EFFECT OF DEFORMATION ON MECHANICAL PROPERTIES OF COLD DRAWN LOW CARBON GALVANIZED STEEL WIRE
Cold-drawn low-carbon galvanized steel wire is widely used in light industry and construction industry for its good corrosion resistance,welding performance,good comprehensive performance and low price.The deformation is the key factor affecting its mechanical properties,production cost and yield.The work hardening process of Q235 cold drawn low carbon galvanized steel wire under different deformation was studied by microstructure analysis,mechanical properties measurement and fracture observation,and the reason of arrowhead crack on the surface of steel wire was analyzed.The results show that when the true strain increases from 0 to 2.41,the tensile strength and hardness of cross section increase parabola with the increase of the strain variable,the tensile strength increases from 586.8 MPa to 1 157.1 MPa,and the hardness of cross section increases by 5.8 HV compared with the longitudinal section.At the initial stage of plastic deformation,the maximum work hardening rate is 364.7 MPa.When the true strain increases from 0 to 1.91,the work hardening rate decreases from 364.7 MPa to 162.2 MPa,and when the true strain increases from 1.91 to 2.41,the work hardening rate increases to 172.0 MPa.The CaO inclusion in the steel wire is the main cause of wire breakage and surface arrowhead crack.
万方数据
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