论文部分内容阅读
利用Gleeble-3500热模拟试验机研究了不同变形温度(550、600、650、700℃)和不同变形速率(0.001、0.01、0.1、1、10 s-1)对热轧态中碳钢温变形过程中变形行为的影响,并结合热加工图探明了在细小晶粒铁素体基体上形成均匀分布细小渗碳体颗粒复相组织的最佳工艺窗口。结果表明,温变形过程中,会发生铁素体再结晶以及渗碳体片层动态球化行为,其微观组织演变对流变应力影响较大;根据绘制的热加工图,温变形的适宜温度区间为630~700℃,速率区间为0.30~10和0.001~0.007 s-1,在该工艺区间变形,初始组织转变为细小均匀铁素体基体上分布着细小粒状渗碳体的复相组织。
The effects of different deformation temperatures (550, 600, 650 and 700 ℃) and different deformation rates (0.001, 0.01, 0.1, 1 and 10 s-1) on the hot deformation of hot rolled carbon steel were investigated by using Gleeble- The influence of the deformation behavior during the process and the combination of the hot working diagrams to find out the optimum process window for the formation of uniformly distributed fine cementite microstructure on the fine grain ferrite matrix. The results show that recrystallization of ferrite and dynamic spheroidization of cementite lamellae occur during the thermal deformation, and the microstructure evolution has a great influence on the flow stress. According to the drawn hot working diagram, the suitable temperature range Which ranged from 630 ℃ to 700 ℃ and ranged from 0.30 to 10 and 0.001 to 0.007 s-1. During the process, the initial microstructure was transformed into a complex microstructure with fine grainy cementite distributed on the surface of the fine uniform ferrite matrix.