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http://dx.doi.org/10.5762/KAIS.2020.21.9.352

Evaluation of Cooling Process for Marine Shaft Forging Products  

Park, Sang-Chul (Department of Naval Architecture & Ocean Engineering, Koje University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.9, 2020 , pp. 352-357 More about this Journal
Abstract
This study was performed to solve the quality problems of forging propeller shaft components in the marine diesel engines during the final cooling process and provide reasonable guidelines to increase the production of forging products. Residual hydrogen existing on the inside of forging products begins to diffuse and accumulates at the pores, micro-fissures, and grain boundaries as the temperature of forging products begins to decrease and reaches a critical temperature range, and finally transforming into internal defects. These defects were easily found near the surface of products after milling the surface of forging products. In this work, four types of forging products (shaft flange, shaft journal, thrust shaft, and propeller shaft) were chosen to evaluate the temperature history of products during the cooling process, employing non-linear numerical analyses with the ANSYS program. The times elapsed to reach 250 ℃ after cooling were approximately 9 ~ 23 hours for each forging product. These times can be used as cooling process guidelines on the quality and productivity of products after heat treatment.
Keywords
Open Forging; Cooling Process; Temperature; Heat Treatment; Defects; Numerical Analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 S.P.Dudra and Y.T.Im : "Analysis of Void Closure in Open-die Forging", International Journal of Machine Tools and Manufacture, Vol. 30, No. 1, pp. 65-75, 1990. DOI: https://doi.org/10.1016/0890-6955(90)90042-H   DOI
2 M.S.Chun, J.S.Ryu and Y.H.Moon : "FEM Analysis of Void Closure Behavior during Open Die Forging of Rectangular Billets", Transactions of Materials Processing, Vol. 13, No. 2, pp. 148-153, 2004. DOI: http://dx.doi.org/10.5228/KSPP.2004.13.2.148   DOI
3 F.P.Incropera & D.P. De Witt, Introduction to Heat Transfer, John Wiley & Sons Inc., 2007.
4 Internal Technical Report, 2005.
5 Metal Handbook, Vol. 1, 10th Edition, ASM, 1990.
6 S.C.Chu and S.S.Lian : "Numerical Analysis of Temperature Distribution of Plasma Arc with Molten Pool in Plasma Arc Melting", Computational Materials Science, Vol. 30, pp. 441-447, 2004. DOI: http://dx.doi.org/10.1016/j.commatsci.2004.03.014   DOI
7 ANSYS Users' Manual, Version 8.1, 2007.
8 B.Y.Lee, M.H.Im and J.Y.Shon : "Temperature Distribution and Thermal Stress Analysis of a Large LPLi Engine Piston", Journal of the Korean Society of Marine Engineers, Vol. 28, No. 3, pp. 538-550, 2004.
9 T.W.Lim and D.H.Cho : "Study on Heat Transfer Characteristic of Shell-and-Tube Heat Exchanger with Plate Fin", Journal of the Korea Academia-Industrial Cooperation Society, Vol. 10, No. 1, pp. 46-51, 2009. DOI: http://dx.doi.org/10.5762/KAIS.2009.10.1.046   DOI
10 J.U.Cho and M.S.Han : "Study on Thermal Stress and Flow Analysis at Exhaust Manifold of Car", Transactions of KSAE, Vol. 22, No. 2, pp. 23-28, 2014. DOI: http://dx.doi.org/10.7467/ksae.2014.22.2.023