Effect of Austempering Time and Temperature on Microstructure and Phase Fraction of Austempered Ductile Irons

Hoang Anh Tuan, Nguyen Duong Nam, Nguyen Tien Dung, Nguyen Huu Dung, Nguyen Hong Hai


This article aims to present the results of studying the influence of austempering time and temperature on the microstructure and phase fraction of Austempered Ductile Irons (ADI). The phase fraction in the ADI affects the alloy properties. The research found the best conditions in terms of phase fraction and mechanical properties: the heat treatment process of this alloy is austenitized at 900°C for 2 hours; quenched and held at 780°C for 2 hours; and then austempered at 360°C for various times ranging from 5 to 120 minutes. At this austempering temperature, the higher the Martensite fraction and the lower ausferrite fraction can be obtained. The content of ferrite remains unchanged at the same holding time. When the austempering time increases from 5 to 120 minutes, the content of martensite decreases gradually, whereas the ausferrite phase increases. The ferrite formed in the 2-phase zone has remained without transformation. In the time interval between 90 to 120 minutes, the stable and high carbon ausferrite can be observed (depending on the heat treatment parameters mentioned above). This time domain is called the process window when % M <5%. The resulting mechanical properties show the effect of microstructure and heat treatment process on properties of this alloy.


Keywords: Austempered Ductile Irons, austempering time, phase fraction, dual matrix.



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GÓRNY M, ANGELLA G, TYRAŁA E, et al. Role of Austenitization Temperature on Structure Homogeneity and Transformation Kinetics in Austempered Ductile Iron. Metals and Materials International, 2019, 25(4): 956-965. https://doi.org/10.1007/s12540-019-00245-y.

KILICLI V, & ERDOGAN M. Effect of ausferrite volume fraction and morphology on tensile properties of partially austenitised and austempered ductile irons with dual matrix structures. International Journal of Cast Metals Research 2007, 20(4): 202-2014. https://doi.org/10.1179/136404607X256051

DONNINI R, FABRIZI A, BONOLLO F, et al. Assessment of the microstructure evolution of an austempered ductile iron during austempering process through strain hardening analysis. Metals and Materials International 2017, 23(5): 855-864. https://doi.org/10.1007/s12540-017-6704-y

ZHANG H, WU Y, LI Q, & HONG X. Mechanical properties and rolling-sliding wear performance of dual phase austempered ductile iron as potential metro wheel material. Wear, 2018, 406-407(April): 156-165. https://doi.org/10.1016/j.wear.2018.04.005

WANG B, BARBER GC, TAO C, et al. Characteristics of tempering response of austempered ductile iron. Journal of Materials Research and Technology, 2018, 7(2): 198-202. https://doi.org/10.1016/j.jmrt.2017.08.011

KIM YJ, SHIN H, PARK H, et al. Investigation into mechanical properties of austempered ductile cast iron (ADI) in accordance with austempering temperature. Materials Letters, 2008, 62(3): 357-360. https://doi.org/10.1016/j.matlet.2007.05.028.

ERIĆ O, JOVANOVIĆ M, ŠIDANIN L, et al. The austempering study of alloyed ductile iron. Materials and Design 2006, 27(7): 617-622. https://doi.org/10.1016/j.matdes.2004.11.028

HEGDE, A., SHARMA, S., & VIKAS SADANAND, R. Mechanical characterization and optimization of heat treatment parameters of manganese alloyed austempered ductile iron. Journal of Mechanical Engineering Science, 2019, 13(1): 4356-4367. https://doi.org/10.15282/jmes.13.1.2019.01.0371

HEGDE, A., SHARMA, S., & SHANKAR M. C. Machinability and related properties of austempered ductile iron: A review. Journal of Mechanical Engineering Science, 2018, 12(4): 4180-4190. https://doi.org/10.15282/jmes.12.4.2018.14.0360

WANG B, BARBER G, SUN X, et al. Characteristics of the Transformation of Retained Austenite in Tempered Austempered Ductile Iron. Journal of Materials Engineering and Performance, 2017, 26(5): 2095-2101. https://doi.org/10.1007/s11665-017-2663-1

KILICLI V. & ERDOGAN M. Effect of ausferrite volume fraction and morphology on tensile properties of partially austenitised and austempered ductile irons with dual matrix structures. International Journal of Cast Metals Research, 2007, 20(4):202-214.

