In the strip-casting process,the surface topography of the casting roll has a significant influence on the solidification microstructure and surface quality of the as-cast strip. Shot-blasting treatment is an importan...In the strip-casting process,the surface topography of the casting roll has a significant influence on the solidification microstructure and surface quality of the as-cast strip. Shot-blasting treatment is an important way to achieve a suitable surface topography on the casting roll. In this study,a casting roll of beryllium copper alloy was shot blasted using steel pellets in the laboratory,resulting in a randomly distributed discontinuous peak and dent surface topography,in which cold deformation-slip bands and fine-deformation twins were formed. The thickness of the deformed copper alloy was about 100 μm during the shot-blasting process,and the copper hardness value increased significantly within 40 μm of the surface,with a maximum increase of more than 20% compared to the mean substrate hardness value. Within 60-100 μm of the surface,the hardness at the peak position was still higher than the copper substrate mean value,but the hardness at the dents was not,which was mainly due to the copper alloy slip and twinning deformation mechanisms. The surface hardness was similar to that of the substrate after the shot-blasted sample had been subjected to thermal shock. The molten steel first chilled and nucleated at the surface peaks of the casting roll;furthermore,fine dendrites grew and crossed over the middle of the dents. Therefore,the peak intervals of the shot-blasted surface are an important factor in solidification quality control.展开更多
对比分析12.5 mm 82B盘条在酸洗磷化与抛丸磷化两种不同工艺下的处理效果。通过硬度测试、磷化膜面质量、金相分析、表面形貌观察和能谱分析等手段对两种工艺处理结果进行检测分析。结果表明,酸洗磷化工艺在去除表面氧化物和油污方面更...对比分析12.5 mm 82B盘条在酸洗磷化与抛丸磷化两种不同工艺下的处理效果。通过硬度测试、磷化膜面质量、金相分析、表面形貌观察和能谱分析等手段对两种工艺处理结果进行检测分析。结果表明,酸洗磷化工艺在去除表面氧化物和油污方面更好,但对环境污染较大,生产时应严格控制酸液浓度、酸洗时间及废酸废水的处理;抛丸磷化工艺在环保方面更具优势,但在钢丝拉拔时模耗较高,生产时应降低磷化膜成分中P膜含量,确保后续的钢丝拉拔连续性和润滑效果。展开更多
文摘In the strip-casting process,the surface topography of the casting roll has a significant influence on the solidification microstructure and surface quality of the as-cast strip. Shot-blasting treatment is an important way to achieve a suitable surface topography on the casting roll. In this study,a casting roll of beryllium copper alloy was shot blasted using steel pellets in the laboratory,resulting in a randomly distributed discontinuous peak and dent surface topography,in which cold deformation-slip bands and fine-deformation twins were formed. The thickness of the deformed copper alloy was about 100 μm during the shot-blasting process,and the copper hardness value increased significantly within 40 μm of the surface,with a maximum increase of more than 20% compared to the mean substrate hardness value. Within 60-100 μm of the surface,the hardness at the peak position was still higher than the copper substrate mean value,but the hardness at the dents was not,which was mainly due to the copper alloy slip and twinning deformation mechanisms. The surface hardness was similar to that of the substrate after the shot-blasted sample had been subjected to thermal shock. The molten steel first chilled and nucleated at the surface peaks of the casting roll;furthermore,fine dendrites grew and crossed over the middle of the dents. Therefore,the peak intervals of the shot-blasted surface are an important factor in solidification quality control.
文摘对比分析12.5 mm 82B盘条在酸洗磷化与抛丸磷化两种不同工艺下的处理效果。通过硬度测试、磷化膜面质量、金相分析、表面形貌观察和能谱分析等手段对两种工艺处理结果进行检测分析。结果表明,酸洗磷化工艺在去除表面氧化物和油污方面更好,但对环境污染较大,生产时应严格控制酸液浓度、酸洗时间及废酸废水的处理;抛丸磷化工艺在环保方面更具优势,但在钢丝拉拔时模耗较高,生产时应降低磷化膜成分中P膜含量,确保后续的钢丝拉拔连续性和润滑效果。
