作　　者： ; ; ; ; ; ; ;

机构地区： 东北大学材料与冶金学院

出　　处： 《钢铁研究学报》 2006年第7期46-51,共6页

摘　　要： 用Gleeble-1500热模拟实验机测定了低碳铌微合金钢变形后的连续冷却转变曲线（CCT曲线），并在实验室对该实验钢采用不同的工艺进行了控制轧制和控制冷却的实验。研究了工艺参数对实验钢力学性能和微观组织的影响，分析了低碳铌微合金钢的强韧化机制。热模拟实验结果表明，实验钢在较宽的冷却速度范围（0．5～30℃／s）内可以获得贝氏体组织。控轧控冷的实验结果表明，实验钢的组织主要为铁素体和贝氏体。随着终轧温度的降低，组织得到细化，强度提高，但屈强比也随之增加；降低卷取温度使组织中的贝氏体含量略有增加，强度有所提高。初步探讨了贝氏体对实验钢性能的影响，为制定合适的生产工艺制度提供了依据。 Continuous cooling transformation diagram of low carbon steel microalloyed with Nb after hot deformation was determined by using Gleeble-1500 hot simulator. Controlled rolling and controlled cooling were carried out by using different schedules. Effect of finish rolling temperature and coiling temperature on the mechanical properties and microstructure were investigated, and strengthening mechanisms of steel were analyzed. Thermal simulation results revealed that bainite structure could be obtained at a cooling rate in range of 0. 5-30 ℃/s. and transformation products mainly consist of ferrite and bainite, and the microstructure could be refined and the strength of the steel increased, but yield ratio increased with low finish rolling temperature. The lower coiling temperature is beneficial to strength increment due to the increase of volume fraction of bainite. The effect of bainite on the properties of steel is discussed to provide suitable parameters for production.

关 键 词： 微合金钢 控轧控冷 贝氏体 力学性能 铌

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]