Study of the effects of austempering temperature and time on scuffing behavior of austempered Ni–Mo–Cu ductile iron

Han, Jiman; Zou, Qian; Barber, Gary C.; Nasir, T.; Northwood, Derek O.; Sun, Xichen; Seaton, Philip

doi:10.1016/j.wear.2012.05.003

Cited by 20 publications

(9 citation statements)

References 17 publications

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“…The wear surface morphology of the sample without Mo has more voids because the amount of nodular graphite is more than the samples containing Mo; additionally, the lower hardness caused by the decreased amount of carbides leads to deeper furrows. Though the graphite present can serve as a lubricant, the wear particles produced in the wear process will destroy the lubricant film [15]. Therefore, the wear resistance of the sample without the addition of Mo is the poorest.…”

Section: Resultsmentioning

confidence: 99%

Effects of Molybdenum on the Wear Resistance and Corrosion Resistance of Carbidic Austempered Ductile Iron

Han

Wang

Sun

et al. 2015

Metallogr. Microstruct. Anal.

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The effects of molybdenum on the microstructure, wear resistance, and corrosion resistance of carbidic austempered ductile iron were studied. The results show that the microstructures of as-cast samples are mainly composed of nodular graphite, pearlite and carbides, and the nodularization grade is 2-3 and graphite size is 6-7 magnitude in all samples. With the increase of Mo content, the amount of nodular graphite decreases, but the pearlite and carbides increase. The microstructures of all heattreated samples mainly consist of nodular graphite, acicular ferrite, retained austenite, and a certain number of carbides. As the molybdenum content increases, the quantity of retained austenite and carbides increases, the acicular ferrite becomes finer, and the wear resistance and corrosion resistance increased. When the concentration of molybdenum reaches 0.570 wt%, the average wear weight loss decreased to 0.218 mg/m, the corrosion potential reached to -0.5626 V, and the corrosion current density decreased to 6.361 9 10 -8 A/cm 2 .

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Section: Resultsmentioning

confidence: 99%

Effects of Molybdenum on the Wear Resistance and Corrosion Resistance of Carbidic Austempered Ductile Iron

Han

Wang

Sun

et al. 2015

Metallogr. Microstruct. Anal.

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“…The carbon content of the high carbon austenite was calculated by using equation ( 5) [27] for the highest retained austenite content obtained at each plate thickness. (5) where:…”

Section: (4)mentioning

confidence: 99%

“…Austempered ductile iron or ADI is obtained by austempering and has excellent mechanical properties, such as good ductility and fracture toughness, high strength, good wear resistance, high fatigue strength, as well as rolling contact resistance and a lower density than steels [3,4]. These properties can be achieved by a microstructure of graphite nodules in ausferrite matrix constituted by acicular ferrite (α ac ) and high carbon austenite ( HC ) [5]. The austempering heat treatment starts with the austenitizing stage in a temperature range between 850 to 950 °C over a certain period to ensure that the matrix transforms into austenite [6].…”

Section: Introductionmentioning

confidence: 99%

Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

García

Cruz-Ramírez

Romero-Serrano

et al. 2021

J min metall B Metall

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Samples of ductile iron alloyed with 0.88 % Ni with a nodule count of 606, 523, and 290 nod/mm2 were obtained from sand cast plates of different thickness in the range from 8.46 to 25.4 mm. The effect of the nodule count was evaluated during the austempering process held at 285?C and austempering times of 15, 30, 45, 60, 70, and 90 min. The volume fraction of high carbon austenite was increased when the nodule count was increased, however, the carbon content of the high carbon austenite kept almost constant. The process window was narrow, requiring a lower austempering time when the nodule count was increased. The combination of a higher nodule count and low austempering temperature allows obtaining a fine ausferritic microstructure which leads higher Brinell hardness and tensile strength. The process window was determined by XRD measurements and it is in good agreement with the microstructural and hardness evolution as the austempering time was increased.

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“…Ductile cast irons and austempered cast irons (ADI) have recently appeared as significant engineering materials capable of meeting these kinds of features. Due to their specific combination of high strength, toughness, ductility, machinability and fatigue and wear resistance, they have been used in many industries -also in dependable tribological applications [11][12][13]. Irrespective of the good mechanical properties of DCI, it is necessary to pay attention to its specific tribological behaviour [14].…”

Section: Scuffing and Catastrophic Wearmentioning

confidence: 99%

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

Wojciechowski

Eymard

Ignaszak

et al. 2015

Tribology International

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Study of the effects of austempering temperature and time on scuffing behavior of austempered Ni–Mo–Cu ductile iron

Cited by 20 publications

References 17 publications

Effects of Molybdenum on the Wear Resistance and Corrosion Resistance of Carbidic Austempered Ductile Iron

Effects of Molybdenum on the Wear Resistance and Corrosion Resistance of Carbidic Austempered Ductile Iron

Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

Fundamentals of ductile cast iron scuffing at the boundary lubrication regime

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