Tungsten Carbide Powder Inserts in Ductile Iron

Duarte, Liliana I.; Lourenço, Nuno M. T.; Santos, Henrique; Santos, J.N.; Sá, Carla

doi:10.4028/www.scientific.net/msf.455-456.267

Cited by 6 publications

(7 citation statements)

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“…Another important contribution to the increased performance of the inserted material is the higher hardness of its matrix relatively to the non inserted one. In fact, as presented in previous work [2], the base metal shows a hardness number close to 250 VHN/4.9N, whilst the hardness of the inserted material is in the range from 400 to 500 VHN/4.9N along 2.5 mm; this higher hardness is surely coresponsible for the less intense abrasive action during the wear test. A ductile iron with a tungsten carbide powder insert has shown a superior wear resistance, measured according to the rubber wheel test, relatively to a non inserted material.…”

Section: Discussionsupporting

confidence: 74%

“…A continuous effort is being devoted to study the feasibility of improving the wear resistance of ductile iron components, through an insertion of a hard metal powder layer, during the casting process. A first task concerning the definition of the procedures leading to a sound insert, composed of a metallic matrix with an important fraction of tungsten carbide particles, has been overcome [1,2]. It becomes important to evaluate the performance of the inserted metal when subjected to wear.…”

Section: Introductionmentioning

confidence: 99%

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Wear Resistance of Powder Hard Metal Inserted Ductile Iron

Lourenço

Santos²

2006

MSF

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A continuous effort is being devoted to study the feasibility of improving the wear resistance of ductile iron components through an insertion of a hard metal powder layer during the casting process. Tests have been run to evaluate the wear resistance of the inserted material, compared to a non inserted ductile iron. The tests have been run in accordance with ASTM G65-94, which specifies the so-called rubber wheel test. Three different kinds of material have been tested: a non inserted ductile iron, an inserted ductile iron in the as-cast state and an inserted ductile iron with a rectified surface. The tests have been run gradually; each test piece has been taken out from the test apparatus and weighted at different intervals, from 200 to 6400 wheel revolutions (or 0.1 to 4.4 km of sliding distance); the results obtained show that the non inserted ductile iron presents a loss of weight fifty percent higher than the inserted material. The analysis of the surface of the test pieces after the wear tests has been run under stereo and scanning electron microscopy. The non inserted ductile iron test piece surface has shown an uniform waviness with a wavelength around half a millimeter and under higher magnification much finer wear marks have been observed. The inserted ductile iron test piece surface has shown the same relief with half a millimeter wavelength but a significant difference has been noticed: the fine wear marks have been observed in the metallic matrix of the insert but they stop in the neighborhood of the tungsten carbide particles, leading the authors to propose that these hard particles remained unchanged until the metallic matrix supporting them has been sufficiently removed to cause the respective extraction; this behavior should explain the smaller weight loss rate of the inserted material.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Wear Resistance of Powder Hard Metal Inserted Ductile Iron

Lourenço

Santos²

2006

MSF

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“…It is chemically similar to molybdenum, but it is inferior to it in terms of use, and also in terms of its influence on the mechanical properties of cast iron. However, due to the rising price of molybdenum, it is being taken into account in special applications [1][2][3]. Tungsten, like molybdenum, is a carbide-forming and pearlitic element.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Myszka,

Kasińska,

Penkul

2021

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The possibilities of producing ductile cast iron with the addition of 1 ÷ 3% of tungsten are presented. Tungsten from waste chips from mechanical processing was introduced into the liquid cast iron in the form of specially prepared cartridges. Correct dissolution of tungsten in the metal bath was found, and there were no casting defects in the alloy. The form of carbide precipitates in the microstructure of cast iron was determined and the influence of increasing tungsten content on the reduction of the number of graphite precipitates in the structure was determined. Impact tests show that this property degrades with increasing tungsten content as opposed to hardness which increases. It was found that the addition of tungsten from machining waste is a potential source of enrichment of cast iron with this element.

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“…This objective may be attained if, during foundry practice, a hard layer of material is inserted in the regions requiring wear resistance. Preliminary approaches making use of mixtures of tungsten carbide (WC) powder as a hard material and sodium silicate (SS) as a binder prove that this is not an impossible task [4,5]. This work focus the SS effect in the mixture with WC and revel what it happens during the filling, in order to obtained a regular insert.…”

Section: Introductionmentioning

confidence: 99%

The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron

Lourenço

Santos²,

Sá³

2008

MSF

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A tungsten carbide insert is produced during ductile iron foundry practice to increase the surface hardness of the material. The insert is ensured with the help of a critical quantity of a binder, around 3 weight percent of sodium silicate, previously mixed with the tungsten carbide powder. The binder is verified to form a film around the tungsten carbide particles and bridges amongst these enveloped particles; these films and bridges are replaced by the ductile iron melt during the molding cavity filling. After solidification, a sound inserted layer is formed, composed of tungsten carbide particles in a tungsten enriched cast iron matrix. In the absence of the binder addition to the tungsten carbide powder no inserted layer is produced. The surface hardness of the inserted test pieces is close to 500VHN/4.9N and the respective thickness is around 2.5 mm. The characterization of the effect of the sodium silicate in the mixture has been the main purpose of this work

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Tungsten Carbide Powder Inserts in Ductile Iron

Cited by 6 publications

References 1 publication

Wear Resistance of Powder Hard Metal Inserted Ductile Iron

Wear Resistance of Powder Hard Metal Inserted Ductile Iron

Archives of Foundry Engineering

The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron

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