ACICULAR MARTENSTTE IN LASER TREATED GREY CAST IRON
LI Zhang; HU Jiandong(Jilin University of Technology; Changchun); FANG Weijie; LU Jian(Jilin Institute of MachinecDesign; Changchun) (Manuscript received 28 August; 1985; revisd manuscript 14 January 1986)
Cite this article:
LI Zhang; HU Jiandong(Jilin University of Technology; Changchun); FANG Weijie; LU Jian(Jilin Institute of MachinecDesign; Changchun) (Manuscript received 28 August; 1985; revisd manuscript 14 January 1986). ACICULAR MARTENSTTE IN LASER TREATED GREY CAST IRON. Acta Metall Sin, 1987, 23(3): 299-319.
Abstract Laser quenched microstructure of HT 21-40 grey cast iron Was studied by transmission electron microscopy. Results indicated that the structure is consisted of fine acicular martensite and ultrafine grained austenite. The carbon content of austenite is about 1.8%, that can also be transformed into fine acicular martensite when cooled in liquid nitrogen.
