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以SWRH82BCr和B82MnQL盘条作为热镀锌的试验材料,利用拉伸试验机、反复弯曲试验机对其力学性能进行了测试,借助金相显微镜、扫描电镜分析了几种工艺下的横截面和轴向截面以及拉拔断口的组织形貌,测试了显微硬度。结果表明:在冶炼时加入Cr等合金元素可明显改变盘条在后续加工中的性能,SWRH82BCr拉拔后抗拉强度由原来的1250 MPa提高至1676 MPa,B82MnQL拉拔钢丝抗拉强度由原来的1192 MPa提高至1670 MPa。采用新工艺和助镀配方,钢丝镀锌后SWRH82BCr抗拉强度下降幅度为1.5%,B82MnQL抗拉强度下降幅度为1%,均低于传统的8%。稳定化后,SWRH82BCr镀锌钢丝的平均抗拉强度为1727MPa,反复弯曲为5次,扭转次数为13次;B82MnQL镀锌钢丝的平均抗拉强度为1710 MPa,反复弯曲为5次,扭转次数为21次。稳定化后,硬度较镀锌的明显提高且其分布均匀。通过优化工艺,可提高SWRH82BCr和B82MnQL盘条的抗拉强度。
Using SWRH82BCr and B82MnQL wire rod as hot-dip galvanizing test material, the mechanical properties of hot-dip galvanized steel were tested by tensile testing machine and repeated flexural testing machine. The metallographic and scanning electron microscopes were used to analyze the cross-section and axial The microhardness was tested to the section and the microstructure of the drawn fracture. The results show that the addition of alloying elements such as Cr can significantly change the performance of the wire rod during the subsequent processing. The tensile strength of SWRH82BCr after drawing increases from 1250 MPa to 1676 MPa, and the tensile strength of B82MnQL drawn wire increases from the original 1192 MPa to 1670 MPa. Using the new technology and plating recipe, the tensile strength of SWRH82BCr after galvanized steel wire is reduced by 1.5% and the tensile strength of B82MnQL is reduced by 1%, both of which are lower than the traditional 8%. After stabilization, the average tensile strength of SWRH82BCr galvanized steel wire is 1727MPa, repeated bending is 5 times and the number of twisting is 13 times. The average tensile strength of B82MnQL galvanized steel wire is 1710 MPa, repeated bending is 5 times, the number of twisting is 21 times. After stabilization, the hardness is significantly higher than that of zinc plating and its distribution is even. By optimizing the process, the tensile strength of the SWRH82BCr and B82MnQL wire rods can be increased.