Cast-Bonding—a New Process for manufacturing Composite Wear Products

Heijkoop, T.; Sare, I.R.

doi:10.1080/09534962.1989.11818997

Cited by 16 publications

(14 citation statements)

References 2 publications

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“…Critical time is given as ….. (3) Therefore, the aim of this paper is to describe a technology of bimetallic castings in a material configuration of White cast iron -ductile cast iron based on the liquid-solid method using a preheated ductile cast iron as die blank. In the presented technology, preheating of inner ring (ductile cast iron) insert was done by pouring liquid melts in direct contact with the inner ring.…”

Section: Research Article Open Accessmentioning

confidence: 99%

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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%

“…In general, the technology of bimetal casting consisting of working surface layer and a base part is achieved based on two systems, i.e. liquid-liquid [1,2] and liquid-solid [3,4].…”

Section: Introductionmentioning

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 idea of the proposed technology of layered casting was taken from the relevant mining industry method of manufacture of composite (alloy) surface layers based on granular inserts from Fe-Cr-C [1,3,4], Fe-Cr-C-Mo [2] oraz Ni-Cr-Fe-C [7] alloy, placed in mould directly before pouring molten metal. Obtained in this way working surface layers have a high hardness and metalmineral wear resistance [1, 3 and 9].…”

Section: Introductionmentioning

confidence: 99%

The Quality of the Joint Between Alloy Steel and Unalloyed Cast Steel in Bimetallic Layered Castings

Wróbel¹

2012

Archives of Foundry Engineering

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In paper is presented technology of bimetallic layered castings based on founding method of layer coating directly in cast process so-called method of mould cavity preparation. Prepared castings consist two fundamental parts i.e. bearing part and working part (layer). The bearing part of bimetallic layered casting is typical foundry material i.e. ferritic-pearlitic unalloyed cast steel, whereas working part (layer) is plate of austenitic alloy steel sort X2CrNi 18-9. The ratio of thickness between bearing and working part is 8:1. The aim of paper was assessed the quality of the joint between bearing and working part in dependence of pouring temperature and carbon concentration in cast steel. The quality of the joint in bimetallic layered castings was evaluated on the basis of ultrasonic non-destructive testing, structure and microhardness researches.

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Cast-Bonding—a New Process for manufacturing Composite Wear Products

Cited by 16 publications

References 2 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

The Quality of the Joint Between Alloy Steel and Unalloyed Cast Steel in Bimetallic Layered Castings

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