摘要
采用MMS-200型热力模拟试验机研究了20CrMnTi钢棒材在不同终轧温度下的热变形行为,分析了不同终轧温度及轧后冷却速率对显微组织转变及力学性能的影响。结果表明:棒材终轧温度一定时,随着冷却速率增大,显微组织变细,硬度提高;在冷却速率一定时,随着终轧温度升高,显微组织变粗,硬度降低;在终轧温度为950℃、轧后冷却速率为0.2～0.3℃·s^(-1)时,可以获得细小均匀的等轴晶粒,能将退火态的硬度控制在197 HBW左右。
The hot deformation behavior of the bars was discussed by means of hot compression tests on the MMS-200 thermal simulator. The differences of microstructure and mechanical properties corresponding to different final rolling temperature and cooling rate of steel was studied. The results indicated that the bars would obtain fine and uniform isometric crystal when the finishing temperature and cooling rate of 20CrMnTi bars was 950 ℃ and 0. 2-0. 3 ℃ · s-1 , therefore the hardness can be controlled at about 197 HBW.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第2期6-9,共4页
Materials For Mechanical Engineering
