Dry sliding wear of austempered ductile iron

Prado, J. M.; Pujol, Angel; Cullell, J.; Tartera, J.

doi:10.1179/mst.1995.11.3.294

Cited by 29 publications

(9 citation statements)

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“…5). In agreement with previous research [2] , wear of ADI can be considered as a fatigue phenomenon that consists of the nucleation of cracks below or on the surface and growth of these cracks and finally the breaking of the metal particles. In sliding wear, cracks grow parallel to the surface under different loads until they reach a length for which the complex state of stress at the crack tip changes its path toward the surface and final breaking of the metal particles follows immediately.…”

Section: Fig 4: Variation Of Weight Loss With Sliding Distance For Dsupporting

confidence: 48%

“…in many applications. The wear behaviour of ADI has been studied by several researchers [1][2][3][4][5][6] , but most have reported differing results, as wear behaviour of ADI depends on many factors such as alloying elements content, heat treatment variables, test mechanism and the applied load. In this paper, the studies of the influence of Ni on dry sliding wear behaviour and the relationship between them under different austempering heat treatment conditions are presented.…”

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Dry sliding wear of Ni alloyed austempered ductile iron

2016

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U ntil the beginning of the 20th century, the most important property of a casting was its shape, while the mechanical or physical properties were in the second order of importance. A significant development in the field was the discovery of the effect of magnesium on grey cast iron in 1943. The result was the generation of a new cast iron family (ductile iron) with higher tensile strength and ductility compared to that of grey cast iron. A significant advance in the cast iron technology and an equally important development is the austempering of ductile iron. The remarkable combination of properties attainable in austempered ductile iron (ADI) has caused this material to emerge as a new class of ductile iron. The outstanding mechanical properties of ADI are due to the presence and continuity of the FCC austenite matrix. Compared to conventional grades of ductile iron, ADI exhibits more than twice the strength for a given level of ductility. ADI is lighter, stronger and more wear-resistant than steel. Consequently, it is replacing steel forgings, weldments and castings as a weight-saving material Abstract: Measurements of dry sliding wear are presented for ductile irons with composition Fe-3.56C-2.67Si-0.25Mo-0.5Cu and Ni contents of 0.8 and 1.5 in wt.% with applied loads of 50, 100 and 150 N for austempering temperatures of 270, 320, and 370 °C after austenitizing at 870 °C for 120 min. The mechanical property measurements show that the grades of the ASTM 897M: 1990 Standard can be satisfied for the selected austempering conditions. The results show that wear resistance is independent of austempering temperature with an applied load of 50 N, but there is a strong dependence at higher austempering temperatures with applied loads of 100 and 150 N. Observations indicate that wear is due to subsurface fatigue with cracks nucleated at deformed graphite nodules. in many applications. The wear behaviour of ADI has been studied by several researchers [1][2][3][4][5][6] , but most have reported differing results, as wear behaviour of ADI depends on many factors such as alloying elements content, heat treatment variables, test mechanism and the applied load. In this paper, the studies of the influence of Ni on dry sliding wear behaviour and the relationship between them under different austempering heat treatment conditions are presented.

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Section: Fig 4: Variation Of Weight Loss With Sliding Distance For Dsupporting

confidence: 48%

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confidence: 99%

Dry sliding wear of Ni alloyed austempered ductile iron

2016

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“…Prado et al [7] found that during the wear of austempered ductile iron, cracks readily nucleating in the graphite. Even optical microscopy investigation revealed no traces of plastic deformation.…”

Section: Introductionmentioning

confidence: 98%

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Dryzek

Horodek

Wróbel

2012

Wear

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“…This indicates that there are some microstructural parameters which play an important role in controlling the wear. Prado et al [30] and Yang and Putatunda [23] have analysed wear behaviour in ADI in terms of fracture toughness. This approach is valid if gouging action is the major mechanism.…”

Section: Wear Studymentioning

confidence: 99%

Study of wear behaviour of ductile iron subjected to two step austempering

Kumari

Rao

2010

International Journal of Materials Research

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Study of wear behaviour of ductile iron subjected to two step austempering An investigation was carried out to examine the influence of two step austempering on microstructural parameters and the wear behaviour of austempered ductile iron. Ductile iron was austenitised at 900 8C for 30 min, and then austempered successively at two different temperatures. It was first austempered at 300 8C for different durations from 2 min to 30 min and subsequently austempered at 400 8C for 2 h, after which it was quenched to room temperature. Resulting microstructures were characterised through optical microscopy and X-ray diffraction. Mechanical properties were studied through hardness measurement and tensile testing. Wear studies were carried out using a pin-on-disc machine. Wear rate was found to decrease with increasing time at the first step temperature of 300 8C. At short austempering times at 300 8C, the amount of austenite was instrumental in improving the wear resistance through formation of deformation induced martensite. Wear rate was found to depend on yield strength, austenite content and its carbon content.Keywords: Ductile iron; Austempering; Wear; Austenite IntroductionAustempered ductile iron (ADI) is an interesting engineering material because of its unique microstructure and excellent combination of high strength and ductility [1 -3]. While the microstructure of austempered steel consists of ferrite and carbide called as bainite, that of austempered ductile iron consists of ferrite and high carbon stabilised austenite. Austenite is present because of the presence of large amount of silicon in ductile iron which prevents the formation of carbide. This microstructure is generally called ausferrite to distinguish it from the bainite of steel. The ausferrite microstructure can be varied widely by varying the austempering temperature [4 -6]. When austempered at low temperatures in the range of 280 -320 8C, it exhibits very fine laths of ferrite interspersed with very thin layers of austenite. When austempered at higher temperatures, such as 350 -400 8C, the microstructure consists of coarse ferrite laths within bulky austenite. These microstructures are referred to as lower ausferrite and upper ausferrite respectively. While the former shows high strength and low ductility, the latter exhibits lower strength and higher ductility. Wear properties of ADI have been studied by several investigators [7 -10]. The ADIs austempered at low temperatures such as 300 8C show better wear resistance than those austempered at higher temperatures such as 400 8C because of the much higher hardness of the former. However, ADIs generally show better wear resistance than hardened and tempered steels of comparable hardness. This is due to the presence of substantial amounts of austenite. The austenite imparts improved wear resistance to ADI because of its better strain hardening ability.Recently Daber and Rao [11] as well as Daber, Ravishankar and Rao [12] have shown that interesting microstructures can be obtained through a two step ...

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Dry sliding wear of austempered ductile iron

Cited by 29 publications

References 3 publications

Dry sliding wear of Ni alloyed austempered ductile iron

Dry sliding wear of Ni alloyed austempered ductile iron

Use of positron annihilation measurements to detect the defect beneath worn surface of stainless steel 1.4301 (EN) under dry sliding condition

Study of wear behaviour of ductile iron subjected to two step austempering

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