马骏, 郑宏光, 黄坚, et al. An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab[J]. Special Steel, 2012, 33(3): 61-64.
马骏, 郑宏光, 黄坚, et al. An Analysis on Forming Mechanism of Longitudinal Crack of N08810 Corrosion Resistant Alloy 200 mm Thickness Casting Slab[J]. Special Steel, 2012, 33(3): 61-64.DOI:
An analysis on longitudinal crack of 200 mm x 1 300 mm casting slab of UNS NO881O alloy (/% : 0. 06C
0. 45Si
0. 92Mn
0. 016P
0. 001S
30. 15Ni
19. 80Cr
47. 81 Fe
0. 33Ti
0. 23Al
0. 014 0N) produced by one-strand vertical continuous casting machine has been earned out by optical
scanning electron microscope
energy dispersive spectrometer and Gleeble-3800 thermal simulation machine. Results show that the longitudinal crack extends along grain boundary of coarse columnar crystal towards inner casting slab
the depth of crack is 18 ~ 20 mm. Test of high temperature plasticity of alloy obtains that as temperature ≥1100 °C the reduction of area of alloy dramatically decreases. And the analysis indicates that at early period of solidification the connection between columnar dendrites is weak
the boundary of columnar crystal easily cracks
in addition the brittle phase TiC deposits at grain boundary lead to stress concentration
the crack easily extends along grain boundary to form the longitudinal crack finally.