIAN Renmin;HU Jiarui;LIU Chen;During the cold drawing process, the plastic deformation of the steel wires is not uniform, and obvious residual stress can be generated inside the steel wires after drawing, which will greatly affect the mechanical properties of the steel wires. In this paper, the finite element model of multi-pass cold drawing of ultra-high strength steel wires is established by using Abaqus. The influence of die half cone angle, drawing pass, length of sizing belt and friction coefficient on the residual stress of steel wires after cold drawing is studied. The influence of various process parameters on the residual stress and plastic deformation uniformity of steel wires is also analyzed. Based on the results, the drawing process parameters are optimized.