程永兴
,
李根富
,
俞少罗
,
王惠敏
金属学报
本文采用5kW横流二氧化碳激光器进行了Fe-Ni-Cr合金涂层和45号钢基体合金化处理,用电子显微术分析了熔化区的特征,揭示了所谓激光“亮带”的本质。结果表明,“亮带”属于熔化区;是平面晶一个纵切断面,其宽度等于平面晶的高度,随扫描速度的增加和激光功率的减小而变窄。
关键词:
激光合金化
,
rapid solidification
,
plane crystal
CHENG Yongxing LI Genfu YU Shaoluo Shanghai University of Engineering Science
,
Shanghai
,
China WANG Huimin No.11 Institute of China State Shipbuilding Corp.
,
Shanghai
,
China Associate Professor
,
Dept.No.5
,
Shanghai University of Engineering Science
,
350 Xianxia Road
,
Shanghai
,
China
金属学报(英文版)
The Fe-Ni-Cr coating laver has been alloyed with 45 steel base metal by transverse.flow type CO_2 gas laser of maximum output 5kW.The characteristics of the melted zone and the es- sence of the“bright band”has been investigated using the electron microscopy.The results show that the“bright band”belongs to the melted zone and is a vertical section of the plane crystal,The width of the“bright band”equals the height of the plane crystal,which decreases with the increase of laser beam scanning rate and the decrease of laser power.This has been explained in terms of constitutional supercooling G/R.
关键词:
laser alloying
,
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