1.新疆农垦科学研究院机械装备研究所,石河子 832000
2.南京钢铁股份有限公司板材事业部,南京 211500
闫强军(1984—),男,博士,高级工程师;E-mail:281012634@qq.com
收稿:2026-07-09,
修回:2026-08-13,
录用:2026-08-17,
网络首发:2026-10-22,
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闫强军,陈刚,阮昊等.在线及离线淬火对Q1300E超高强结构钢板组织及性能的影响[J].特殊钢,
Yan Qiangjun,Chen Gang,Ruan Hao,et al.Effect of Online and Offline Quenching on Microstructure and Properties of Q1300E Ultra-High Strength Structural Steel Plate[J].Special Steel,
超高强结构钢广泛应用于重大装备领域,其强度与低温韧性的协同匹配是研究重点。传统离线淬火+回火(RQ-T)工艺存在工序长、组织粗化等问题。采用在线淬火+回火(DQ-T)工艺,旨在通过细化组织同步改善强韧性。通过金相显微镜(OM)、透射电镜(TEM)及电子背散射衍射(EBSD)对比研究了DQ-T和RQ-T工艺下Q1300E钢板的显微组织与精细结构,并进行了室温拉伸和-40 ℃夏比冲击试验。结果表明,在线淬火+190 ℃回火工艺性能最佳,屈服强度达到1 435 MPa,同时,-40 ℃冲击功达到52.5 J。相较于RQ-T工艺,DQ-T工艺细化了板条亚结构、提高了位错密度,增强了淬透性,同时获得了更多残余奥氏体,有效改善了低温韧性,从而同步提升了强度和-40 ℃冲击功。
Ultra-high strength structural steel is widely used in heavy equipment fields, and the synergistic matching of its strength and low-temperature toughness is a research focus. The conventional offline quenching and tempering (RQ-T) process has issues such as long processing cycles and microstructural coarsening. In this study, the direct quenching and tempering (DQ-T) process was adopted to synergistically improve strength and toughness through microstructural refinement. The microstructure and fine structure of Q1300E steel plates subjected to DQ-T and RQ-T processes were comparatively investigated by optical microscopy (OM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD). Room-temperature tensile tests and Charpy impact tests at -40 °C were also conducted. The results show that the direct quenching and tempering at 190 °C process exhibits the best performance, with a yield strength reaching 1 435 MPa and an impact energy of 52.5 J at -40 °C. Compared with the RQ-T process, the DQ-T process refines the lath substructure, increases the dislocation density, enhances hardenability, and simultaneously obtains more retained austenite, which effectively improves low-temperature toughness, thereby synergistically enhancing both strength and impact energy at -40 °C.
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