高强度低碳贝氏体钢工艺和组织对性能的影响  

Effects of process parameters and intermediate transformation structure on mechanical properties of a high strength low carbon bainitic steel

作　　者：聂燚[1] 董文龙[2] 赵运堂[1] 尚成嘉[1] 侯华兴[2] 贺信莱[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]鞍山钢铁集团公司,鞍山114021

出　　处：《北京科技大学学报》2006年第8期733-738,共6页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究"863计划"资助项目(No.2003AA331020)

摘　　要：通过对Mn-Cu-Nb-B系列低碳贝氏体钢的等温转变及连续冷却转变组织的研究，发现该系列微合金钢在500～700℃可发生多种类型中温组织转变．冷却速度和终冷温度对最终组织类型和性能有很大影响，终冷温度控制在630℃，可得到准多边形铁素体、粒状贝氏体和细小M／A组元的混合组织，该类型组织屈服强度可达到600MPa，且具有较好的塑性和低温冲击性能．在了解低碳贝氏体钢组织转变特点的基础上，利用冷却制度控制中温转变组织类型能优化低碳贝氏体钢的性能。Based on the isothermal treatment and continuous cooling test of an Mn-Cu-Nb-B low carbon bainitic steel, it was found that several types of intermediate transformation could be formed in the range of 500- 700℃. Cooling rate and finish cooling temperature have much effect on the final microstructure and mechanical properties of the steel. When the finish cooling temperature was selected around 630℃, a proper combination of quasipolygonal ferrite, granular bainite and fine M/A could be obtained. The yield stress of this type of microstructure could reach 600 MPa, with a better plasticity and low - temperature impact toughness. A proper control cooling process influences the intermediate transformation products, in this way the mechanical properties of a low carbon bainitic steel can be fairly optimized.

关 键 词：中温转变组织 控制冷却 低碳贝氏体 准多边形铁素体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]