Abstract
The failed collector nozzle holder (CNH) of steel ladle, made of ferrite grade spheroidal graphitic (SG) iron was investigated in the present article. The microstructure, volume fraction, and morphology of spheroidal graphite were investigated. The cause of failure was analyzed through comparative study with a good CNH, using optical and scanning electron microscopy and the data available in various sources in the literature. The effect of microstructure evolution on mechanical properties of the SG iron was analyzed. Failure analysis conducted in this article revealed that the presence of exploded and chunky graphite succeeded the distortion caused by dimensional instability at elevated temperature. The phenomena analyzed were found to be aggravated at higher carbon equivalent, lower residual magnesium, and low yield strength of the sample. The remedial measures were suggested in material and operation guidelines for failure prevention of CNH in steel ladles.
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References
Brent, B., Gene, B., Robert, L.: Microstructure and Dimensional Stability in Si–Mo Ductile Irons for Elevated Temperature Applications, vol. 01, p. 0792. SAE Technical Paper Series. SAE International, Warrendale (2001)
Triantafyllidis, G.K., Antonopoulos, A., Spiliotis, A., Fedonos, S., Repanis, D.: Fracture characteristics of fatigue failure of a vehicle’s ductile, iron steering knuckle. J Fail. Anal. Prev. 9, 323–328 (2009)
Paknikar, S.K.: Prediction of Hardenability in SG iron. Indian Foundry Congress, Chennai (2009)
Angus, H.T.: Cast Iron, Physical and Engineering Properties, 2nd edn, p. 128. BCIRA, Butterworths (1976)
Yanagisawa T.S. Lui, Metallurgical Trans. 16A, 667–673 (1995)
ASM Handbook, vol. 1. Properties and Selection: Irons, Steels, and High Performance Alloys, p. 5. ASM International, Materials Park, OH (1992)
Walton, C.F., Opar, T.J.: Iron Castings Handbook. Iron Castings Society, New York (1981)
Longmuir, P.: Cast Iron Pipe: Manufacture and Properties, with Special Reference to Centrifugal Casting. Charles Griffin & Co., London (1939)
Rajani, B., Kleiner, Y.: Fracture Failure of Large Diameter Cast Iron Water Mains. Water Research Foundation, Denver (2012)
Gilbert, G.N.J.: Tensile properties of cast iron at 269°C. J. Res. Dev. 12(4), 473–478 (1964)
Lin, S.C., Lui, T.S., Chen, L.H.: Effect of nodularity on resonant vibration fracture behavior in upper bainitic and ferritic cast irons. Metall. Mater. Trans. A 31A, 2193–2203 (2000)
Janina, M.R.: Metallography and Microstructures, ASM Handbook, vol. 9. The Foundry Research Institute, Krakow (2004)
Sun, G.X., Loper, C.R., Jr.: Graphite floation in cast iron. AFS Trans. 91, 841–854 (1983)
Chisamera, M., Riposan, I., Barstow, M.: Sulfur inoculation of Mg-treated cast ion-an efficient possibility to obtain compacted graphite cast iron and to improve graphite nucleation ability in ductile iron. AFS Trans. 104, 581–588 (1996)
Kallbom, R., Hamberg, K., Bjorkegren, L.E.: Chunky graphite in ductile iron castings. In: Proceedings of the World Foundry Congress, Harrogate, vol. 184, pp. 1–10 (2006)
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Palai, P., Roy, T.K., Mahashabde, V.V. et al. Failure Analysis of SG Iron Collector Nozzle Holder Used in Steel Ladle. J Fail. Anal. and Preven. 13, 177–182 (2013). https://doi.org/10.1007/s11668-013-9651-z
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DOI: https://doi.org/10.1007/s11668-013-9651-z