C-Si-Mn-B系贝氏体钢的强度及强化机制  

Strength and Strengthening Mechanism of C-Si-Mn-B Bainitic Steel

作　　者：黄维刚[1] 方鸿生[2] 郑燕康[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]清华大学材料科学与工程系,北京100084

出　　处：《钢铁研究学报》2003年第1期38-41,共4页Journal of Iron and Steel Research

摘　　要：测定并分析了中碳和中低碳C Si Mn B系贝氏体钢的抗拉强度及强化机制。结果表明,该钢具有较高的强度和良好的塑性。减小贝氏体铁素体板条宽度和提高板条内的位错密度对贝氏体的强化有较大贡献。在贝氏体 马氏体复相组织的强化机制中,应考虑下贝氏体板条对原奥氏体晶粒的分割细化效应以及马氏体对贝氏体板条变形的约束作用。由强化机制计算的强度值与实测值有较好的一致性。The tensile strength and the strengthening mechanism of medium and mediumlow carbon CSiMnB bainitic steels were tested and analysised. The results showed that the tested bainitic steels have relative high strength and good plasticity. The decrease of bainitic plate width and increase of dislocation density in bainitic plates are contributory to bainitie strength. The partitioning and refining effect on prior austenite grains by lowerbainitic plates and the constraint effect of martensite plates on deformation of bainitic plates should be considered for strengthening mechanism of mixtures of bainite and martensite. The strength values calculated by the strengthening mechanism model is consistent with measured values.

关 键 词：贝氏体钢 贝氏体/马氏体复相组织 强国度 强化机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]