Specimen preparation method of steel billet for dendrite corrosion macro-examination
WU Chunlei1, SHI Chunyang2, SUN Ye1, LIU Yan1, ZHU Yueyang3
1. School of Metallurgy Engineering, Liaoning Institute of Science and Technology, Benxi 117004, Liaoning, China; 2. Global 100-100 School, Liaoning Institute of Science and Technology, Benxi 117004, Liaoning, China; 3. PMA Pacific Machinery Company Limited, Suzhou 215126, Jiangsu, China
Abstract：As a novel macro-examination method, dendrite corrosion macro-examination demands higher requirements for the surface roughness and the preparation efficiency of steel billet specimens. The specimens were ground by an abrasive belt machine. The operation duration and the variation of surface roughness were investigated to determinate the optimum process for preparing steel billet specimens by abrasive belt grinding. The results show that for the specimens with a bumpy surface, the abrasive belt with mesh number 24 (700 μm) can be used to quickly remove the oxide layer and obtain a smooth and flat surface, which reaches the same effect as that by the milling machine. The abrasive belt with mesh number 120 (120 μm) can be used as the initial one to fine grind the flat surface. The grinding directions of the two successive abrasive belts remains vertical. With the mesh number increasing, the surface roughness gradually decreases. After completing grinding with the mesh number 2 000 (6.5 μm), both the horizontal and vertical surface roughness can reach less than 0.1 μm, which meets the requirements of the dendrite corrosion macro-examination. During the fine grinding, it is requisite to grind the specimens for a longer time when using the initial mesh number or the mesh number higher than 600 (23 μm), to ensure the fine grinding effect on the specimen surface. Thus, by abrasive belt grinding, the specimen preparation for the dendrite corrosion macro-examination can be efficiently completed.
2023, Vol. 42 
