Effect of Low Temperatures on Charpy Impact Toughness of Austempered Ductile Irons

Riabov, Mikhail V.; Lerner, Yury S.; Fahmy, Mohammed F.

doi:10.1361/105994902770343728

Cited by 9 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the presence of retained austenite at 16?5 and 19 vol.-% for ADI alloyed with Cu and CuzNi respectively significantly influences the behaviour of ADI material at low temperatures, delaying the appearance of brittle fracture. The increase in ductility with increases of retained austenite content in low temperature impact testing of ADIs has been also reported by Riabov et al 18 Moreover, Aranzbal et al 19 and Rao and Putatunda 20 showed that the refinement of ausferrite microstructure, i.e. formation of fine acicular ferrite with austenite present as layers in between the ferrite, promotes further increase in ductility of ADIs, especially in the case when volume fraction of retained austenite is less than y25 vol.-%.…”

Section: Resultssupporting

confidence: 77%

Austempering study of unalloyed and alloyed ductile irons

Šidjanin

Rajnović

Erić³

et al. 2010

Materials Science and Technology

View full text Add to dashboard Cite

Austempered ductile iron (ADI) proved to be an advanced material as it possesses remarkable combination of high strength, ductility and toughness with good wear resistance and machinability. These properties can be achieved upon adequate heat treatment which yields optimum microstructure for a given chemical composition. In the present paper, an investigation has been conducted on unalloyed ADI and alloyed with 0·47%Cu and 1·6%Cu + 1·5%Ni, austempered at 350°C for the time up to the 6 h. The microstructure and fracture mode developed throughout these treatments have been studied by means of light, transmission and scanning electron microscopy, as well as X-ray diffraction. It was shown that the strength, elongation and impact energy strongly depend on amount of ausferritic ferrite and stable, high carbon enriched retained, reacted austenite. Based on the results, optimal processing windows for alloyed ductile irons used, have been established. In addition, for alloyed ADIs with maximum amount of reacted, retained austenite, transition temperature was also obtained.

show abstract

Section: Resultssupporting

confidence: 77%

Austempering study of unalloyed and alloyed ductile irons

Šidjanin

Rajnović

Erić³

et al. 2010

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…Hence, the presence of retained austenite in volume fractions of 16.5 and 19% for ADI materials alloyed with Cu and Cu+Ni, respectively, significantly influence the behaviour of ADI material at low temperatures, delaying the appearance of brittle fracture. The increase of ductility with increases of retained austenite content in low‐temperature impact testing of ADIs has been also reported by Riabov et al (2002). Moreover, Aranzbal et al (1997) and Rao & Putatunda (2003) showed that the refinement of ausferrite microstructure, that is formation of fine acicular ferrite with austenite present as a film in between the ferrite sheaves, promote further increase of ductility of ADIs especially in cases when the volume fraction of retained austenite is less than approximately 25%.…”

Section: Resultssupporting

confidence: 56%

“…The as–cast DI and ADI are widely used for large parts of machinery that work in all weather conditions. In view of that, it is of great importance to know the behaviour of DI and ADI at low temperatures (Riabov et al , 2002; Batra et al , 2007). One very important criterion for materials selection, especially in low‐temperature applications, is the ductile to brittle transition temperature (Ratto et al , 2001; Fierro et al , 2002).…”

Section: Introductionmentioning

confidence: 99%

Transition temperature and fracture mode of as‐castand austempered ductile iron

Rajnović

Erić²,

Šidjanin

2008

Journal of Microscopy

View full text Add to dashboard Cite

SummaryThe ductile to brittle transition temperature is a very important criterion that is used for selection of materials in some applications, especially in low-temperature conditions. For that reason, in this paper transition temperature of as-cast and austempered copper and copper-nickel alloyed ductile iron (DI) in the temperature interval from −196 to +150• C have been investigated. The microstructures of DIs and ADIs were examined by light microscope, whereas the fractured surfaces were observed by scanning electron microscope. The ADI materials have higher impact energies compared with DIs in an as−cast condition. In addition, the transition curves for ADIs are shifted towards lower temperatures. The fracture mode of Dls is influenced by a dominantly pearlitic matrix, exhibiting mostly brittle fracture through all temperatures of testing. By contrast, with decrease of temperature, the fracture mode for ADI materials changes gradually from fully ductile to fully brittle.

show abstract

“…5. Charpy impact energy is decreased, while the test temperature is decreased [8]. The highest impact energy values obtained in this research of ADI is 14 J (357˚C, 2.5 hrs.).…”

Section: Impact Propertiesmentioning

confidence: 57%

The Effects of Austempering Temperature and Time on Mechanical Properties of Ductile Cast Iron Grade FCD450

Chantarach

Canyook

2020

KEM

View full text Add to dashboard Cite

The purpose of the study was to inspect microstructure, mechanical properties and impact toughness of ductile cast iron grade FCD450 produced by austempering process. The study focused on austempering parameter, which effected impact toughness of material at low temperature. The FCD450 was initially temperature austenized at 885°C (1625˚F) for 2 hours. Austempering was carried out at three different temperatures of 271°C (520˚F), 313°C (560˚F) and 357°C (675˚F). The austempering temperature were varied at 1.5, 2.5 and 3.5 hours. X-ray diffraction was showed that the austempered ductile cast iron (ADI) microstructure consists of austenite and ferrite. The results showed that when austempered at 357°C (675˚F) for 2.5 hours has highest hardness and impact energy at low temperature. The dimple ductile fracture of ADI fracture surfaces was revealed by scanning electron microscope (SEM).

show abstract

Effect of Low Temperatures on Charpy Impact Toughness of Austempered Ductile Irons

Cited by 9 publications

References 3 publications

Austempering study of unalloyed and alloyed ductile irons

Austempering study of unalloyed and alloyed ductile irons

Transition temperature and fracture mode of as‐castand austempered ductile iron

The Effects of Austempering Temperature and Time on Mechanical Properties of Ductile Cast Iron Grade FCD450

Contact Info

Product

Resources

About