热轧变形量及退火工艺对钼板材组织和性能的影响

通过显微硬度测试、金相组织观察等手段研究了退火温度、退火时间及热轧变形量对热轧钼板显微硬度和再结晶晶粒尺寸的影响规律。研究结果表明：一定范围内提高退火温度及延长退火时间均有助于再结晶的进行，当总变形量为66％时，其最合适的退火工艺为l200oC下加热1～2h；随着热轧总变形量的增加，钼板的再结晶晶粒尺寸逐渐变小，其显微硬度呈现出逐渐增加的趋势。

Effects of Hot Rolling Deformation Rate and Annealing Process on Microstructure and Properties of Molybdenum Plates

The effects of annealing temperature, annealing time and hot rolling deformation rate on the micro-hardness and recrystallized grain size of hot-rolled molybdenum plates were studied by means of Vickers hardness tester and metallographic microscope, etc. The results show that fully recrystallized structure can be obtained when the annealing temperature increases from 900 ℃ to 1 200 ℃, and the grains do not grow up obviously at 1 200 ℃. The extension of annealing time is also helpful to recrystallization, but the grains grow up obviously when annealing time is prolonged to 4 hours. The proper annealing process for pure molybdenum plate is 1 200 ℃ for 1-2 hours when the total deformation rate is 66%. With the increase of the total deformation rate, the recrystallized grain size becomes finer and its distribution becomes more uniform, and the hardness has also increasing tendency.