首页|直接淬火工艺对Cu-NiAl复合析出强化超高强钢组织性能的影响

直接淬火工艺对Cu-NiAl复合析出强化超高强钢组织性能的影响

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为满足舰船大型化、轻量化的发展要求,开发具有超高强度、良好韧性及优异焊接性能的新型舰船用钢,并实现其高效生产具有重要意义.采用扫描电子显微镜、电子背散射衍射、透射电子显微镜,对比研究了直接淬火(DQ)与再加热淬火(RQ)工艺对纳米级Cu-NiAl复合析出强化超高强钢组织与性能的影响.结果表明:DQ钢与RQ钢的显微组织均由板条马氏体组成,经过550 ℃回火后,DQT钢中形成了更细小的板条马氏体组织和更高的位错密度,为Cu-NiAl相高密度析出提供了更多的形核位置;与RQ钢相比,DQ钢具有更高的回火稳定性,回火后保留了更大密度和更高比例的小角度晶界.因此,在更显著的析出强化和细晶强化共同作用下,DQ钢回火后强度更高,屈服强度比RQT钢高100 MPa,达到1 425 MPa.
Effect of direct quenching process on microstructure and properties of Cu-NiAl co-precipitation strengthened ultra-high strength steel
It is of great significance to develop new types of shipbuilding steel with ultra-high strength,good toughness,and ex-cellent welding performance to meet the development requirements of large-scale and lightweight ships,and to achieve efficient production.Scanning electron microscopy,electron backscatter diffraction,and transmission electron microscopy were used to study the effects of direct quenching(DQ)and reheat quenching(RQ)processes on the microstructure and properties of nanoscale Cu-NiAl co-precipitation strengthened ultra-high strength steel.The results show that the microstructures of both DQ and RQ steels consist of lath martensite.After 550 ℃ annealing,the DQT steel forms a finer lath martensite microstructure and higher dislocation density,providing more nucleation sites for the high-density precipitation of Cu-NiAl phase.Compared with RQ steel,DQ steel has higher annealing stability,retaining a higher density and a higher proportion of small angle grain bounda-ries after annealing.Therefore,under the combined action of more pronounced precipitation strengthening and fine grain strengthening,the DQ steel exhibits higher strength after annealing,with a yield strength that is 100 MPa higher than that of RQT steel,reaching 1 425 MPa.

direct quenchingultra-high strength steelnanoscale Cu-NiAl co-precipitation phasetempering stabilitysmall an-gle grain boundariesmicrostructure and propertiesefficient production

董诗晴、张阳、郭思文、邓想涛、叶其斌

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东北大学轧制技术及连轧自动化国家重点实验室,辽宁 沈阳 110819

江苏省(沙钢)钢铁研究院,江苏 张家港 215625

直接淬火 超高强钢 纳米Cu-NiAl复合析出相 回火稳定性 小角度晶界 组织性能 高效生产

辽宁省科技重大专项项目东北大学第十六批大学生创新训练项目

2020 JH1/10100001221317

2024

10.13228/j.boyuan.issn1003-9996.20240404

轧钢
中国钢研科技集团有限公司

轧钢

CSTPCD北大核心
影响因子：0.881
ISSN：1003-9996
年,卷(期)：2024.41(4)