Fractomechanical Properties of As-Cast and Austempered SG Cast Iron Between -40 °C and +20 °C

Fierro, V. E.; Sikora, Jorge Antonio; Agüera, F.R.; Villar, H. N. Alvarez; Ansaldi, A.; Ratto, P.J.J.

doi:10.1590/s1516-14392002000200009

Cited by 2 publications

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“…During the last years the industrial use of NCIs iron has been increasing and many investigations on the characterization and improvement of its mechanical properties have been developed 2 . Examples of the use of NCIs are automotive parts such as camshafts, crankshafts, water pump housings, valves and steering articulations 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural characterization of Nodular Cast Iron (NCI) with Niobium Additions

et al. 2014

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Nodular cast irons (NCIs) involve the inoculation and nodulization of 0.03 to 0.06wt% Magnesium, as well as the addition of Molybdenum, Chromium, Nickel, Copper and Vanadium, although the presence of Niobium is not common. The literature reports that Niobium leads to better mechanical properties of the NCIs, and recent results indicate that 0.5wt% Niobium increases the strength and the Charpy notch toughness of NCIs, but decreases its hardness, in relation to a similar NCI without Niobium. The present report studies the addition of 0.23, 0.47, 0.67, and 0.85wt% Niobium to a NCI covering the effects on the microstructures, yield and tensile strengths, tensile elongations and Charpy toughness. The NCIs were prepared in a 120 kg medium frequency induction furnace, and samples were obtained following the ASTM A842 standard; the various test specimens were extracted from these samples according to specific standards for each test. Fracture analysis was performed in fractures specimens after the Charpy tests. It was shown that the volume fraction of pearlite increases as the Niobium content is raised, leading to increments in the yield and tensile strengths and hardness of these materials. Modest increment of tensile ductility and Charpy toughness are observed only for an addition of 0.23% Niobium. Fracture analysis revealed typical brittle cleavage surfaces and decohesion between grains and grain -graphite nodules interfaces, and very low porosity

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Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural characterization of Nodular Cast Iron (NCI) with Niobium Additions

et al. 2014

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“…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

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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.

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Fractomechanical Properties of As-Cast and Austempered SG Cast Iron Between -40 °C and +20 °C

Cited by 2 publications

References 3 publications

Mechanical and microstructural characterization of Nodular Cast Iron (NCI) with Niobium Additions

Mechanical and microstructural characterization of Nodular Cast Iron (NCI) with Niobium Additions

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

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