采用纯度为99.95%的钼粉分别压制、烧结出相同厚度钼板坯,烧结钼板坯经1400℃加热后,经多道次热轧至不同的厚度,实际热轧变形量分别为42%、66%、71%、76%、81%、86%。经不同变形量热轧后的钼板在1200℃退火1h后,进行纵截面金相组织观察、EBSD分析和晶粒尺寸测量。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。EBSD采集方案:首先对样品表面进行机械研磨和抛光,然后在25%高氯酸和75%的酒精混合溶液中,以10±2 V的电压和45±5 A的电流进行电解抛光,持续时间为120-300 s。通过EDAX配置的电子背散射衍射(EBSD)进行测量,扫描步长设为0.05°,扫描时间为30 min/样。
Molybdenum slabs with the same thickness are pressed and sintered with molybdenum powder with a purity of 99.95%. The sintered molybdenum slabs are heated at 1400°C and then hot-rolled to different thicknesses through multiple passes. The actual hot-rolling deformations are 42%, respectively. 66%, 71%, 76%, 81%, 86%. After the molybdenum plate hot-rolled with different deformations was annealed at 1200℃ for 1h, the longitudinal section metallographic structure observation, EBSD analysis and grain size measurement were carried out. 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. EBSD collection scheme: first mechanically grinding and polishing the surface of the sample, and then electropolishing in a mixed solution of 25% perchloric acid and 75% alcohol at a voltage of 10 ± 2 V and a current of 45 ± 5 A, duration Is 120-300 s. The measurement is carried out by electron backscatter diffraction (EBSD) configured by EDAX, the scanning step is set to 0.05°, and the scanning time is 30 min/sample.