Abstract
For decades, researchers have been concerned about the formability of manufactured wrought cast iron, with brittleness being a major issue in these alloys. To address this, the ferrite phase has been identified as a suitable matrix for cast iron deformation due to its ability to provide satisfactory ductility and avoid brittle limitations. In this study, machined parts of ductile cast iron were subjected to an annealing process at approximately 900°C for 1 h before undergoing hot plastic deformation with varying degrees of reduction. The deformation was carried out using a cylinder-covered hot compression (CCC or CCHC) technique. The primary objective of this study is to gain a microscopic understanding of hot plastically deformed ductile cast iron and propose a mathematically formulated flow strain that takes into account the contributions of the microstructure’s constituent phases. This analysis aims to provide a comprehensive characterization of deformed graphite within the microstructure. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to obtain results for the characterization. The findings revealed that as the reduction increased, spheroidal graphite tended to transform into a lamellar structure, resulting in diverse properties. Additionally, a microhardness test was conducted to assess the variation in mechanical properties throughout each deformation step.
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REFERENCES
J. G. Lenard and M. E. Davies, “An experimental study of heat transfer in metal-forming processes,” CIRP Ann. 41, 307–310 (1992). https://doi.org/10.1016/s0007-8506(07)61210-4
Y. Estrin and A. Vinogradov, “Extreme grain refinement by severe plastic deformation: A wealth of challenging science,” Acta Mater. 61, 782–817 (2013). https://doi.org/10.1016/j.actamat.2012.10.038
S. V. Divinski, K. A. Padmanabhan, and G. Wilde, “Microstructure evolution during severe plastic deformation,” Philos. Mag. 91, 4574–4593 (2011). https://doi.org/10.1080/14786435.2011.615349
A. Azushima, R. Kopp, A. Korhonen, D. Y. Yang, F. Micari, G. D. Lahoti, P. Groche, J. Yanagimoto, N. Tsuji, A. Rosochowski, and A. Yanagida, “Severe plastic deformation (SPD) processes for metals,” CIRP Ann. 57, 716–735 (2008). https://doi.org/10.1016/j.cirp.2008.09.005
“Census of World Casting Production: Global Casting Production Growth Stalls,” Mod. Casting Mag. 109, 24–25 (2019).
“Census of World Casting Production: Global Casting Production Growth Stalls,” Mod. Casting Mag. 109, 26–27 (2019).
J. Shi, S. Zou, and R. W. Smith, “Effect of elongated graphite on mechanical properties of hot-rolled ductile iron,” JMEP 3, 657–663 (1994). https://doi.org/10.4236/msa.2019.106032
Z. R. He, G. X. Lin, and S. Ji, “Deformation and fracture of cast iron with an optimized microstructure,” Mater. Charact. 38, 251–258 (1997). https://doi.org/10.1016/s1044-5803(97)00080-6
T. El-Bitar and E. El-Banna, “Contribution of forming parameters on the properties of hot rolled ductile cast iron alloys,” Mater. Lett. 31, 145–150 (1997). https://doi.org/10.1016/s0167-577x(96)00254-6
V. Di Cocco, F. Lacoviello, and M. Cavallini, “Damaging micromechanisms characterization of a ferritic ductile cast iron,” Eng. Fract. Mech. 77, 2016–2023 (2010). https://doi.org/10.1016/j.engfracmech.2010.03.037
J. A. Rehder, “Specification for wrought iron rolled or forged blooms and forgings,” Iron Age 168, 229–233 (1951). https://doi.org/10.1520/a0073-66
M. Soliman, A. Nofal, and H. Palkowski, “Alloy and process design of thermo-mechanically processed multiphase ductile iron,” Mater. Des. 87, 450–465 (2015). https://doi.org/10.1016/j.matdes.2015.07.159
T. Sakai, A. Belyakov, R. Kaibyshev, H. Miura, and J. J. Jonas, “Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions,” Prog. Mater. Sci. 60, 130–207 (2014). https://doi.org/10.1016/j.pmatsci.2013.09.002
