Effect of thermomechanical processing parameters on phase transformation and hardness of dual matrix ductile iron

Soliman, Mohamed; Ibrahim, Hossam; Nofal, Adel; Palkowski, Heinz

doi:10.1179/1743133615y.0000000037

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Both IADI (1&2) alloys showed elongation and impact toughness values higher than the conventional ADI grades, apparently, the due to the presence of proeutectoid ferrite, whereas the increased strength is attributed to the reinforcing effect of ausferrite in the structure. The effect of ferrite content in IADI alloys was reported [8][9]. The mechanical properties of IADI is controlled by the interaction between the strain hardening component, i.e., retained austenite and ferrite.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

High Strain Rate Dynamic Deformation of ADI

Myszka

Ahmed

Nofal

et al. 2018

MSF

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Engineering materials used in numerous applications, particularly in automotive crash loading and military ballistic purposes have to meet new demands, one of which is the resistance to dynamic loading. As the phenomena associated with such interaction is rather complex, non-static types of tests are applied to evaluate and compare between different potential materials. In this Work, different grades of ADI were produced under different austenitizing and austempering conditions different ausferrite morphologies. The effect of alloying elements such as Cu and Mo on the initial microstructure of the ductile iron was also studied. The initial amount of retained austenite was subjected to different dynamic strain rates. The hardness and strain induced martensitic transformation as a function of the microstructure and strain rate were evaluated. Extensive use of XRD and SEM was made to evaluate the high strain rate properties of the investigated grades.

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Section: Mechanical Propertiesmentioning

confidence: 99%

High Strain Rate Dynamic Deformation of ADI

Myszka

Ahmed

Nofal

et al. 2018

MSF

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Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI)

et al. 2021

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In this study, the effect of the austempering times on the microstructures and mechanical properties of dual-matrix structure austempered ductile iron (DMS-ADI) was investigated. With this aim, unalloyed as-cast ductile iron tensile samples were austenitized at 810 °C for 30 min to intercritical austenitizing followed by austempering at 350°C for various austempering times (45 min to 180 min). Experimental results showed that dual-matrix structures consisting of proeutectoid ferrite ? ausferrite were obtained in austempered ductile iron from intercritical austenitizing temperatures. It was determined that as the austempering time increased, the ausferritic structure became considerably clear and its volume fraction was almost constant (45-47%) after 90 min of austempering time. The yield and tensile strength of the samples decreased and the total elongation and breaking energy increased with increasing austempering times, but after the 120-min austempering time, both the total elongation and breaking energy of the samples decreased. It was established that the austempering times had no significant effect on the morphology of ausferrite. The best mechanical properties were obtained between 70-and 130-minute austempering times that can be defined as the processing window. In addition, it was determined that the DMS-ADI had similar austempering kinetics with the ADI.

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Influence of Austenite Stability on the Machinability of Different Grades of Austempered Ductile Iron (ADI) During Dry Turning Machining

Hussein

Ahmed

Soliman³

et al. 2023

Inter Metalcast

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This work evaluated the machinability characteristics of three different austempered ductile irons using three machinability indicators: cutting force, tool wear, and surface roughness. Additionally, this paper addresses the interplay among the production conditions of ADIs, microstructural development, the TRIP effect arising from transformations of the retained austenite into martensite, and the machinability behavior of ADIs. Various characterization studies including hardness measurement, X-ray diffraction analysis, light and electron microscope were used. Machinability results indicated that the increase in cutting force is always associated with a corresponding increase in the martensite content when the cutting depth was increased from 0.5 to 2.0 mm. Such correlation is more evident with ADI grade austempered at high austempering temperature, 375 °C (ADI-375). It was noticed that although ADI-375 has only 0.46% martensite in the structure before machining, this ratio increases with the highest depth of cut of 2.0 mm to reach about ~ 23% martensite with a corresponding increase in the cutting force. Ferrite content and morphology have a great impact on the overall surface finish of each grade as it leads to deteriorating the surface characteristics of the investigated alloys. This could explain the highest roughness values across all processing experiments obtained in the ADI grade austenitized in the intercritical region (IADI), which mainly contains the highest ferrite content. Tool wear and chip characteristics were also studied in this work.

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Effect of thermomechanical processing parameters on phase transformation and hardness of dual matrix ductile iron

Cited by 4 publications

References 17 publications

High Strain Rate Dynamic Deformation of ADI

High Strain Rate Dynamic Deformation of ADI

Effect of Austempering Times on the Microstructures and Mechanical Properties of Dual-Matrix Structure Austempered Ductile Iron (DMS-ADI)

Influence of Austenite Stability on the Machinability of Different Grades of Austempered Ductile Iron (ADI) During Dry Turning Machining

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