冷轧Ti-15Mo合金的再结晶行为及动力学分析

Recrystallization behavior and kinetic analysis of cold-rolled Ti-15Mo alloy

对冷轧Ti-15Mo合金进行了不同温度和时间的热处理,采用OM观察不同样品的金相组织,对比分析固溶温度和保温时间对显微组织的影响。通过分析不同固溶温度、时间与晶粒尺寸关系,系统地建立了3种再结晶晶粒长大的数学模型。对比Beck模型、Hillert模型、Sellars模型的计算值与实验值误差,得出最为精确模型,用于实际生产的数据支撑。结果表明,冷轧Ti-15Mo合金的再结晶晶粒尺寸随温度升高和保温时间延长而增大,且温度升高相比于保温时间在晶粒尺寸长大上影响更为显著。经计算值与实验数据对比,Sellars模型的计算值与实验值更为吻合,冷轧Ti-15Mo合金在750~900℃加热以及3~30 min保温的双重影响下,β再结晶晶粒的生长因子为2.69309,激活能为278.635 kJ/mol。

In this study cold-rolled Ti-15Mo alloy was heat treated at different temperatures and lengths of holding time.The metallographic organization of different samples were observed by using Optical Microscope(OM),and the effect of solid solution temperature and holding time on microstructure were compared and analyzed.Mathematical models for the growth of three recrystallized grains were systematically established by analyzing the relationship between different solid solution temperatures,lengths of holding time and grain sizes.The errors between the calculated and experimental values of Beck model,Hillert model and Sellars model were compared to arrive at the most accurate model for data support of actual production.The results show that the recrystallized grain size of cold-rolled Ti-15Mo alloy increases with the increase of temperature and holding time,and the effect of temperature increase on grain size growth is more significant than that of holding time.Compared with the experimental data,the calculated values of the Sellars model are more consistent with the experimental values.The growth factor and activation energy ofβrecrystallized grains are 2.69309 and 278.635 kJ/mol under the double influence of heating at 750-900℃and holding for 3-30 min.