采用50mm厚的钨板坯通过换向轧制工艺成功制备出厚度为18mm的热轧钨板。分别对1300℃、1400℃退火30min、60min、90min退火后的钨板表面和纵截面进行金相组织观察，以考察退火时间对钨板再结晶晶粒组织的影响。金相组织采集方案：试样经过机械磨削和抛光成平整、光亮、无磨痕或抛光划痕的镜面，采用10-20%的氢氧化钠+铁氰化钾混合液（氢氧化钠与铁氰化钾质量比为1:1）对样品进行腐蚀，腐蚀后的样品在金相显微镜下放大100×或200×进行金相组织观察。

A hot-rolled tungsten plate with a thickness of 18mm was successfully prepared using a 50mm-thick tungsten slab through a reversing rolling process. The surface and longitudinal sections of the tungsten plates annealed at 1300℃, 1400℃ for 30min, 60min, and 90min were observed for the metallographic structure to investigate the effect of annealing time on the recrystallized grain structure of the tungsten plate. Metallographic structure collection scheme: The sample is mechanically ground and polished into a smooth, bright, and non-abrasive or polished mirror surface, using a 10-20% sodium hydroxide + potassium ferricyanide mixture (sodium hydroxide and potassium ferricyanide) The mass ratio of potassium ferricyanide is 1:1) The sample is corroded, and the corroded sample is magnified 100× or 200× under a metallurgical microscope to observe the metallographic structure.