SETHURAM D, SRISAILAM S, & PONANGI BR. Sliding wear and corrosion behaviour of alloyed austempered ductile iron subjected to novel two step austempering treatment. IOP Conference Series: Materials Science and Engineering, 2018, 346(1). https://doi.org/10.1088/1757-899X/346/1/012035

TARAN YN, UZLOV KI, & KUTSOV AY. The bainite reaction kinetics in austempered ductile iron. Journal de Physique IV, 1997, 7(5). https://doi.org/10.1051/jp4:1997568

KILICLI V, & ERDOGAN M. The strain-hardening behavior of partially austenitized and the austempered ductile irons with dual matrix structures. Journal of Materials Engineering and Performance 2008, 17(2): 240-249. https://doi.org/10.1007/s11665-007-9143-y

SELLAMUTHU P, SAMUEL DGH, DINAKARAN D, et al. Austempered ductile iron (ADI): Influence of austempering temperature on microstructure, mechanical andwear properties and energy consumption. Metals (Basel), 2018, 8(1), 53: 1-12. https://doi.org/10.3390/met8010053

SAHIN Y, ERDOGAN M, & KILICLI V. Wear behavior of austempered ductile irons with dual matrix structures. Materials Science and Engineering: A, 2007, 444(1-2): 31-38. https://doi.org/10.1016/j.msea.2006.06.071

DONG BX, QIU F, LI Q, et al. The synthesis, structure, morphology characterizations and evolution mechanisms of nanosized titanium carbides and their further applications. Nanomaterials. 2019, 9(8): 1152. https://doi.org/10.3390/nano9081152

ČATIPOVIĆ N, ŽIVKOVIĆ D, & DADIĆ Z. The effects of molybdenum and manganese on the mechanical properties of austempered ductile iron. Tehnički Vjesnik, 2018, 25(2): 635-642. https://doi.org/10.17559/TV-20170124120729

ŁAWRYNOWICZ, Z. & DYMSKI, S. Analysis of carbon partitioning during ausferritic reaction in ADI. Archives of Foundry Engineering, 2008, 8(3): 69-74.

DAKRE V, PESHWE DR, PATHAK SU, et al. Mechanical Characterization of Austempered Ductile Iron Obtained by Two Step Austempering Process. Transactions of The Indian Institute of Metals 2017, 70(9): 2381-2387. https://doi.org/10.1007/s12666-017-1099-5

BOCCARDO AD, DARDATI PM, GODOY LA. Influence of alloy element distributions on austempered ductile irons. Materials Science and Technology (United Kingdom), 2018, 34(17): 2153-2165. https://doi.org/10.1080/02670836.2018.1521062

CHENG H, FU H, MA S, et al. Effects of austenitizing process on microstructures and properties of carbidic austempered ductile iron. Materials Research Express, 2019, 6(1). https://doi.org/10.1088/2053-1591/aae44c

MOZUMDER YH, BEHERA RK, & SEN S. YH. Influence of Intercritical Austenitizing Temperature, Quenching Media and Tempering Temperature on Mechanical Properties and Wear Behavior of Ductile Iron with Dual Matrix Structure. Orissa Journal of Physics, 2015, 22(1): 39-51.

TYRAŁA E, GÓRNY M, KAWALEC M, et al. Evaluation of volume fraction of austenite in austempering process of austempered ductile iron. Metals (Basel). 2019, 9(8). https://doi.org/10.3390/met9080893

YANG J, & PUTATUNDA SK. Influence of a novel two-step austempering process on the strain-hardening behavior of austempered ductile cast iron (ADI). Materials Science and Engineering: A, 2004, 382(1-2): 265-279. https://doi.org/10.1016/j.msea.2004.04.076

ARANZABAL J, SERRAMOGLIA G, GORIA CA, et al. Development of a new mixed (ferritic-ausferritic) ductile iron for automotive suspension parts. International Journal of Cast Metals Research, 2003, 16(1-3): 185-190, https://doi.org/10.1080/13640461.2003.11819580


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