球铁点阵分布激光表面强化的微硬度分布  

Microhardness Distribution of Ductile Iron Modified by Laser with Space Array

作　　者：巴发海[1] 鄢国强[1] 吴炜[2] 虞钢[2] 甘翠华[2] 

机构地区：[1]上海材料研究所,上海200437 [2]中国科学院力学研究所非线性力学国家重点实验室,北京100080

出　　处：《中国激光》2005年第2期287-291,共5页Chinese Journal of Lasers

基　　金：2000~2003年中国科学院知识创新工程重大项目(KGCX1 11)资助课题

摘　　要：　采用经过二元光学变换后呈3×3和7×7 二维点阵分布的脉冲激光束对球铁试样作了表面强化处理。针对点阵分布脉冲激光表面强化球铁材料提出了微硬度分布合理表征的统计方法。即在整个月牙形强化区横截面上按30μm×30μm或30μm×50μm划分网格,沿层深方向按列(行)对网格的交叉点进行硬度测试。然后,利用数学方法对硬度分布进行统计处理并绘制等高线轮廓图。应用表明,对于强化区具有多相交错分布特征的球铁材料,与传统方法相比,采用统计方法能够比较准确地评价强化层深度和微硬度分布特征。同时,在一定程度上揭示了激光强化工艺与强化效果之间的关系。Pulsed laser beams with two-dimensional array distribution by binary optical elements was used to modify surface processing for ductile iron. The statistical method of microhardness distribution of modified area was proposed to evaluate reasonably the microhardness distribution character, in which the space is divided into a columns 30 μrn × 30 μrn or 30 μm × 50 μm grids in the transect of modified area. The microhardness is tested in the intersections of grids. As a result, the data obtained are processed by math statistical method and drawn the contour map. The application shows that the statistical method for microhardness test could reasonably describe modified layer depth and microhardness distribution in the case of multiphase in comparison with conventional method. On some extent, the statistical method may disclose the relation between laser modifying technology and results.

关 键 词：激光技术 脉冲激光 表面强化 球墨铸铁 强化层深 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]