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本文介绍了用俄歇电子谱、X射线能谱、扫描电镜和透射电镜对钼中的缺陷,特别是钼片的表面缺陷“白点”的研究结果。发现钼片白点实际上是由于钼中碳和氧等杂质偏聚而形成的一些脆性断裂区。钼粉颗粒尺寸分布不均匀造成杂质分布不均匀;碳和氧等杂质偏聚并形成化合物,导致钼坯料中组织不均匀,形成破碎区。碱洗过程中氧的进入加剧了破碎区的脆性,从而导致冷轧过程中出现白点。控制碱洗条件可以控制白点数,但不能改变坯料中杂质的不均匀分布。冷轧时可能会出现破点等其他缺陷。
This paper presents the results of Auger electron spectroscopy, X-ray spectroscopy, scanning electron microscopy and transmission electron microscopy on the defects in molybdenum, especially the “white spots” on the surface defects of molybdenum sheets. It is found that the molybdenum white spots are actually some brittle fracture zones formed due to segregation of impurities such as carbon and oxygen in molybdenum. Uneven distribution of the particle size of the molybdenum powder causes uneven distribution of the impurities; impurities such as carbon and oxygen segregate and form a compound, resulting in uneven microstructure in the molybdenum blank and formation of a crushing zone. Oxygen enters into the alkali washing process to exacerbate the fragility of the crushed area, resulting in the appearance of white spots during cold rolling. Control of alkaline washing conditions can control the number of white spots, but can not change the uneven distribution of impurities in the blank. Other defects such as break points may occur during cold rolling.