The Influence of Si on Microstructure and Mechanical Properties of Hot-Rolled Wire Rods for Cable Steel Wire Ropes
The cross section and longitudinal section microstructure morphology of two different Si contents hot-rolled wire rods were observed using scanning electron microscopy and energy spectrum(EBSD)instruments.The tensile properties of the hot-rolled wire rods were tested using a universal testing machine.The results show that with the increase of Si con-tent,the undercooling of pearlite transformation increases,and the size of pearlite colony and pearlite interlamellar spac-ing in hot-rolled wire rods decrease.The Si element causes the Mn element to segregate in the cementite,increasing its sta-bility and reducing the spheroidization of the cementite lamellae.The Si element weakens the texture strength of the pearl-ite in the transverse and longitudinal sections of the wire rod,leading the pearlite structure more uniform and the orienta-tion more random.The Si element can greatly improve the strength of hot-rolled wire rods and finished steel wires,while slightly improving plasticity.The tensile strength of low Si wire rod is 1 134 MPa,and the uniform elongation is 7.1％;The tensile strength of high Si wire rod is 1 263 MPa,and the uniform elongation is 7.3％.The tensile strength of the low Si wire is 1 937 MPa,and the uniform elongation is 2.2％;The tensile strength of the high Si wire is 2 106 MPa,and the uniform elongation is 2.3％.
Cable Steel Wire RopeHot-Rolled Wire RodSi ElementPearliteMicrostructure and Mechanical Properties
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