Abstract
The effect of the austenitization route on the bainitic reaction kinetics of an alloyed (3.2C–2.8Si–1.8Ni–1.4Cu–0.4Mn–0.2Mo–0.1Cr) austempered ductile iron was studied. Two-step, conventional and rapid austenitization heat treatments were employed to produce different austenite grains sizes (94, 39, and 15 μm, respectively) and, in one case, secondary graphite precipitation. The overall bainitic transformation kinetic at 350 °C was described using the Johnson-Mehl-Avrami-Kolmogorov equation, and the values of the Avrami's adjustable parameters were discussed. The austempering reaction of the coarser austenite microstructure with secondary graphite precipitation featured the fastest kinetics, while the one derived from the medium austenite grain showed the slowest reaction rate. The increase in the graphite/austenite interfacial area reduced the half-transformation time (t50-value) by one magnitude compared to the austenite grain boundary area. The austempered samples from the rapid austenitization route comparatively featured the best tensile properties and the highest ISO and ASTM standards grades despite the considerable proportion of grain boundary allotriomorphic ferrite.
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References
T. Watmough, M.J. Malatesta, Strengthening of ductile iron for crankshaft applications. Trans. Am. Foundrymen’s Soc. 92, 83–99 (1984)
R.C. Voigt, Austempered ductile iron-processing and properties. Cast Metals 2(2), 71–93 (1989). https://doi.org/10.1080/09534962.1989.11818986
J. Liu, R. Elliott, The influence of cast structure on the austempering of ductile iron. Int. J. Cast Met. Res. 11(5), 407–412 (1999). https://doi.org/10.1080/13640461.1999.11819308
Yazdani S, Elliott R (1999) Influence of molybdenum on austempering behaviour of ductile iron Part austempering kinetics and mechanical properties of ductile iron containing. Materials Science and Technology. 15(5) 531–540 https://doi.org/10.1080/13640461.2002.11819471
A. Basso, J. Sikora, Review on production processes and mechanical properties of dual phase austempered ductile iron. Int. J. Metalcast. 6, 7–14 (2012). https://doi.org/10.1007/BF03355473
S. Méndez et al., Advanced properties of ausferritic ductile iron obtained in as-cast conditions. Int. J. Metalcast. 11, 116–122 (2017). https://doi.org/10.1007/s40962-016-0092-9
G. Artola, I. Gallastegi, J. Izaga, M. Barreña, A. Rimmer, Austempered ductile Iron (ADI) alternative material for high-performance applications. Int. J. Metalcast. 11, 131–135 (2017). https://doi.org/10.1007/s40962-016-0085-8
F. Zanardi et al., A contribution to new material standards for ductile irons and austempered ductile irons. Int. J. Metalcast. 11, 136–147 (2017). https://doi.org/10.1007/s40962-016-0095-6
J.O. Olawale et al., Forced-air cooling quenching: a novel technique for austempered ductile iron production. Int. J. Metalcast. 11, 568–580 (2017). https://doi.org/10.1007/s40962-016-0114-7
W.L. Guesser, C.L. Lopes, P.A.N. Bernardini, Austempered ductile iron with dual microstructures: effect of initial microstructure on the austenitizing process. Int. J. Metalcast. 14, 717–727 (2020). https://doi.org/10.1007/s40962-019-00397-y
M. Soliman, A. Nofal, H. Palkowski, Effect of thermo-mechanical processing on structure and properties of dual-phase matrix ADI with different Si-contents. Int. J. Metalcast. 14, 853–860 (2020). https://doi.org/10.1007/s40962-020-00477-4
C. Hartung et al., Research on solution strengthened ferritic ductile iron structure and properties using different treatment and inoculation materials. Int. J. Metalcast. 14, 1195–1209 (2020). https://doi.org/10.1007/s40962-020-00469-4
F. Zanardi, C. Mapelli, S. Barella, Reclassification of spheroidal graphite ductile cast irons grades according to design needs. Int. J. Metalcast. 14, 622–655 (2020). https://doi.org/10.1007/s40962-020-00454-x
ASTM International. A897/A897M-15 Standard Specification for Austempered Ductile Iron Castings. West Conshohocken, PA; ASTM International, 2015. . https://doi-org.ez67.periodicos.capes.gov.br/10.1520/A0897_A0897M-15
