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Investigation of Segregation Behavior in the Riser/Castings Junction of Heavy-section Steel Castings  

Kim, Ji-Tae (Department of Materials Processing Engineering, Graduate School, Pukyung National University)
Park, Heung-Il (Department of Materials Processing Engineering, Graduate School, Pukyung National University)
Kim, Woo-Yeol (Department of Materials Processing Engineering, Graduate School, Pukyung National University)
Lee, Byung-Woo (Department of Materials Processing Engineering, Graduate School, Pukyung National University)
Publication Information
Journal of Korea Foundry Society / v.30, no.4, 2010 , pp. 130-136 More about this Journal
Abstract
Sulfide segregation behavior, characteristics of solidification microstructure and compositional distribution in the riser/castings junction of heavy-section main bearing support (MBS) steel castings were investigated; Sulfide streaks of A segregation were formed in the transitional region from columnar grain to coarse equiaxed grain and floated with aggregation of the dendritic free crystal. Solute segregation behaviors of elements Si, P and S were V shape negative segregation from the bottom of the castings to upper part of the riser with the reference of vertical center-line of the specimen block. Those of elements C and Mn were V shape negative segregation in the main body and A shape positive segregation in the riser of the casting. Just beneath the pipe shrinkage in the riser segregation ratio of each element was the highest, and that of S was 3.6 times higher, C 3.3 times, P 2.1 times, Si 1.6 times and Mn 1.0 times respectively. [Mn/S] ratio of the specimen block was distributed in the wide range of 20~275.
Keywords
Segregation; Sulfur Print; Macrostructure; Mn/S ratio; Steel castings;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 J. K. Brimacombe and K. Sopimachi, "Crack formation in the continuous casting of steel", Metall. Trans. B, 8B (1977) 489-505
2 C. L. Briant and S. K. Banerji, "Intergranular failure in steel: the role of grain-boundary composition", Int. Metals Rev., .4 (1978) 164-199
3 A. Chojecki, I. Telejko and T. Bogacz, "Influence of chemical composition on the hot tearing formation of cast steel", Theo. App. Frac. Mech., 27 (1997) 99-105   DOI   ScienceOn
4 ASM Handbook, 6 (1997) 88-106
5 J. Campbell, Castings practice, Elsevier, (2004) 120-165
6 Steel Casting Handbook, 6th edition, ASM International, (1995) 7/1-17
7 Metals Handbook, 10th edition, ASM international, Vol.15, Casting, (1988) 577-588
8 M. C. Flemings, "Our understanding of macrosegregation: Past and present", ISIJ Int., Vol. 40, No.9, (2000) 833-841   DOI   ScienceOn
9 A. Ghosh, "Segregation in cast products", Sadhana, Vol.26, Parts 1&2, (2006) 5-24
10 C. E. Sims, "The nonmetallic constituents of steel", Trans. Metall. Soc. AIME, 215 (1959) 367-392
11 J. Campbell, Castings, 2nd edition, (2003) 139-147
12 K. Tashiro, T. Todoroki and S. Kimura, "Consideration on the formation mechanisms of macroscopic segregation in large steel ingot and castings", ISIJ, Vol.57, No.10 (1971) 1654-1675
13 S. K. Choudhary and A. Ghosh, "Morphology and segregation in continuously cast steel billets", ISIJ Int., Vol.34, No.4 (1994) 338-345   DOI   ScienceOn
14 C. Beckermann, Modelling of macrosegregation: applications and future needs", International Materials Reviews, Vol.47, No.5 (2002) 243-261   DOI   ScienceOn
15 G. S. Mann and L. H. Van Vlack, "FeS-MnS relationships in the presence of excess iron", Metall. trans. B, 7B (1976) 469-475
16 G. A. Teledo, Influence of sulfur and Mn/S ratio on the hot ductility of steels during continuous casting", Steel research, Vol.64, No.6 (1993) 292-299   DOI
17 H. Nakata and H. Yasunaka, "Effect of sulfur and manganese on hot ductility of steels at high temperature", Trans. ISIJ, 26 (1986) B-98
18 F. Toda, M. Matsubara and S. Yasukawa, "Development of ceramic ball for molding aggregate", J. JFS, Vol.68, No.7, (1996) 607-611
19 "METHOD OF SULPHUR PRINT TEST FOR STEEL", KSD0226, (2007)
20 W. J. Jackson, "Ghost band in steel castings", The Metals Society, (1983) 426-431
21 K. Tashiro, T. Todoroki and S. Kimura, "Consideration on the solidification and macroscopic segregation of large steel ingot and castings", ISIJ, Vol.57, No.9 (1971) 1479-1499
22 A. Chojecki, I. Telejko and P. Kozelsky, "Influence of calcium on cracking of steel during the welding or casting process", Theo. App. Frac. Mech., 31 (1999) 41-46   DOI   ScienceOn
23 E. T. Turkdogan, S. Lgnatowicz and J. pearson, "The solubility of sulphur in iron and iron manganese alloys", J. of iron and steel Inst., (1955) 349-354
24 H. I. Park, J. T. Kim and S. G. Kim "Morphology and segregation of sulfide inclusions in cast steels (I); A fabrication of Fe-FeS alloys and the observation of their sulfide morphology." J. of the Korean Foundrymen's Society, Vol.29, No.5 (2009) 220-224   과학기술학회마을
25 H. I. Park, J. T. Kim and W. Y. Kim "Morphology and segregation of sulfide inclusions in cast steels (II); Influence of [Mn/S] ratios the morphology of Sulfide Inclusions in Fe-Mn-S Alloys." J. of the Korean Foundrymen's Society, Vol.29, No.6 (2009) 270-276   과학기술학회마을
26 E. T. Turkdogan, "Fundmentals of steelmaking", The institute of materials, (1996) 307