Artificial indentations for the study of contact fatigue of austempered ductile iron (ADI) discs

Magalhães, Luís; Seabra, Jorge

doi:10.1016/j.wear.2004.12.011

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…The authors attribute this result to an increase in gear tooth surface hardness. A similar observation was made by Magalhães and Seabra [20,21] who report that a high tensile strength, which is accompanied by a high hardness will result in the best contact fatigue resistance of gears.…”

Section: Introductionsupporting

confidence: 82%

Shot peening of austempered ductile iron gears

Zammit

Bonnici

Mhaede

et al. 2017

Surface Engineering

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This study investigates the suitability of shot peening as a surface treatment for austempered ductile iron (ADI) gears to lengthen their service life. Several studies have shown that shot peening prolongs the bending fatigue life of components. However, from the few works conducted on the tribological behaviour of ADI, it is not clear whether an improvement exists by shot peening. Hence, this work was conducted to study the contact fatigue resistance of shot peened ADI gears. Tests on as-ADI and shot peened ADI gears, as well as carburised steel gears were carried out. The results showed that the carburised steel gears exhibited superior performance and withstood the longest number of cycles before failure. The shot peened gears survived the lowest number of cycles. The poor performance after shot peening was attributed to an increase in the surface roughness induced by the peening process. In fact, the negative impact resulting from the roughened surface is greater than the benefits prompted by the induced compressive residual stresses, higher surface hardness and stress-induced austenite to martensite transformation.

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Section: Introductionsupporting

confidence: 82%

Shot peening of austempered ductile iron gears

Zammit

Bonnici

Mhaede

et al. 2017

Surface Engineering

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“…Different researchers [ 52 , 53 , 54 , 55 ] have previously demonstrated that modifying the austempering process parameters (time and temperature) can change the microstructure of ADI and lead to various wear behaviors. In the current investigation, it was determined that this was accurate.…”

Section: Effect Of Heat Treatment On Tribological Behavior Of Adimentioning

confidence: 99%

A Review on Heat Treatment of Cast Iron: Phase Evolution and Mechanical Characterization

et al. 2022

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The isothermal heat treatment process has been identified as a unique process of fabricating exceptional graphite cast iron due to its remarkable mechanical properties, such as excellent machinability, toughness, and high level of ultimate tensile strength. Austempered ductile iron (ADI), ductile iron (DI), and gray cast iron (GCI), known as spheroidal cast irons, are viable alternative materials compared to traditional steel casting, as well as aluminum casting. The graphite nodules from the microstructures of DI, ADI, and GCI are consistently encompassed by acicular ferrite and carbon-saturated austenite in the matrix, forming a distinctive ausferritic structure. All these materials are extensively used in the fabrication of engine sleeves, engine blocks, valves, gears, and camshafts in the automobile sector. With relative motion and outward loads, these components are regularly exposed to surface contact. In this project, it was observed that austempering temperature and a shorter holding period could also be used to manufacture needle-like ferrite platelets for austempered ductile iron (ADI) and other graphite cast irons. To overcome the brittleness challenges and catastrophic failures encountered by applied loads in present-day applications, it is essential to comprehend the isothermal treatments, morphological behaviors, phase analyses, processing techniques, and mechanical properties needed to properly incorporate these materials into future designs. This review article provides detailed information on the characterization and relevant potential mechanisms of ADI, DI, and GCI.

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