H. J. Mcqueen, “Development of dynamic recrystallization theory,” Mater. Sci. Eng., A 387-389, 203–208 (2014). https://doi.org/10.1016/j.msea.2004.01.064
K. C. Le and D. M. Kochmann, “A simple model for dynamic recrystallization during severe plastic deformation,” Arch. Appl. Mech. 79, 579–586 (2009). https://doi.org/10.1007/s00419-008-0280-z
E. Bagherpour, N. Pardis, M. Reihanian, and R. Ebrahimi, “An overview on severe plastic deformation: Research status, techniques classification, microstructure evolution, and applications,” Int. J. Adv. Manuf. Technol. 100, 1647–1694 (2019). https://doi.org/10.1007/s00170-018-2652-z
M. Faisal, E. El-Shenawy, and M. A. Taha, “Effect of deformation parameters on microstructural evolution of GGG 40 spheroidal graphite cast iron alloy,” Mater. Sci. Appl. 10, 433–450 (2019). https://doi.org/10.4236/msa.2019.106032
I. Hervas, M. B. Bettaieb, A. Thuault, and E. Hug, “Graphite nodule morphology as an indicator of the local complex strain state in ductile cast iron,” Mater. Des. 52, 524–532 (2013). https://doi.org/10.1016/j.matdes.2013.05.078
I. Hervas, A. Thuault, and E. Hug, “Damage analysis of a ferritic SiMo ductile cast iron submitted to tension and compression loadings in temperature,” Metals 5, 2351–2369 (2019). https://doi.org/10.3390/met5042351
X. Zhao, X. Yang, and T. Jing, “Processing maps for use in hot working of ductile iron,” J. Iron Steel Res. Int. 18 (4), 48–51 (2011). https://doi.org/10.1016/s1006-706x(11)60049-6
K. Qi, F. Yu, F. Bai, Z. Yan, Z. Wang, and T. Li, “Research on the hot deformation behavior and graphite morphology of spheroidal graphite cast iron at high strain rate,” Mater. Des. 30, 4511–4515 (2009). https://doi.org/10.1016/j.matdes.2009.05.019
X. Zhao, T. F. Jing, Y. W. Gao, J. F. Zhou, and W. Wang, “A new SPD process for spheroidal cast iron,” Mater. Lett. 58, 2335–2339 (2004). https://doi.org/10.1016/j.matlet.2004.01.034
X. Zhao, J. Wang, and T. Jing, “Gray cast iron with directional graphite flakes produced by cylinder covered compression process,” J. Iron Steel Res. Int. 14 (5), 52–55 (2007). https://doi.org/10.1016/s1006-706x(07)60074-0
W. Wei, T. Jing, Y. Gao, G. Qiao, and X. Zhao, “Properties of a gray cast iron with oriented graphite flakes,” J. Mater. Process. Technol. 182, 593–597 (2007). https://doi.org/10.1016/j.jmatprotec.2006.09.028
A. Ghahremaninezhad and K. Ravi-Chandar, “Deformation and failure in nodular cast iron,” Acta Mater. 60, 2359–2368 (2012). https://doi.org/10.1016/j.actamat.2011.12.037
ASTM E351, Standard Test Methods for Chemical Analysis of Cast Iron-All Types. https://doi.org/10.1520/e0351-18
ASTM A536, Standard Specification for Ductile Iron Castings. https://doi.org/10.1520/a0536-84r19e01
N. Haghdadi, B. Bazaz, H. R. Erfanian-Naziftoosi, and A. R. Kiani-Rashid, “Microstructural and mechanical characteristics of Al-alloyed ductile iron upon casting and annealing,” Int. J. Miner., Metall., Mater. 19, 812–820 (2012). https://doi.org/10.1007/s12613-012-0633-z
A. Shayesteh-Zeraati, H. Naser-Zoshki, and A. R. Kiani-Rashid, “Microstructural and mechanical properties (hardness) investigations of Al-alloyed ductile cast iron,” J. Alloys Compd. 500, 129–133 (2010). https://doi.org/10.1016/j.jallcom.2010.04.003
J. L. Dossett and C. V. White, “Introduction to cast iron heat treatment,” in Heat Treating of Irons and Steels, Ed. by J. L. Dossett and G. E. Totten, ASM Handbook, Vol. 4D (ASM International, 2014), pp. 483–492. https://doi.org/10.31399/asm.hb.v04d.a0005945
ASTM E3, Standard Guide for Preparation of Metallographic Specimens. https://doi.org/10.1520/e0003-11r17
ASTM A247, Standard Test Method for Evaluating the Microstructure of Graphite in Iron Castings. https://doi.org/10.1520/a0247-19
