在线直接淬火工艺对低碳马氏体钢组织性能的影响

为了开发一种集优异拉伸、冲击性能于一体的高性能钢铁材料，满足大型工程机械、高层建筑和严酷地质服役环境油井管等应用要求，实验研究了在线直接淬火工艺对Q890低碳高强马氏体钢组织性能的影响。通过金相、扫描、透射、EBSD分析以及在不同温度下对样品进行拉伸试验和冲击试验，对不同奥氏体变形程度样品的马氏体组织和力学性能进行对比，并分析了对马氏体钢强韧性能的影响。结果表明，采用在线直接淬火工艺可获得超薄奥氏体组织，促使马氏体亚结构细化，使钢获得良好的强韧性配合。

Effect of on-line direct quenching process on microstructure and properties of low carbon martensitic steel

In order to develop a high performance steel material with excellent tensile and impact properties,meet the application requirements of large construction machinery,high-rise buildings and oil well pipes in harsh geological service environment,the influence of direct on-line quenching process on the martensite structure and properties of Q890 low carbon and high strength steel were studied by test.Through metallographic,scanning,transmission,EBSD and tensile and impact tests at different temperatures,the martensite structure and mechanical properties of the samples with different degrees of austenite deformation were compared,and the influence mechanism on the strength and toughness of martensite steel was analyzed.The results show that the ultra-thin austenite microstructure can be obtained by on-line controlled rolling process,the martensite substructure can be refined,and the good performace matching of strength and toughness of steel can be obtained.