ISO Standard. ISO 17804:2005. Founding — Ausferritic spheroidal graphite cast irons – Classification. International Organization for Standardization, Geneva, Switzerland, 2005. https://www.iso.org/obp/ui/#iso:std:iso:17804:ed-1:v1:en
Cambridge Engineering Selector Software, 2019. Austempered ductile cast iron (ADI). Level 3 Database
H.K.D.H. Bhadeshia, D.V. Edmonds, The bainite transformation in a silicon steel. Metallurgical and Mater. Trans. A 10(7), 895–907 (1979). https://doi.org/10.1007/BF02658309
B.P.J. Sandvik, The Bainite reaction in Fe-Si-C Alloys: The primary stage. Metallurgical and Mater. Trans. A 13(5), 777–787 (1982). https://doi.org/10.1007/BF02642391
H. K. D. H. Bhadeshia. Bainite in steels. Third edition, Maney Publishing, Wakefield, UK, 589 pages (2015). https://www.phase-trans.msm.cam.ac.uk/2018/Bainite_3.pdf
D.V. Edmonds, R.C. Cochrane, Structure-property relationships in bainitic steels. Metallurgical and Materials Transactions A 21(6), 1527–1540 (1990). https://doi.org/10.1007/BF02672567
H.B. Aanon, H.I. Aaronson, Altering the time cycle of heat treatment by controlling grain boundary and subboundary structure. Metallurgical and Materials Transactions 2(1), 23–39 (1971). https://doi.org/10.1007/BF02662635
C.R.F. Azevedo, A.A. Garboggini, A.P. Tschiptschin, Effect of austenite grain refinement on morphology of product of bainitic reaction in austempered ductile iron. Mater. Sci. Technol. 9(8), 705–710 (1993). https://doi.org/10.1179/mst.1993.9.8.705
R. A. Grange, E. R. Shackelford. Method of Producing Ultrafine Grained Steel. U.S. Pat. 3,178,324, 1965; assigned to U.S. Steel Corp. https://patentimages.storage.googleapis.com/c9/f7/5c/539395d255700f/US3178324.pdf
C.A. Apple, G. Krauss Jr., The effect of heating rate on the martensite to austenite transformation in Fe-Ni-C alloys. Acta Metall. 20(7), 849–856 (1972). https://doi.org/10.1016/0001-6160(72)90077-6
G. Krauss Jr., Fine structure of austenite produced by the reverse martensitic transformation. Acta Metall. 11(11), 499–509 (1963). https://doi.org/10.1016/0001-6160(63)90085-3
R.A. Grange, The rapid heat treatment of steel. Metallurgical and Materials Transactions A 22(1), 65–78 (1991). https://doi.org/10.1007/BF02662639
R.A. Grange, Strengthening steel by austenite grain refinement. Trans. ASM 59(1), 27–48 (1966)
N.C. Law, D.V. Edmonds, The formation of austenite in a low-alloy steel. Metallurgical and Materials Transactions A 11(1), 33–46 (1980). https://doi.org/10.1007/BF02700436
K.M. Ibrahim, Properties of ausformed austempered ductile iron (AADI) containing Ni. Int. J. Cast Met. Res. 18(5), 309–314 (2005). https://doi.org/10.1179/136404605225023045
H. Nasr El-Din, A.A. Nofal, K.M. Ibrahim, A.A. Ramadan, Ausforming of austempered ductile iron alloyed with nickel. Int. J. Cast Met. Res. 19(3), 137–150 (2006). https://doi.org/10.1179/136404606225023381
A.A. Nofal, H. Nasr El-din, M.M. Ibrahim, Thermomechanical treatment of austempered ductile iron. Int. J. Cast Metals Res. 20(2), 47–52 (2007). https://doi.org/10.1179/136404607X216613
S. Panneerselvam, S. K. Putatunda (2018). Processing of Nanostructured Austempered Ductile Cast Iron ADI by a Novel Method. International Journal of Metallurgy and Metal Physics, 3(2) 11. https://doi.org/10.35840/2631-5076/9220
V. Kilicli, M. Erdogan, Tensile properties of partially austenitised and austempered ductile irons with dual matrix structures. Mater. Sci. Technol. 22(8), 919–928 (2006). https://doi.org/10.1179/174328406X102390
S.K. Putatunda, Development of austempered ductile cast iron (ADI) with simultaneous high yield strength and fracture toughness by a novel two-step austempering process. Mater. Sci. Eng. A 315(1–2), 70–80 (2001). https://doi.org/10.1016/S0921-5093(01)01210-2
H. Santos, A. Duarte, J. Seabra, Austempered ductile iron with tempered martensite. Int. J. Cast Met. Res. 15(2), 117–124 (2002). https://doi.org/10.1080/13640461.2002.11819470
