Scuffing and rolling contact fatigue resistance of discrete laser spot hardened austempered ductile iron

Zammit, Ann; Abela, Stephen; Betts, John C.; Michalczewski, R.; Kalbarczyk, M.; Grech, M.

doi:10.1016/j.wear.2019.01.061

Cited by 27 publications

(20 citation statements)

References 24 publications

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“…This can be achieved by either using shots having a smaller diameter, or by grinding/polishing the surface Figure 13. (a) Weibull probability plot for data obtained from rolling contact fatigue tests and (b) L10, L50, characteristic (η) fatigue lives for as-austempered and shot-peened ADI specimens [19,45].…”

Section: Rolling Contact Fatigue Resistance Of Shot-peened Cu-ni Adimentioning

confidence: 99%

Shot Peening of Austempered Ductile Iron

Zammit¹

2018

Advanced Surface Engineering Research

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Austempered ductile iron (ADI) is a type of heat-treated cast iron, which offers numerous positive advantages including: good combination of mechanical properties and damping characteristics, lower density than steel and the possibility of casting components into near-net shape. However, surface engineering techniques are necessary to extend the use and prolong the lifetime of ADI engineering components. One such treatment for improving the bending fatigue strength of ADI is shot peening. This treatment creates compressive residual stresses and high dislocation densities at the surface of the treated components. However, the shot peening process is not always beneficial in improving the tribological characteristics of ADI. Its behaviour depends on the type of wear mechanism, applied loads, lubrication, heat treatment process parameters and the resulting surface finish of the components. This chapter will look into the effect of shot peening on ADI in more detail and will delve into a case study, which was carried out to analyse the bending fatigue resistance and tribological characteristics of Cu-Ni-alloyed ADI.

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Section: Rolling Contact Fatigue Resistance Of Shot-peened Cu-ni Adimentioning

confidence: 99%

Shot Peening of Austempered Ductile Iron

Zammit¹

2018

Advanced Surface Engineering Research

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“…The main findings were reported as: polishing by grinding results in both a smoothened surface and an increased fatigue life [22]. Laser spot hardening was also considered as one method of surface treatments, as a measure to reduce the scuffing and rolling contact fatigue of Cu-Ni ADI [23]. However, it was discovered that a higher volume of formed martensite (higher hardness) and residual compressive stresses were among the results of laser hardening.…”

Section: Introductionmentioning

confidence: 99%

Influence of Austempering Temperatures on the Microstructure and Mechanical Properties of Austempered Ductile Cast Iron

Bendikienė

Čiuplys

Česnavičius

et al. 2021

Metals

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The influence of the austempering temperatures on the microstructure and mechanical properties of austempered ductile cast iron (ADI) was investigated. ADI is nodular graphite cast iron, which owing to higher strength and elongation, exceeds mechanical properties of conventional spheroidal graphite cast iron. Such a combination of properties is achieved by the heat treatment through austenitization, followed by austempering at different temperatures. The austenitization conditions were the same for all the samples: temperature 890 °C, duration 30 min, and quenching in a salt bath. The main focus of this research was on the influence of the austempering temperatures (270 °C, 300 °C, and 330 °C) on the microstructure evolution, elongation, toughness, and fatigue resistance of ADI modified by certain amounts of Ni, Cu, and Mo. The Vickers and Rockwell hardness decreased from 535.7 to 405.3 HV/1 (55.7 to 44.5 HRC) as the austempering temperature increased. Optical images showed the formation of graphite nodules and a matrix composed of ausferrite; the presence of these phases was confirmed by an XRD diffraction pattern. A fracture surface analysis revealed several types of the mechanisms: cleavage ductile, transgranular, and ductile dimple fracture. The stress-controlled mechanical fatigue experiments revealed that a 330 °C austempering temperature ensures the highest fatigue life of ADI.

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“…Research has also shown that for ADI, laser surface hardening parameters must be carefully controlled. Also according to Zammit et al [14] laser hardening improves the rolling contact fatigue resistance of ADI samples, according to SEM micrographs.…”

Section: Introductionmentioning

confidence: 99%

SEM and XRD Characterisation of Fusion Lines Obtained on Austempered Ductile Iron by Laser Beam Welding without Preheating

Mon

Țierean

Baltes

2021

ENS

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This study highlights the weldability of austempered ductile iron (ADI) using laser welding. SEM, EDS and XRD analysis were performed on fusion lines, heat affected zone (HAZ) and melted zone (MZ). Welding speed (Ws) and laser power (P) were varied. The heat affected zone is composed of graphite, perlite and martensite; the melted and solidified zone contains graphite, ferrite and cementite. XRD results are in accordance with SEM micrographs.

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Scuffing and rolling contact fatigue resistance of discrete laser spot hardened austempered ductile iron

Cited by 27 publications

References 24 publications

Shot Peening of Austempered Ductile Iron

Shot Peening of Austempered Ductile Iron

Influence of Austempering Temperatures on the Microstructure and Mechanical Properties of Austempered Ductile Cast Iron

SEM and XRD Characterisation of Fusion Lines Obtained on Austempered Ductile Iron by Laser Beam Welding without Preheating

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