目的：增强B82 MnQL材料的抗拉强度。方法以B82 MnQL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测试,借助金相显微镜、扫描电镜分析几种镀锌工艺下的横截面和轴向截面以及拉拔断口的组织形貌,同时测试显微硬度。结果 B82 MnQL盘条拉拔后钢丝的抗拉强度由原来的1250 MPa提高至1670 MPa。断面收缩率由32.5%下降至7%。采用新镀锌工艺和助镀配方,B82MnQL钢丝镀锌后抗拉强度下降幅度为8%,低于传统的10%~15%。稳定化后B82MnQL的扭转次数为20次左右,反复弯曲次数为6次左右,强度由1650 MPa提高至1710 MPa,硬度值比镀锌后有较大提高,由镀锌后的430HV升高至450HV,而且分布均匀。结论通过优化镀锌工艺,能大幅提高B82 MnQL盘条的抗拉强度。
ABSTRACT:Objective To enhance the tensile strength of the B82MnQL material. Methods The B82MnQL wire rod was used as the material for hot dip galvanizing experiment, and its mechanical properties were tested using tensile testing machine and repeated bending testing machine. The microstructures of the cross section, the axial section and the drawing fracture were analyzed by means of optical microscopy and scanning electron microscopy. Results The tensile strength of the B82MnQL wire rod after drawing was increased from 1250 MPa to 1670 MPa. The shrinkage rate of the cross section was decreased from 32. 5% to 7%. Using the new galvanizing technology and the formula of the assistant plating, the tensile strength of the galvanized B82MnQL steel wire was decreased by 8%, lower than traditional 10% ~15%. After stabilization, the B82MnQL′s torsion value was about 20 times, with about 6 times of repeated bending. The strength was increased from 1650 MPa to 1710 MPa. The hardness value was higher than that of the galvanized material, raised from 430HV to 450HV, and uniformly dispersed. Conclusion Through optimization of the galvanizing process, the tensile strength of B82MnQL wire rod was largely enhanced.
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