J. Yang, S.K. Putatunda, Influence of a novel two-step austempering process on the strain-hardening behavior of austempered ductile cast iron (ADI). Mater. Sci. Eng. A 382(1–2), 265–279 (2004). https://doi.org/10.1016/j.msea.2004.04.076
P. Rubin, R. Larker, E. Navara, M.-L. Antti, Graphite Formation and Dissolution in Ductile Irons and Steels Having High Silicon Contents: Solid-State Transformations. Metallography, Microstructure, and Analysis 7, 587–595 (2018). https://doi.org/10.1007/s13632-018-0478-6
J. Liu, R. Elliott, The influence of cast structure on the austempering of ductile iron. Part 3. The role of nodule count on the kinetics, microstructure and mechanical properties of austempered Mn alloyed ductile iron. Int. J. Cast Met. Res. 12(3), 189–195 (1999). https://doi.org/10.1080/13640461.1999.11819356
Y. Osafune, M. Yuyama, Microstructure and properties of austempered ductile cast iron with refined graphite nodules. Int. J. Cast Met. Res. 21(1–4), 90–95 (2008). https://doi.org/10.1179/136404608X361738
D.R. Askeland, F. Farinez, Factors Affecting the Formation of Secondary Graphite in Quenched and Tempered Ductile Iron. AFS Trans. 87, 99–106 (1979)
S.A. Rounaghi, P. Shayesteh, A.R. Kiani-Rashid, Microstructural study in graphitised hypereutectoid cast and commercial steels. Mater. Sci. Technol. 27, 631–636 (2011). https://doi.org/10.1179/026708310X520493
A. S. O. Pimentel, Grafitização secundária em ferro fundido cinzento. MSc dissertati on, Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/tede/tede/1682
J. Vatavuk, A. Sinatora, H. Goldenstein, E. Albertin, R. Fuoco. Factors affecting ductile-brittle transition of ferritic spheroidal graphite cast iron. XXII International Metallurgy Congress, Bologna, Italy, Proceedings, Part II, 1563-1575 (1988). https://www.researchgate.net/publication/273439418_Factors_Affecting_Ductile-brittle_Transition_of_Ferritic_Spheroidal_Graphite_Cast_Iron
T. Skaland, Ø. Grong, T. Grong. A model for the graphite formation in ductile cast iron: Part II. Solid state transformation reactions. Metallurgical and Materials Transactions A, 24 2347–53 (1993). https://link.springer.com/content/pdf/10.1007%2FBF02648606.pdf
K. Hayrynen. Heat Treatment of Ductile Iron. ASM International, 1A 256-269 (2017). https://doi.org/10.31399/asm.hb.v01a.a0006322.
H. Berns, W. Theisen, Ferrous Materials (Springer-Verlag, Berlin Heidelberg, 2008), p. 417
L.C.D. Fielding, The Bainite Controversy. Mater. Sci. Technol. 29(4), 383–399 (2013). https://doi.org/10.1179/1743284712Y.0000000157
J.G. Zhu, X. Sun, G.C. Barber, X. Han, H. Qin, Bainite Transformation-Kinetics-Microstructure Characterization of Austempered 4140 Steel. Metals 10(2), 236 (2020). https://doi.org/10.3390/met10020236
M. Avrami, Kinetics of phase change. I. General theory. J. Chem. Phy. 7, 1103–1132 (1939). https://doi.org/10.1063/1.1750380
J.R.C. Guimarães, P.R. Rios, A.L.M. Alves, An Alternative to Avrami Equation. Mater. Res. 22(5), e 20190369 8 (2019). https://doi.org/10.1590/1980-5373-MR-2019-0369
M.J. Starink, Kinetic equations for diffusion-controlled precipitation reactions. J. Mater. Sci. 32, 4061–4070 (1997). https://doi.org/10.1023/A:1018649823542
C.R.F. Azevedo. Effect of austenite grain size on the morphology and kinetics of the bainitic reaction of an austempered ductile iron. MSc Dissertation. The University of São Paulo, 1991 (in Portuguese). https://teses.usp.br/teses/disponiveis/3/3133/tde-11102007-165928/publico/mestrado.pdf
D.R. Barraclough, Etching of prior austenite grain boundaries in martensite. Metallography 6(6), 465–472 (1973). https://doi.org/10.1016/0026-0800(73)90044-X
P.R. Krahe, M. Desnouses, Revealing the Former Austenite Grain Boundaries of High-Purity Iron Carbon Alloys. Metallography 4(2), 171–175 (1971). https://doi.org/10.1016/0026-0800(71)90027-9
V.L. Viswanathan, A new etchant to reveal prior austenite grain boundaries in martensitic stainless steels. Metallography 10(3), 291–297 (1977). https://doi.org/10.1016/0026-0800(77)90032-5
