喷丸毛化对铍铜结晶辊表面组织和硬度的影响  

Influence of shot blasting on microstructure and hardness of beryllium copper casting roll surface

作　　者：王成全[1,2] 叶长宏 WANG Chengquan;YE Changhong(Research Institute,Baoshan Iron ＆ Steel Co.,Ltd.,Shanghai 201900,China;Shanghai Engineering Research Center of Strip Casting and Rolling,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900 [2]上海薄带连铸连轧工程技术研究中心,上海201900

出　　处：《宝钢技术》2018年第4期31-34,46,共5页Baosteel Technology

基　　金：上海市科学技术委员会资助课题:11DZ2282300

摘　　要：薄带连铸结晶辊表面形貌对生产带钢的凝固过程和产品表面质量有显著的影响,喷丸毛化处理是结晶辊表面形貌的一种重要处理方式。在实验室中采用钢丸丸粒在铍铜合金表面进行喷丸毛化处理后,铍铜合金试样表面形成随机分布的凹坑和凸起尖峰形貌,在变形区域形成冷变形滑移条纹和细小的形变孪晶。喷丸毛化对铍铜基体组织产生影响的深度约为100μm,在接近表面40μm深度范围内铍铜试样硬度明显增加,最大硬度值比基体均值增加20%以上,在距离表面深度60~100μm的次表层,尖峰位置铍铜试样硬度仍高于基体区域,而凹坑位置硬度与基体的差异则不显著,这主要是受铍铜合金的孪生和滑移变形机制影响。经过热震后毛化试样表层和基体的硬度处于同一水平。The surface topography of casting roll has a significant influence on the as-cast strip solidification process and the product surface quality during strip casting process,and the shot blasting treatment is an important way to achieve the suitable surface topography on the casting roll.The casting roll beryllium copper alloy was shot blasted by using steel pellets in the laboratory,and discontinuous peak and dent topography were achieved on the surface within a random distribution,in which the cold deformation slips band and fine deformation twins were formed. The deformed copper alloy thickness was about 100 μm during shot blasting process,and copper hardness value increased significantly within the thickness of 40 μm from surface,which maximum value increased by more than 20% compared with the mean substrate hardness value. Within thickness of 60-100μm from surface,the peak position hardness was still higher than copper substrate mean value,but the dent position hardness was not,which was mainly affected by copper alloy slip and twinning deformation mechanism. The surface hardness was similar to substrate after shot blasted sample treated with thermal shocking.

关 键 词：喷丸毛化 铍铜 结晶辊 薄带连铸 

分 类 号：TF777[冶金工程—钢铁冶金]