Solidification of Thin Wall Ductile Iron Castings with Hypereutectic Composition

Górny, M.

doi:10.2355/isijinternational.50.847

Cited by 10 publications

(3 citation statements)

References 10 publications

(18 reference statements)

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“…According to [24] undercooling of the nucleation from liquid during ductile iron solidification in the thin wall reaches up to 65 K below the equilibrium temperature. Grain nucleation in industrial alloys has a heterogeneous nature.…”

Section: Nucleationmentioning

confidence: 99%

Modelling of Eutectic Saturation Influence on Microstructure in Thin Wall Ductile Iron Casting Using Cellular Automata

Burbelko¹,

Gurgul²,

Kapturkiewicz³

et al. 2012

Archives of Foundry Engineering

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The mathematical model of the globular eutectic solidification in 2D was designed. Proposed model is based on the Cellular Automaton Finite Differences (CA-FD) calculation method. Model has been used for studies of the primary austenite and of globular eutectic grains growth during the ductile iron solidification in the thin wall casting. Model takes into account, among other things, non-uniform temperature distribution in the casting wall cross-section, kinetics of the austenite and graphite grains nucleation, and non-equilibrium nature of the interphase boundary migration. Calculation of eutectic saturation influence (Sc = 0.9 - 1.1) on microstructure (austenite and graphite fraction, density of austenite and graphite grains) and temperature curves in 2 mm wall ductile iron casting has been done.

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Section: Nucleationmentioning

confidence: 99%

Modelling of Eutectic Saturation Influence on Microstructure in Thin Wall Ductile Iron Casting Using Cellular Automata

Burbelko¹,

Gurgul²,

Kapturkiewicz³

et al. 2012

Archives of Foundry Engineering

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“…Apart from the opportunity of acquirement the components with enhanced combinations of properties, it is also possible to reduce cost of their production. It is very common, that high final properties, as hardness, high corrosion or wear resistance, are demanded only on the working surface of the castings, so manufacturing whole casting from material which meet these requirements seems not to be reasonable, because such components are usually made from expensive and hard to reach materials [1][2][3][4][5]. Therefore, the concept of the researches uses existing layered casting technology, based on the mould cavity preparation method with a monolithic insert [6][7][8][9][10][11][12][13], to obtain a bimetallic casting in system: working layer made of corrosion-resistant steel, from the high-chromium group X46Cr13 grade with a grey cast iron EN-GJL-HB 255 base part.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Przyszlak,

Wróbel

2019

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The paper presents the technology of manufacturing layered castings, consisting of grey cast iron (base part) and high-chromium stainless steel (working part/layer). The aim of researches was an attempt of integration of heat treatment of steel X46Cr13 grade with founding of grey cast iron in bimetallic system and determination of the influence of cooling rate of bimetallic system in classical sand mould with bentonite on microstructure and hardness of the working layer. The castings were manufactured using mould cavity preparation method, where steel plate was poured by grey cast iron using different pouring temperature and thickness of base part. Then, the quality of joint between cast iron and steel plate was estimated by using ultrasonic non-destructive testing. The efficiency of heat treatment process was analysed by measurement of hardness and in metallographic examination. Conducted studies showed, that self-hardening's ability of steel X46Cr13 let obtain technologically usable layered casting characterized by hardness of working surface up to 35 HRC.

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“…[1][2][3][4][5][6][7][8][9][10] This unfavourable effect is caused by sulphur contained in a hardener of resin binders, which enters the surface layer causing degradation of a nodular graphite into flake graphite. In such case the degenerated surface layer can cause stress raising in the casting, similar to a notch, so all useful properties are reduced, especially the fatigue limit and impact resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Quality of Furan Moulding Sand on the Skin Layer of Ductile Iron Castings

et al. 2014

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The paper presents the results of investigations of the influence of the quality of moulding sand with furfuryl resin hardened by paratoluenosulphonic acid, on the formation of microstructure and surface quality of ductile iron castings. Within the studies different moulding sands were used: moulding sand prepared with fresh sand and moulding sands prepared with reclaimed sands of a different purification degree, determined by the ignition loss value. Various concentrations of sulphur and nitrogen in the sand moulds as a function of the ignition loss were shown in the paper as well as the gas emission and gas evaporation rate from the moulding sands. A series of experimental melts of ductile iron in moulds made of moulding sand characterized by different levels of surface-active elements (e.g. sulphur) and different gas evolution rates were performed. It was shown that there exist a significant effect of the quality of the sand on the formation of the graphite degeneration layer.

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Solidification of Thin Wall Ductile Iron Castings with Hypereutectic Composition

Cited by 10 publications

References 10 publications

Modelling of Eutectic Saturation Influence on Microstructure in Thin Wall Ductile Iron Casting Using Cellular Automata

Modelling of Eutectic Saturation Influence on Microstructure in Thin Wall Ductile Iron Casting Using Cellular Automata

Archives of Foundry Engineering

Effect of the Quality of Furan Moulding Sand on the Skin Layer of Ductile Iron Castings

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