Development of as-cast dual matrix structure (DMS) ductile iron

Murcia, Sandra; Paniagua, Marco; Ossa, E.A.

doi:10.1016/j.msea.2012.12.033

Cited by 35 publications

(15 citation statements)

References 38 publications

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“…[4] Apart from mentioned above, austempering parameters including austempering time and temperature play important roles in the resultant microstructure, mechanical properties, and wear resistance of the alloyed ductile iron for heavy section wear-resistant alloyed ductile iron. [5][6][7][8] Austempered ductile cast irons (ADI) contain highcarbon austenite and ferrite (often referred to as ausferrite microstructure) as matrix, where the dual-phase microstructure confers a high strength. [8] Ductile cast iron can possess aus-ferrite structure by alloying addition such as Ni, Mo, and Cu followed by subsequent heat treatment.…”

Section: Junjun Cui and Liqing Chenmentioning

confidence: 99%

“…It is known that the long holding time leads to carbide precipitation, which occurs in two-phase bainitic ductile iron after holding for some period. [5] In the lower temperature region of 623 K to 523 K (350°C to 250°C), the corresponding incubation time is shorter (220 to 1000 seconds). The bainite formed in ranges of 723 K to 623 K (450°C to 350°C) and 623 K to 473 K (350°C to 200°C) has different morphologies-feathery-like in the former and plate-like in the latter.…”

Section: A Ttt Curvementioning

confidence: 99%

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Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Cui

Chen

2015

Metall Mater Trans A

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To further improve the mechanical performance of a new type of alloyed bainitic wear-resistant ductile iron, the effects of the various austempering temperatures have been investigated on microstructure and mechanical behaviors of alloyed ductile iron Fe-3.50C-1.95Si-3.58Ni-0.71Cu-0.92Mo-0.65Cr-0.36Mn (in weight percent). This alloyed ductile iron were firstly austenitized at 1123 K (850°C) for 1 hour and then austempered in a salt bath at 548 K, 573 K, and 598 K (275°C, 300°C, and 325°C) for 2 hours according to time-temperature-transformation diagram calculated by JMatPro software. The microstructures of austempered wearresistant ductile irons consist of matrix of dark needle-like ferrite plus bright etching austenite and some amount of martensite and some dispersed graphite nodules. With increasing the austempering temperature, the amount of ferrite decreases in austempered ductile iron, while the amount of austenite and carbon content of austenite increases. There is a gradual decrease in hardness and increase in compressive strength with increasing austempering temperature. The increased austenite content and coarsened austenite and ferrite can lead to a hardness decrease as austempering temperature is increased. The increased compressive strength can be attributed to a decreased amount of martensitic transformation. The alloyed ductile iron behaves rather well wear resistance when the austempering is carried out at 598 K (325°C) for 2 hours. Under the condition of wear test by dry sand/rubber wheel, the wear mechanisms of austempered ductile irons are both micro-cutting and plastic deformation.

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Section: Junjun Cui and Liqing Chenmentioning

confidence: 99%

Section: A Ttt Curvementioning

confidence: 99%

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Cui

Chen

2015

Metall Mater Trans A

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“…However, a very small amount of proeutectoid ferrite was retained in SG-9 alloy [ Fig.2 (e)]. It was quite interesting to note that, both the alloys when treated at an intercritical austenitizing temperature (800°C) produce a microstructure with stable martensite (M) and ferrite (F) [15], Fig.2 (g) & (h). From the quantitative analysis, it was observed that alloy SG-2 had higher ferrite volume fraction than alloy SG-9, whereas the latter had higher martensite volume fraction.…”

Section: X-ray Diffraction Analysismentioning

confidence: 96%

Suitability of SG Iron to Be Used As Nuclear Fuel Transport Cask

Behera¹,

Mishra²,

Sen³

et al. 2016

3rd Annual International Conference on Materials Science, Metal and Manufacturing ( M3 2016 )

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Morphological aspects such as volume fraction of various phases, nodularity, and nodule count are responsible for mechanical properties of Spheroidal graphite cast iron (SG Iron)/ Ductile iron (DI). In present work, DI specimens were subjected to different heat treatment processes to correlate the mechanical properties with microconstituents, to be used for spent nuclear fuel cask fabrication. The investigation revealed higher strength for tempered martensitic specimens with a considerable amount of ductility. Increased Si & Cr content resulted increasing in ferrite volume fraction consequently leading to increased ductility and impact toughness, whereas increased pearlite volume fraction resulted in increased hardness.

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“…Ductile iron's chemical and metallurgical characteristics make it the strongest and hardest cast iron, and also with the highest maximum durability. [10][11][12]. A study of the production of iron makes it simple to understand the advantages of ductile iron.…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

Boulifa

Hadji

2021

Frattura Ed Integrità Strutturale

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In the present work, the influence of alloying elements, on the mechanical characteristics and wear behavior by modification of the chemical composition of the ductile iron was studied, in order to improve these characteristics for the manufacture of agricultural tractors parts in particular front and rear axles, ploughshares, gear crankcase, pinions, transmission shafts, crankshafts, etc... The cast iron investigated was prepared in an induction furnace at 1500°C and inoculated with a ferro-silicon-magnesium to 45% Si and 10% Mg. The specimens were casted into self-hardening sand moulds at 1450°C, after an addition of alloying elements, Manganese (0.6%), Nickel (0.5%), Molybdenum (0.2%) and Vanadium(0.1%)) in the base spheroidal graphite cast iron produced. Various techniques, Optical microscopy, Microhardness, Hardness, Tensile strength, Impact resistance, and Wear tests (Wear resistance and Friction coefficient) were used to characterize these specimens. The obtained results show that the tested samples have ductile iron structures formed by ferrite and pearlite. Moreover, mechanical and wear tests prove that the alloyed cast iron has improved characteristics compared to unalloyed cast iron and shows the positive effect of alloying elements on these characteristics.

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Development of as-cast dual matrix structure (DMS) ductile iron

Cited by 35 publications

References 38 publications

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Microstructures and Mechanical Properties of a Wear-Resistant Alloyed Ductile Iron Austempered at Various Temperatures

Suitability of SG Iron to Be Used As Nuclear Fuel Transport Cask

Study of the Influence of Alloying Elements on the Mechanical Characteristics and Wear Behavior of a Ductile Cast Iron

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