Abstract
The formation of phosphorous surface inverse segregation (SIS) in twin-roll cast strips of low-carbon steels was studied. High phosphorous strips were fabricated by using a pilot twin-roll strip caster and a melt/substrate contacting apparatus, respectively. Solidification structures of strips were observed and analyzed, and phosphorus distributions along longitudinal sections of strips were investigated and discussed. The results showed that solidification structures of all strips were columnar grains, either integrated or coarse in the strip made by the melt/substrate contacting apparatus or damaged in some degree in cast strips; and that during cast strip solidification, enrichment of phosphorus occurred between columnar grains, and the average phosphorus concentration near the surface in the strip with 0. 15% of phosphorus was measured to be about 0. 27% which was obviously higher than that in the bulk.
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Kim H, Kobayashi, Tsukamoto, et al. Effect of Cooling Rate on Microstructure Evolution of Rapidly Cooled High-Impurity steels [J]. Materials Science and Engineering. 2005, 403A(1/2): 311.
Liu Z, Lin Z, Qiu Y, et al. Segregation in Twin Roll Strip Cast Steels and the Effect on Mechanical Properties [J], ISIJ International, 2007, 47(2): 254.
Zhou G, Liu Z, Qiu Y, et al. The Improvement of Weathering Resistance by Increasing P Contents in Cast Strips of Low Carbon Steels [J]. Material and Design, 2009, 30(10): 4342.
Strezov, Herbertson J. Experimental Studies of Interfacial Heat Transfer and Initial Solidification Pertinent to Strip Casting [J]. ISIJ International, 1998, 38(9): 959.
Sahoo, Balasubramaniam R. On Phase Distribution and Phase Transformations in Phosphoric Irons Studied by Metallography [J]. Metallurgical and Materials Transactions, 2007, 38A(8): 1692.
ZHANG Qi. Study on Solidification Character in Twin Roll Casting Strip [J]. Shanghai Steel and Iron Research, 1990 (5): 25.(in Chinese).
Park J, Oh K, Ra H Y. Microstructure and Crystallographic Texture of Strip-Cast 4. 3%Si Steel Sheet [J]. Scripta Materialia, 1999, 40(8): 881.
Fujita, Sato, Kitagawa, et al. Solidification and Roll-Bonding of Shells in Twin-Roll Casting Process [J]. ISIJ International, 1989, 29(6): 495.
Park J, Choi K, Szpunar J, et al. Effect of Mn Negative Segregation Through the Thickness Direction on Graphitization Characteristics of Strip-Cast White Cast Iron [J]. Scripta Materialia, 2002, 46(3): 199.
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Foundation Item: Item Sponsored by National Basic Research Program of China (2004CB619108); National Natural Science Foundation of China (50574018)
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Zhou, Gp., Liu, Zy., Yu, Sc. et al. Formation of Phosphorous Surface Inverse Segregation in Twin-Roll Cast Strips of Low-Carbon Steels. J. Iron Steel Res. Int. 18, 18–23 (2011). https://doi.org/10.1016/S1006-706X(11)60018-6
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DOI: https://doi.org/10.1016/S1006-706X(11)60018-6