The Metallographical Characteristics and the Formation Mechanism of Longitudinal Surface Cracks in CC Slabs

Evolution of Columnar γ Grain in Low Carbon Steel and Its Refinement by Additional Elements in Thin Slab Casting Simulator

“…In the etched micro-structure, film-like a grains were observed along the g grain boundaries. 12,13) The film like a grains were used as markers for the g grain boundaries.…”

Influence of Phosphorus on Solidification Structure in Continuously Cast 0.1 mass% Carbon Steel.

“…The etching reagents were a saturated picric acid for the dendrite structure revelation and a nital or a mixture of picral and nital for the prior-g structure revelation. 6,21) Solidification structures were examined by both optical microscopy and EPMA. The secondary dendrite arm spacing, S 2 , was evaluated by the linear intercept method, by counting the numbers of arms over a given length of the primary arm, using the optical microscopic observation in the L section.…”

“…In the etched microstructure, film-like a grains were observed along the prior-g grain boundaries. 6,21) Then the film-like a grains were used as markers for the prior-g grain boundaries.…”

“…It may cause hot surface cracking of slabs in low alloy steels, since the hot ductility depends largely on the g grain size [3][4][5] and the intergranular fracture in the g phase results in the surface cracks. [3][4][5][6][7][8][9] Thus it is important to clarify the mechanism of the g structure evolution after solidification.…”

Review on Hot and Control Rolling of HSLA Steel

“…Intergranular fracture is enhanced in coarse grained structures leading to hot surface cracking of slabs in some HSLA steels and subsequent difficulties when it comes to hot rolling them [8][9][10].…”