Tribological Behaviour of Si-Cu-Mo-Ni Alloyed Austempered Ductile Iron

Authors: Rajendra M. Galagali, R. G. Tikotkar

Abstract:

Ductile iron samples alloyed with 2.5% Si, 0.78% Cu, 0.421% Mo and 0.151% Ni were austempered at 345 °C and 380 °C for 150 and 180 mins and then tested for wear strength. Ductile iron was also included in the study for comparison purposes. A pin-on-disc machine was employed for wear study. The investigations were carried out for a speed of 3 m/s, under the contact load of 29.43 N with varying sliding distances ranging from 1000 m to 5000 m. The experimental outcome indicates that ADI austempered at 345 °C is more wear resistant than the one austempered at 380 °C. Also for only a sliding distance of 3000 m, both exhibited almost same wear resistance. SEM analysis indicates running sliding marks more or less parallel to one another. Spalled layers and large voids which resemble delamination were observed on worn surface of ADI380. This indicated the occurrence of severe wear. Dark patches observed indicate oxidized surface.

Keywords: Austempered ductile iron, coefficient of friction, dry sliding wear, sliding distance.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131788

References:

[1] ASM Handbook, “Properties and Selection: Irons, Steels and High Performance Alloys”, vol. 1, 1990.
[2] B. V. Kovacs, “Austempered ductile iron: fact and fiction. Modern casting, March 1990, pp.38–41.
[3] P. P. Rao, S .K. Putatunda, “Investigations on the fracture toughness of austempered ductile iron alloyed with chromium”, Mater. Sci. Eng.: A346(1–2) (2003) 254–265.
[4] 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.: A315(1–2) (2001) 70–80.
[5] Hua-Qin S, Qigui W, Mi Y, Xinli G, “Some problems in the application of austempered ductile iron in China”, In: Proc World Conf on AD1, Bloomingdale, IL, 1991, p. 388–407.
[6] Defoirdt F., “Research, development and industrial applications of ADI at ferromatrix foundries”, In: Proc 3rd Int Conf on Austempered Ductile Iron, AFS, Bloomingdale, Chicago, USA, 1991, p. 113–28.
[7] Okazaki K., Asai H., Tokoyushi M., Hiroaki K., Sakahara S., “Application of ADI to automotive parts”, In: Proc 3rd Int Conf on Austempered Ductile Iron, AFS, Bloomingdale, Chicago, USA, 1991, p. 288–99.
[8] Hatate M, Shiota T, Takahashi N, Shimizu K., “Influences of graphite shapes on wear characteristics of austempered cast iron”, Wear 2001;251:885–9.
[9] Zhou WS, Zhou QD, Meng SK. Abrasion resistance of austempered ductile iron. Cast Met 1993;6:69–76.
[10] Myszka, D., Kaczorowski, M., Tybulczuk, J. (2003). Austempered ductile cast iron directly isothermal tempered. Wyd. Instytutu Odlewnictwa, Kraków.
[11] S. Gowri and K. Hayrynen, “Understanding Austempered Ductile Iron Process, Production, Properties and Applications – Part III”, Indian Foundry Journal Vol. 59, No. 3, March 2013.
[12] J.M. Prado, A. Pujol, J. Cullel, J. Tartera, Mater. Sci. Technol. 11 (1995) 294–298.
[13] K. Shimizu, T. Noguchi, Wear 176 (1994) 255–260.
[14] Q. Luo, J. Xie, Y. Song, Wear 184 (1995) 1–10.
[15] Zimba J., “Transformation kinetics during the austempering of ductile iron and practical implications”, D.Phil. Thesis, Department of Metallurgical Engineering, University of Zimbabwe, 2002.
[16] M.F. Ashby, J. Abulawi, H.S. Kong, “On surface Temperatures at Dry Sliding Surfaces”, Cambridge University Press, Cambridge, 1990.
[17] J. Zhang, A.T. Alpas, “Transition between mild and severe wear in aluminium alloys”, Acta Mater. 45 (1997) 513–528.
[18] A.S.M.A. Haseeb, Md. Aminul Islam, Md. Mohar Ali Bepari, “Tribological behaviour of quenched and tempered, and austempered ductile iron at the same hardness level”, Wear 244 (2000) 15–19.
[19] Rajendra M. Galagali, Dr. R. G. Tikotkar “Experimental investigations on wear process parameters optimization of Austempered Ductile Iron using Taguchi technique” International Journal of Innovative Research in Science, Engineering and Technology (IJIRSET) – eISSN: 2319-8753, pISSN:2347 6710, Volume4 Issue 4, April 2015.