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采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、电子背散射衍射(EBSD)技术和电子万能试验机等研究了等温淬火温度对51CrMnV弹簧钢组织及力学性能的影响。结果表明：使用高温油淬火介质进行等温淬火处理后，51CrMnV弹簧钢的组织主要为马氏体、贝氏体铁素体、残留奥氏体及碳化物；经过860℃奥氏体化30 min后淬入280℃的高温油中等温处理30 min后，51CrMnV弹簧钢的力学性能较好，其抗拉强度为1641 MPa、总伸长率为15.57%、断面收缩率为33%,且该工艺条件下的拉伸试样断口为韧性断裂，这归因于该工艺条件下试验钢具有亚微米级贝氏体铁素体和弥散分布的碳化物，多相微观组织的协同作用提高了51CrMnV弹簧钢的综合力学性能。
Abstract：Effect of isothermal quenching temperature on microstructure and mechanical properties of 51CrMnV spring steel was studied by means of optical microscope(OM), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), electron backscatter diffraction(EBSD) technique and electronic universal testing machine. The results show that after using high-temperature oil quenching medium for isothermal quenching treatment, the microstructure of the 51CrMnV spring steel mainly consists of martensite, bainite ferrite, retained austenite and carbides. After austenitizing at 860 ℃ for 30 min and quenching in high-temperature oil at 280 ℃ for 30 min, the mechanical properties of the 51CrMnV spring steel are good, with the tensile strength of 1641 MPa, the total elongation of 15.57%, and the reduction of area of 33%. The fracture surface of the tensile sample under this process condition is ductile fracture, which is attributed to the submicron bainitic ferrite and dispersed carbides in the experimental steel under this process condition. The synergistic effect of multiphase microstructure improves the comprehensive mechanical properties of the 51CrMnV spring steel.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2023-0530
中图分类号:TG142.1;TG156.3
引用信息:
[1]许荣福,齐鹏,马驿皓等.等温淬火温度对51CrMnV弹簧钢组织及性能的影响[J].材料热处理学报,2024,45(09):199-210.DOI:10.13289/j.issn.1009-6264.2023-0530.
基金信息:
2023年山东省中小企业能力提升项目(2023TSGC0809)