ASTM E92, Standard Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials. https://doi.org/10.1520/e0092-16
ASTM E384, Standard Test Method for Microindentation Hardness of Materials. https://doi.org/10.1520/e0384-99
A. S. Chaus, J. Sojka, and A. I. Pokrovskii, “Effect of hot plastic deformation on microstructural changes in cast iron with globular graphite,” Phys. Met. Metallogr. 114, 85–94 (2013). https://doi.org/10.1134/s0031918x13010031
N. Bonora and A. Ruggiero, “Micromechanical modeling of ductile cast iron incorporating damage. Part I: Ferritic ductile cast iron,” Int. J. Solids Struct. 42, 1401–1424 (2005). https://doi.org/10.1016/j.ijsolstr.2004.07.025
X. Zhao and T.-F. Jing, “Effect of sandwich structure on mechanical properties of gray cast iron plates,” in Advanced Design and Manufacture to Gain a Competitive Edge, Ed. by X. T. Yan, C. Jiang, and B. Eynard (Springer, London, 2008), pp. 241–247. https://doi.org/10.1007/978-1-84800-241-8_26
J. Bača and A. S. Chaus, “Effect of plastic deformation on the structure and properties of cast iron with globular graphite,” Met. Sci. Heat Treat. 46, 188–191 (2004). https://doi.org/10.1023/b:msat.0000043098.43295.94
S. Balos and L. Sidjanin, “Microdeformation of soft particles in metal matrix composites,” J. Mater. Process. Technol. 209, 482–487 (2009). https://doi.org/10.1016/j.jmatprotec.2008.02.015
P. Rubin, R. Larker, E. Navara, and M. Antti, “Graphite formation and dissolution in ductile irons and steels having high silicon contents: Solid-state transformations,” Metallogr., Microstructure, Anal. 7, 587–595 (2018). https://doi.org/10.1007/s13632-018-0478-6
D. R. Askeland and N. Birer, “Secondary graphite formation in tempered nodular cast iron weldments,” Weld. J. 58, 337–341 (1979).
R. Ruxanda and D. M. Stefanescu, “Graphite shape characterisation in cast iron—From visual estimation to fractal dimension,” Int. J. Cast Met. Res. 14, 207–216 (2002). https://doi.org/10.1080/13640461.2002.11819439
J. Shi, M. Ghoreshy, R. W. Smith, and J. J. M. Too, “The use of spheroidal graphite cast irons to develop forgeability criteria based on local strain measurements,” J. Eng. Mater. Technol. 111, 26–31 (1989). https://doi.org/10.1115/1.3226429
J. Shi, M. A. Savas, B. J. Yang, and R. W. Smith, “Spheroidal graphite ferritic cast iron—An ideal model material to examine the deformation a single phase matrix containing soft-spheroidal inclusions,” Int. J. Cast Met. Res. 16, 215–220 (2003). https://doi.org/10.1080/13640461.2003.11819585
ASTM E2567, Standard Test Method for Determining Nodularity and Nodule Count in Ductile Iron Using Image Analysis. https://doi.org/10.1520/e2567-16a
Z. Wang, X. Zhang, F. Xu, K. Qian, and K. Chen, “Effect of nodularity on mechanical properties and fracture of ferritic spheroidal graphite iron,” China Foundry 16, 386–392 (2019). https://doi.org/10.1007/s41230-019-9080-z
D. Agnoletto, G. V. B. Lemos, A. B. Beskow, C. R. D. L. Lessa, and A. Reguly, “Methodology for determination of degree of nodularity in a ductile cast iron GGG 40 by ultrasonic velocity test,” South. Braz. J. Chem. 26 (26), 10–16 (2018). https://doi.org/10.48141/sbjchem.v26.n26.2018.15_2018.pdf
J. Bahadori-Fallah, M. H. Farshidi, and A. R. Kiani-Rashid, “Equal channel angular pressing of spheroidal graphite cast iron,” Mater. Res. Express 6, 066542 (2019). https://doi.org/10.1088/2053-1591/ab0dcf
J. D. Eshelby, “The determination of the elastic field of an ellipsoidal inclusion, and related problems,” Proc. R. Soc. London, Ser. A: Math. Phys. Sci. 241 (1226), 376–396 (1957). https://doi.org/10.1098/rspa.1957.0133
J. D. Eshelby, “The elastic field outside an ellipsoidal inclusion,” Proc. R. Soc. London. Ser. A. Math. Phys. Sci. 252 (1271), 561–569 (1959). https://doi.org/10.1098/rspa.1959.0173
