摘要
对优质中碳钢坯表面出现的发纹缺陷及危害进行研究 ;借助磁力探伤与显微观察等方法 ,对发纹的形貌和氧化物进行分析 .找出钢坯表面发纹形成的原因 ,揭示钢坯表面发纹生成与钢中残铝量的关系 ;提出适当控制钢中的残铝量可降低钢坯表面发纹的形成 .
An investigation of the morphology of the hair_cracks and oxides formed on the surface of quality medium_carbon steel billets was carried out by means of magnetic inspection and metallography, and the harms of these defects to the steel properties were assessed. The mechanism by which the cracks were produced was elucidated, and the relation of the formation of the cracks with residual aluminum present in the steel determined. It is then suggested that the amount of the residual aluminum be properly controlled, so as to reduce the formation of crack.
