Production of High-Quality Castings from Gray Iron by Differentiated Cooling in Iron Mould

Gabelchenko, N. I.; Belov, A. A.; Meshcheryakova, Oksana N.

doi:10.4028/www.scientific.net/msf.973.15

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Unidirectional variation of the cooling rate of metal casting is widely practically used to obtain the required results [11][12][13][14][15][16]. If the cooling rate is increased, forming of cementite eutectics is very possible, what can lead to chilling.…”

Section: Introductionmentioning

confidence: 99%

Improvement of mechanical properties of iron castings via adjusting of solidification rate

Gabelchenko¹,

Belov²,

Kidalov³

et al. 2020

cisisr

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The work is devoted to improvement of mechanical properties of iron castings via adjusting of the cooling rate without introduction of alloying additives. The new technological solution is suggested; it can be easily adapted to a casting technology. This solution is based on variation of the cooling rate of iron castings within structurally sensitive solidification intervals. For this purpose, the casting mould was initially cooled after pouring, then heated and cooled again. Cooling of the mould during the period of primary austenite crystal forming led to increase of dendrite crystallization rate and was executed using compressed air. Retarding of the cooling rate during the period of eutectic transformation was provided by the mould heating via burning of exothermic carbon-containing additives introduced in a facing layer of sand-clay moulding mix. Burning reaction is accompanied by heat extraction, what steeply retarded the cooling rate within the interval of eutectic transformation. Consequent acceleration of castings cooling within the interval of eutectoid transformation was achieved via repeated air blowing through a worked reaction layer. Adjusted cooling of iron castings allowed to provide the most favourable solidification conditions, taking into account strictly individual requirements for each structurally sensitive temperature intervals. It led to increase of a volumetric part of primary austenite dendrite crystals, to decrease of eutectic transformation overcooling degree, to forming of graphite eutectics and enlargement of dispersity of pearlite component in iron. Consequently, lowering of widespread iron castings rejects takes place, among them chilling, with simultaneous improvement of metal mechanical properties. As a result, the primary and real structures were varied, what had a positive effect on mechanical properties of casting metal. It is shown that use of solidification rate adjustment led to essential increase of metal tensile strength for the experimental casting.

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Section: Introductionmentioning

confidence: 99%

Improvement of mechanical properties of iron castings via adjusting of solidification rate

Gabelchenko¹,

Belov²,

Kidalov³

et al. 2020

cisisr

View full text Add to dashboard Cite

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Research of the Influence of Slow-Down Cooling Speed in the Interval of Eutektic Transformation on the Structure and Mechanical Properties of Cast Iron Castings

et al. 2020

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The work is devoted to the study of the effect of slowing down the cooling rate in the interval of eutectic transformation on the structure and mechanical properties of castings from gray doeutectic iron. To slow down the cooling rate in the interval of eutectic transformation, an exothermic carbon-containing additive, fuel oil M-100, was used. It is shown that the use of controlled cooling can significantly increase the quality index of cast iron without introducing additional alloying elements into the composition of cast iron.

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Production of High-Quality Castings from Gray Iron by Differentiated Cooling in Iron Mould

Abstract: The paper considers the possibility of improving the quality of gray cast iron castings by controlling the cooling rate of castings in a mold. It is shown that the use of differentiated cooling can increase tensile strength of cast iron by 12-16%

Cited by 2 publications

References 5 publications

Improvement of mechanical properties of iron castings via adjusting of solidification rate

Improvement of mechanical properties of iron castings via adjusting of solidification rate

Research of the Influence of Slow-Down Cooling Speed in the Interval of Eutektic Transformation on the Structure and Mechanical Properties of Cast Iron Castings

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