J. D. Eshelby, “Elastic inclusions and inhomogeneities,” Prog. Solid Mech. 2, 89–140 (1961).
M. Lukhi, M. Kuna, and G. Hütter, “Micromechanical simulation of fatigue in nodular cast iron under stress-controlled loading,” Mater. Des. Process. Commun. 3, e214 (2020). https://doi.org/10.1002/mdp2.214
Y. B. Zhang, T. Andriollo, S. Fæster, R. Barabash, R. Xu, N. Tiedje, J. Thorborg, J. Hattel, D. Juul Jensen, and N. Hansen, “Microstructure and residual elastic strain at graphite nodules in ductile cast iron analyzed by synchrotron X-ray microdiffraction,” Acta Mater. 167, 221–230 (2019). https://doi.org/10.1016/j.actamat.2019.01.038
M. Mendas, S. Benayoun, M. H. Miloud, and I. Zidane, “Microhardness model based on geometrically necessary dislocations for heterogeneous material,” J. Mater. Res. Technol. 15, 2792–2801 (2021). https://doi.org/10.1016/j.jmrt.2021.09.093
T. Andriollo, K. Hellström, M. R. Sonne, J. Thorborg, N. Tiedje, and J. Hattel, “Uncovering the local inelastic interactions during manufacture of ductile cast iron: How the substructure of the graphite particles can induce residual stress concentrations in the matrix,” J. Mech. Phys. Solids 111, 333–357 (2018). https://doi.org/10.1016/j.jmps.2017.11.005
T. Andriollo, S. Fæster, and G. Winther, “Probing the structure and mechanical properties of the graphite nodules in ductile cast irons via nano-indentation,” Mech. Mater. 122, 85–95 (2018). https://doi.org/10.1016/j.mechmat.2018.03.010
H. Gao, Y. Hang, W. D. Nix, and J. W. Hutchinson, “Mechanism-based strain gradient plasticity? I. Theory,” J. Mech. Phys. Solids 47, 1239–1263 (1999). https://doi.org/10.1016/s0022-5096(98)00103-3
Y. B. Zhang, T. Andriollo, S. Fæster, R. Barabash, R. Xu, N. Tiedje, J. Thorborg, J. Hattel, D. Juul Jensen, and N. Hansen, “Microstructure and residual elastic strain at graphite nodules in ductile cast iron analyzed by synchrotron X-ray microdiffraction,” Acta Mater. 167, 221–230 (2019). https://doi.org/10.1016/j.actamat.2019.01.038
N. A. Fleck, M. F. Ashby, and J. W. Hutchinson, “The role of geometrically necessary dislocations in giving material strengthening,” Scr. Mater. 48, 179–183 (2003). https://doi.org/10.1016/s1359-6462(02)00338-x
ACKNOWLEDGMENTS
The authors would like to thank the Faculty of Engineering of Ferdowsi University in Mashhad for supporting the implementation of this study. The first author is also incredibly grateful to Prof. Hao Chen for his friendly helping attitude and comments. The first author also thanks Radfarman Company and its staff (Mr. Masoumi, Mr. Tabesh, and Mr. Ramesh) for supporting laboratory services.
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This work was supported by ongoing university funding. No additional grants to carry out or direct this particular research were obtained.
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Kaboli-Mallak, S.K., Kheirkhahan, N., Edalati, E. et al. On the Morphology Variation of Graphite in Ductile Cast Iron through Severe Plastic Deformation. Phys. Metals Metallogr. 124, 1813–1825 (2023). https://doi.org/10.1134/S0031918X23601312
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DOI: https://doi.org/10.1134/S0031918X23601312