Characterization of Bimetallic Castings with an Austenitic Working Surface Layer and an Unalloyed Cast Steel Base

Wróbel, T.

doi:10.1007/s11665-014-0953-4

Cited by 40 publications

(29 citation statements)

References 11 publications

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“…The mechanical strength of bonding between two materials will be achieved through the formation of metallurgical bonding at the interface of both material [7] The proper temperature of preheating and the contact interfacetemperature were the concern of this work. The interface temperature should range between 50% up to 70% of the lowest liquid temperature of both material, due to facilitate the diffusion process [8].…”

Section: Research Article Open Accessmentioning

confidence: 99%

Gravity Sand Casting of Metallurgical Bonded Bimetallic Grinding Roll Made of White Cast Iron-Nodular Cast Iron

Purwadi¹

2017

IJERA

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Bimetallic castings are widely used in the mining industries as construction material for crushers which have to perform high abrasive resistance at the outer side and excellent machinability at the inner side. To manufacture bimetallic casting goods cconsecutive centrifugal and gravity casting methods are commonly applied. Centrifugal and consecutive casting come up with geometrical constraints at the parting line of both materials. This research dealed with the manufacturing of tapered grinding roll by applying gravity casting method. The possibilities of casting the white cast iron outer ring in the preheated ductile cast iron of the inner ring were investigated. The inner ring was first heated up by casting liquid metal around the inner side, which prevented the inner ring from cracking due to rapid expansion during the casting process and to provide adequyate shrinkage of inner ring during solidification. After achieving the desired temperature of the inner ring, the liquid metal of white cast iron was then poured into the cavity to form the outer ring. The preheating temperature of the inner ring was mainly derived from the linear thermal expansion of both quasi isotrophic material and the diffusion at the parting line. This preheating temperature has to facilitate the formation of metallurgical bonding and avoid cracks due to the difference of shrinkage value between inner and outer ring. The preheating temperature was set up in the range of 500°C -1000 °C and the flushing time was fixed for 7 seconds. Studies on the microstructure of sample material have revealed a formation of metallurgical bonding at all of the preheating temperature. The width of the diffusion at the interface area varied between 291 µm at 500 o C preheating temperature, 301 µm at 625 o C, 834,8 µm at 750 °C, 909,1 µm at 875 °C and 1027,7 µm at 1000 °C. By preheating temperature of higher than 750°C fusion occured at the interface area between inner and outer material. This research concludes that the casting of bimetallic by applying gravity casting method can be done by preheating the inner ring to 625 o C, interface temperature of 1150 o C, flushing time of 7 seconds and pouring the white cast iron outer ring at the temperature of 1430 o C

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Section: Research Article Open Accessmentioning

confidence: 99%

Gravity Sand Casting of Metallurgical Bonded Bimetallic Grinding Roll Made of White Cast Iron-Nodular Cast Iron

Purwadi¹

2017

IJERA

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“…Therefore, this technology can be significantly competitive for the commonly used technologies of surfacing by welding and thermal spraying because, in addition to its economic advantages, it does not generate opportunities for the development of cracks in the heat-affected zone that may arise as a result of making the layer by using the welding method. In general, the technology of cast bimetals containing a working layer and a base part is carried out based on two systems; i.e., liquid-liquid [1,2] and liquid-solid [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. An example of the former is a technology in which two independent gating systems are made, which guarantees a two-stage filling of the sand mold cavity.…”

Section: Introductionmentioning

confidence: 99%

“…The basis technology of layered castings made in a liquid-solid system is the so-called method of mold cavity preparation. In this manufacturing method, the element enriching the surface of the casting is placed in the mold in the form of a granular [3][4][5][6][7][8][9] or monolithic [10][11][12][13][14][15][16] insert directly before the molten metal is poured. Therefore, this paper presents possibilities of using a Cr-base alloy as a granular insert and high-chromium and chromium-nickel alloy steels as monolithic inserts.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing Methods of Alloy Layers on Casting Surfaces

Szajnar

Wróbel

Dulska

2017

jcme

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In this paper, we presented the technology of layered castings based on the founding method of layer coating directly in the cast process known as the method of mold cavity preparation by monolithic or granular material of insert. Prepared castings consist of two fundamental parts: the base part and working part (layer). The base part of a layered casting is usually typical foundry material (i.e., pearlitic grey cast iron with flake graphite or ferritic-pearlitic carbon cast steel), whereas the dependence of an insert type (i.e., monolithic or granular) working part (layer) is suitably plated with ferritic and austenitic alloy steels or a layer from a Cr-base alloy. The ratio of thickness between the base and working part is between 8:1 and 10:1. The quality of the layered castings was evaluated on the basis of ultrasonic non-destructive testing, structure, and selected usable property research. According to work out technology, the prepared layered castings can work in conditions that require high heat resistance and/or corrosion resistance from the working surface layer of an element in a medium of industrial water, for example. Moreover, in the case of applying an insert based on Cr-base alloy powder on the working surface layer, it is possible to obtain high hardness and abrasive wear resistance.

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“…The aim of the alloy layer forming process on castings [1][2][3][4][5][6] is to obtain a considerable increase in the parameters of the effective surface area [7][8][9][10]. Many of the properties of such castings depend on the physical and chemical properties of surface layers, e.g.…”

Section: Introductionmentioning

confidence: 99%

Description Of Alloy Layer Formation On A Cast Steel Substrate

Szajnar¹,

Dulska²,

Wróbel³

et al. 2015

Archives of Metallurgy and Materials

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A description of alloy layer formation on a steel substrate is presented. Two types of formation are considered: diffusion of carbon and chromium into the solid from the pad in the direction of the cast steel within the FeCrC (grains) and diffusion in a layer of liquid chromium cast iron formed in a preceding step. The influence of silicon in the pad on the pad's transformation into the liquid is also examined. Solidus and liquidus temperatures of high carbon ferrochromium are determined. The larger the content of Si is used in the experiment, the lower the solidus temperature of the FeCrC alloy is observed. This results from the higher intensity of the elements' diffusion and faster formation of the liquid.Keywords: alloy layer, cast steel, FeCrC -alloy, diffusion W pracy przedstawiono autorski opis procesu powstawania powierzchniowej warstwy stopowej, którego istota opiera się na dyfuzji w stanie stałym węgla i chromu z wkładki w stronę staliwa w obrębie ziaren FeCrC, jak również na dyfuzji w warstwie ciekłego żeliwa chromowego powstałego w wcześniejszych etapach tworzenia się warstwy w wyniku dyfuzji w stanie stałym. Zbadano również wpływ dodatku krzemu w materiale wkładki stopowej na proces przejścia jej w stan ciekły. Określono temperaturę likwidus i solidus żelazochromu wysokowęglowego mającą wpływ na ten proces. Stwierdzono, że zwiększona zawartość Si powoduje obniżenie temperatury solidus stopu FeCrC co jest powodem zwiększenia szybkości dyfundujących składników, co z kolei prowadzi do szybszego powstania fazy ciekłej.

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Characterization of Bimetallic Castings with an Austenitic Working Surface Layer and an Unalloyed Cast Steel Base

Cited by 40 publications

References 11 publications

Gravity Sand Casting of Metallurgical Bonded Bimetallic Grinding Roll Made of White Cast Iron-Nodular Cast Iron

Gravity Sand Casting of Metallurgical Bonded Bimetallic Grinding Roll Made of White Cast Iron-Nodular Cast Iron

Manufacturing Methods of Alloy Layers on Casting Surfaces

Description Of Alloy Layer Formation On A Cast Steel Substrate

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