大型轧辊快速刻花刻花点的微观结构研究

通过扫描电镜研究了激光刻花轧辊上刻花点的微观结构.研究表明,激光刻花后材料表面及附近有四个部分:熔凝区、相变区、热影响区和基材区;由于快速熔凝过程产生的极大过冷度,熔凝区主要是超细的微晶状的枝晶和胞状组织,其组织均匀,且极为致密,因而其硬度与耐腐蚀性能大大提高;激光扫描速度对相变硬化区和热影响区的大小有极大的影响.

Studies on the microstructure of the textured point on laser textured huge rolls

This paper studied the microstructure of laser texture rolls by SEM.Aftel laser caved,the four regions named melt region,phase change region,thermal effective region and substrate region,are formed near the surface.Du to the very large supper cooling rate brought by rapid solidification,the melt region consists of very fine microlitic dendritical or cytostate organization,which is well distributed and fine and compact.So the hardness and anti etching performance of the melt region are greatly improved .Furthermore,the scanning speed has an important influence on the size of phase change region and thermally affected region.