摘要
介绍了采用鞍钢常规喷气冷却连续退火机组试制一种冷轧超高强耐候马氏体钢的工艺流程,并使用金相显微镜、扫描电镜、透射电镜、X射线衍射仪及室温拉伸试验等手段对其显微组织和力学性能进行了表征。结果表明,试验钢组织由板条马氏体和少量残留奥氏体组成,马氏体有明显的分解现象,同时在马氏体基体中有大量弥散分布的渗碳体和碳化物析出。试验钢的综合力学性能良好,屈服强度可达1 039 MPa,抗拉强度达到1 131 MPa,断后伸长率A50为9.0%。通过微合金元素V和Ti的沉淀强化和细晶强化作用,试验钢的强度提高。
The technological process of producing cold-rolled ultra-high strength weatherproof martensite steel,trial-produced in a conventional jet cooling continuous annealing line of Anshan Iron Steel Co.,Ltd was introduced,and its microstructure and mechanical properties were also characterized through optical microscopy, scanning electron microscopy, transmission electron microscope,x-ray diffraction and tensile tests. The results showed that the microstructure of tested steel was composed of lath martensite and a small amount of retained austenite. The martensite was decomposed apparently and a certain amount of cementites and carbides precipitated in the martensite matrix. The test steel exhibited excellent comprehensive mechanical properties,its yield strength,tensile strength and elongation was up to 1 039 MPa,1 131 MPa and 9. 0%,respectively.Microalloying with V and Ti improved the strength of tested steel by precipitation strengthening and fine-grain strengthening.
出处
《上海金属》
CAS
北大核心
2017年第5期47-50,共4页
Shanghai Metals
关键词
马氏体钢
耐候
连续退火
组织
性能
martensite steel, weatherproof, continuous annealing, microstructure, mechanical property
