ELECTRON MICROANALYSIS FOR LASER MELTED ZONE IN 45 STEEL WITH Fe-Ni-Cr COATING

Abstract

Abstract: 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.

Key words: laser alloying, 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. ELECTRON MICROANALYSIS FOR LASER MELTED ZONE IN 45 STEEL WITH Fe-Ni-Cr COATING[J]. Acta Metallurgica Sinica (English Letters), 1989, 2(3): 190-193.

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ELECTRON MICROANALYSIS FOR LASER MELTED ZONE IN 45 STEEL WITH Fe-Ni-Cr COATING

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