LIU Yao-wu. Characteristic of laser hardened structures of HT20-40 cast iron[J]. Editorial Office of Optics and Precision Engineering, 2000,(5): 458-461
LIU Yao-wu. Characteristic of laser hardened structures of HT20-40 cast iron[J]. Editorial Office of Optics and Precision Engineering, 2000,(5): 458-461DOI:
the structures characteristics and forming principle of hardened layer were studied. The results reveal that the laser-hardened zone of HT20-40 gray cast iron is consisted of three layers:(1)melting-chilling layer with whitening structure-refined ledeburite;(2)localized melting layer-graphite part is melted
island structure has the characteristics of casting and martensite;(3)solid transformation layer-very fine martensite
the original pattern of lamellar graphite remains basically. Meanwhile
localized melting layer disappears by proper technology control
and there only exists melting-chilling layer and solid transformation layer.