R. Riedl, A suggestion for the consistent determination of austenite grain size. Practic. Metall. 15(11), 537–541 (1978)
R. Riedl, The determination of austenite grain size of cast-iron. Practic. Metall. 16(12), 570–577 (1979)
R. Riedl, The determination of austenite grain size in ferrous alloys. Metallography 14(2), 119–28 (1981). https://doi.org/10.1016/0026-0800(81)90036-7
ASM Handbook Volume 8: Metallography, Structures and Phase Diagrams. Edited by T. Lyman. 8th Edition. Metal Park, Ohio, American Society for Metals, 1970
ASTM International. E562-19 Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count. West Conshohocken, PA; ASTM International, 2015. https://doi.org/10.1520/E0562-19
J. Damon, F. Mühl, S. Dietrich, V. Schulze, A Comparative Study of Kinetic Models Regarding Bainitic Transformation Behavior in Carburized Case Hardening Steel 20MnCr5. Metall. Mater. Trans. A 50, 104–117 (2019). https://doi.org/10.1007/s11661-018-5004-6
K.M. Pedersen, N.S. Tiedje, Graphite nodule count and size distribution in thin-walled ductile cast iron. Mater. Charact. 59(8), 1111–1121 (2008). https://doi.org/10.1016/j.matchar.2007.09.001
J. W. Christian. The Theory of Polycrystalline Aggregates. In: The Theory of Transformations in Metals and Alloys, Chapter 8. 3rd Edition, Pergamon pp. 327- 377 (2002)
M.M. Cisneros G, M.J. Pérez L, R.E. Campos C, E. Valdés C, The role of Cu, Mo and Ni on the kinetics of the bainitic reaction during the austempering of ductile irons. Int. J. Cast Met. Res. 11(5), 425–430 (1999). https://doi.org/10.1080/13640461.1999.11819311
C. Suchocki, D. Myszka, K. Wasiluk. Transformation Kinetics of Austempered Ductile Iron: Dilatometric Experiments and Model Parameter Evaluation. Archives of Metallurgy and Materials, 64 (4) 1661-1666 (2019). https://doi.org/10.24425/amm.2019.130141.
A. Matsuzaki, H.K.D.H. Bhadeshia, Effect of austenite grain size and bainite morphology on overall kinetics of bainite transformation in steels. Mater. Sci. Technol. 15(5), 518–522 (1999). https://doi.org/10.1179/026708399101506210
I.A. Yakubtsov, G.R. Purdy, Analyses of Transformation Kinetics of Carbide-Free Bainite Above and Below the Athermal Martensite-Start Temperature. Metall Mater Trans A 43, 437–446 (2012). https://doi.org/10.1007/s11661-011-0911-9
A.A. Kuklina, M.V. Maisuradze, Y.V. Yudin, Analytical Description of the Bainite Transformation Kinetics in Steels 300M and D6AC. Mater. Sci. Forum 907, 31–37 (2017). https://doi.org/10.4028/www.scientific.net/MSF.907.31
J. Achary, D. Venugopalan, Microstructural development and austempering kinetics of ductile iron during thermomechanical processing. Metallurgical Mater. Trans. A 31, 2575–2585 (2000). https://doi.org/10.1007/s11661-000-0202-3
A.D. Boccardo, P.M. Dardati, D.J. Celentano, L.A. Goday, A microscale model for ausferritic transformation of austempered ductile irons. Metallurgical Mater. Trans. A 48, 524–535 (2017). https://doi.org/10.1007/s11661-016-3816-9
S.-M. Yoo, K. Moeinipour, A. Ludwig, P.R. Sahm, Numerical simulation and experimental results of in situ heat treated austempered ductile Iron. Int. J. Cast Met. Res. 11(6), 483–488 (1999). https://doi.org/10.1080/13640461.1999.11819321
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The authors would like to thank the support of the Institute for the Technological Research of the State of São Paulo (IPT), especially Dr. R. Fuoco, Dr. E. Albertin, and Mrs. L. Casciny. Additionally, Prof. Cesar R. F. Azevedo would like to thank the Brazilian National Council for Scientific and Technological Development (CNPq) for his research grant (Process: 302077/2016-2).
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Pereira, H.B., Tschiptschin, A.P., Goldenstein, H. et al. Effect of the Austenitization Route on the Bainitic Reaction Kinetics and Tensile Properties of an Alloyed Austempered Ductile Iron. Inter Metalcast 15, 1442–1455 (2021). https://doi.org/10.1007/s40962-020-00569-1
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DOI: https://doi.org/10.1007/s40962-020-00569-1