WEAR RESISTANCE ENHANCEMENT OF PERMANENT MOULDED AUSTEMPERED DUCTILE IRON BY TWO - STEP AUSTEMPERING PROCESS
Keywords:
PMADI, Two-step Austempering Process, WearAbstract
Austempered ductile iron (ADI) has attracted researchers and manufacturers alike mainly because of its immense properties and also at the same time cheaper to process and produce. Utilization of permanent moulds to produce ADI has many advantages such as very good dimensional stability, good nodule size and count, better surface finish and environmental cleanness. Extensive literature survey reported that the influence of novel two-step heat treatment which has resulted in significant improvement in yield and tensile strength and fracture toughness of the material over the conventional single step austempering process. In this investigation, ductile iron test samples were prepared in permanent moulds and are processed by a novel two step austempering process. Test samples were subjected to rubber wheel abrasion test and jet erosion test. The results show that two step austempering process has resulted in significant improvement in the wear resistance (abrasion and erosion). The results are analyzed based on the micro structural features.
Downloads
References
Cast Metals Development Ltd (1992), “Austempered Ductile Iron Castings-Advantages, Productions, Properties and Specifications”, Materials and Design, Vol. 13.
Seetharamu S, Sampathkumaran P, Kumar R, Narasimha Murthy K and Martin Jebraj P (1993), “Abrasion and Erosion Resistance of Permanent Moulded Austempered Ductile Iron”, Wear (167), 1–8.
Kobayashi T, Yamamoto H and Yamada S (1991), “Studies on the Toughness and Fatigue properties of Austempered Ductile Iron Castings”, World conference on ADI, Vol. 21, 256–262.
Leheau C (1986), “Properties of Continuous Cast ADI Bar”, Proceedings of 2nd International Conference on ADI, Univesity of Michigan, 215-226.
Karl – Heinz and Zum Ghar (1976), “How Microstructure Affects the Abrasion Wear Resistance”, Metal Progress, Vol. 116, 46.
Shepperson S and Allenc C (1986), “Austempered Ductile Irons” FWP Journal, Vol. 26 (6).
Eric O, Sidjanin L, Miskovic Z, Zec S and Jovanovic M (2004), “Microstructure and Toughness of Cu Ni Mo Austempered Ductile Iron”, Mater Lett, Vol. 58, 2707-2711.
Bartosiewicz L, Doraiswamy S, Sengupta A and Putatunda S K (1991), “Near Threshold Fatigue Crack Growth behavior of Cast Iron”, Morris Fine Symposium, TMS, Detroit, pp. 135-38.
Janvwak J F and Norton P A (1985), “A Guide to Mechanical Properties by Austempering 1.5%Ni, 0.3% Mo Iron”, AFS Trans, Vol. 88, 123-235.
Putatunda S (2001), “Development of Austempered Ductile Iron with Simultaneous High Yield Strength and Fracture Toughness by Novel Two-step Austempering Process”, Material Science 315, 70-80.
Ayman H, Magahed, Sadek and Abouelela (2008), “Fracture Toughness Characterization of Austempered Ductile Iron Produced Using Both Conventional and Two-step Austempering Processes” International Journal of Material and Design, Vol. 97, 315–20.
Gaston Francucci, Jorge Sikora and Ricardo Dommarco (2008), “Abrasion resistance of Ductile Iron Austempered by Two-step process”, Material Science & Engineering, Vol. 485, 46-54.
Jianjhuai Yang and Susil K Putatunda (2004), “Effect of Microstructure on Abrasion Wear Behaviour of Austempered Ductile Iron Processed by Novel Two-step Austempering Process”, Material Science and Engineering, Vol. 382, 265-279.
