Effects of Successive-stage Austempering on the Structure and Impact Strength of High-Mn Ductile Iron

Nili‐Ahmadabadi, Mahmoud; Ohide, Taku; Niyama, Eisuke

doi:10.1080/09534962.1992.11819094

Cited by 23 publications

(7 citation statements)

References 3 publications

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“…and Mn concentrated in the intercellular region. The calculated result coincides with experimental results reported by many researchers [9,17,18]. Fig.…”

Section: Calculation Methodssupporting

confidence: 91%

Homogenization of ductile iron using partial melting aided by modeling

Nili‐Ahmadabadi

Mosallaiee-Pour

2004

Materials Science and Engineering: A

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“…and Mn concentrated in the intercellular region. The calculated result coincides with experimental results reported by many researchers [9,17,18]. Fig.…”

Section: Calculation Methodssupporting

confidence: 91%

Homogenization of ductile iron using partial melting aided by modeling

Nili‐Ahmadabadi

Mosallaiee-Pour

2004

Materials Science and Engineering: A

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“…The relative wear resistance index, E, was obtained by the ratio between the volume loss experienced by a reference material ( V R ), (in this case a SAE 1010 steel) and by the ductile iron sample ( V S ), according to Eq. (1). Weight loss values were measured by means of a 0.1 mg precision scale and then converted into volume loss by using the density value measured for this iron heat.…”

Section: Wear Resistance Testsmentioning

confidence: 99%

“…During the nineties up today some researchers have evaluated modifications to the austempering heat treatment cycles, in order to obtain a better combination of tensile strength and toughness. For example, Nili Ahmadabadi et al [1,2] developed the "successive-stage austempering", also called "high low austempering". The result was the reduction of the untransformed austenite volume (UAV) at the segregated regions, which in turn promoted higher impact toughness.…”

Section: Introductionmentioning

confidence: 99%

Abrasion resistance of ductile iron austempered by the two-step process

Francucci

Sikora

Dommarco

2008

Materials Science and Engineering: A

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“…[15][16][17][18] The need for high nodule counts from both an austenitization and an austempering perspective can therefore not be over-emphasized. This can translate into increased power consumption during heat treatment.…”

Section: Reprintsmentioning

confidence: 99%

A Dilatometry Study of the Austenitization and Cooling Behavior of Ductile Iron Meant for the Production of Austempered Ductile Iron (ADI)

Zimba

Simbi

Chandra

et al. 2004

Materials and Manufacturing Processes

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An understanding of the kinetics of transformation during austenitization, cooling, and austempering of ductile iron is critical to achieving the desired microstructures and ultimately mechanical properties in austempered ductile iron (ADI). To this end, dilatometry experiments have been carried out to study the austenitization and cooling behavior of an unalloyed ductile iron. When a typical austenitization temperature of 900 C is used, unlike in steels, there is an initial expansion of the specimen, which levels off as the soaking time is increased. This occurs despite the fact that the temperature remains constant. This phenomenon, hitherto unreported, highlights the subtle differences between the austenitization of ductile irons and steels. The initial expansion is attributed to the increase in austenite lattice parameter, arising from the diffusion of carbon from the graphite nodules. The levelling off signals the saturation of austenite with carbon and can ORDER REPRINTS therefore be used as an indicator of the appropriate austenitization time. Studies of the cooling behavior of unalloyed ductile iron have also shown that the dilatometer can be used as a tool for determining the minimum cooling rates, which guarantee the formation of ausferrite during austempering. When ductile iron is appropriately heat-treated based on results from dilatometry studies, the mechanical properties obtained are typically superior and consistent.

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Effects of Successive-stage Austempering on the Structure and Impact Strength of High-Mn Ductile Iron

Cited by 23 publications

References 3 publications

Homogenization of ductile iron using partial melting aided by modeling

Homogenization of ductile iron using partial melting aided by modeling

Abrasion resistance of ductile iron austempered by the two-step process

A Dilatometry Study of the Austenitization and Cooling Behavior of Ductile Iron Meant for the Production of Austempered Ductile Iron (ADI)

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