采用费氏粒度分别为2.3、3.3、5.4μm的钼粉，利用相同等静压成形、烧结工艺得到烧结板坯，在同等条件下进行轧制和退火，对退火前后的样品进行金相组织观察和密度、显微硬度和晶粒尺寸测量。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×进行组织观察，采用线性截距法来测量晶粒尺寸大小。

Using Fischer grain size of 2.3, 3.3, 5.4μm molybdenum powder, using the same isostatic pressing and sintering process to obtain a sintered slab, rolling and annealing under the same conditions, the metallographic structure observation of the samples before and after annealing And density, microhardness and grain size measurement. Metallographic structure collection plan: The sample is mechanically ground and polished to a smooth, bright, and no-wear or polished scratched 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 structure, and the linear intercept method is used to measure the grain size.