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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
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)
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
intermediate transformation structure
control cooling
low carbon bainitic steel
quasipolygonal ferrite
