Solidification structure of stellite overlayer formed on spheroidal graphite cast iron by plasma transferred arc process

W. S. Chan, Truan-Sheng Lui, L. H. Chen

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The solidification structures of the overlayers of stellite 1, 6 and 21 cobalt base alloys after overlaid on spheroidal graphite cast iron by plasma transferred arc process were studied in this investigation. The results of low overlaying current (I = 60 A) indicated that the stellite 1 overlayer is dendriteless with large amount of M7C3 and M23C6 carbides, which is different from the dendritic structure of the stellite 6 and 21 overlayers. The interdendritic precipitates of the stellite 6 overlayer are M7C3 and M23C6, whereas those of the stellite 21 overlayer are σ phase and very fine M23C6 carbide. An interfacial layer exists between the overlayer and the base material. Dilution of the overlay material by the base material is responsible for the formation of this layer. The overlayers are rich in iron content when the overlaying current is high (I = 100 A). Under this situation, the solidification structure of the stellite 1 overlayer is dendriteless while that of the stellite 6 and 21 is dendritic. Regardless of this microstructure difference, all of the overlayers consist of M7C3 carbide in blocky and colony shape, and M23C6 carbide in fishbone shape. Owing to the dilution effect, the matrix of the overlayers is α-Fe with lamellar M7C3 carbide.

Original languageEnglish
Pages (from-to)529-537
Number of pages9
JournalMaterials Transactions, JIM
Volume35
Issue number8
DOIs
Publication statusPublished - 1994 Jan 1

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Stellite (trademark)
Stellite
Graphite
Cast iron
solidification
Solidification
casts
arcs
graphite
carbides
Plasmas
iron
Carbides
Dilution
dilution
low currents
Cobalt
high current
Precipitates
precipitates

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "The solidification structures of the overlayers of stellite 1, 6 and 21 cobalt base alloys after overlaid on spheroidal graphite cast iron by plasma transferred arc process were studied in this investigation. The results of low overlaying current (I = 60 A) indicated that the stellite 1 overlayer is dendriteless with large amount of M7C3 and M23C6 carbides, which is different from the dendritic structure of the stellite 6 and 21 overlayers. The interdendritic precipitates of the stellite 6 overlayer are M7C3 and M23C6, whereas those of the stellite 21 overlayer are σ phase and very fine M23C6 carbide. An interfacial layer exists between the overlayer and the base material. Dilution of the overlay material by the base material is responsible for the formation of this layer. The overlayers are rich in iron content when the overlaying current is high (I = 100 A). Under this situation, the solidification structure of the stellite 1 overlayer is dendriteless while that of the stellite 6 and 21 is dendritic. Regardless of this microstructure difference, all of the overlayers consist of M7C3 carbide in blocky and colony shape, and M23C6 carbide in fishbone shape. Owing to the dilution effect, the matrix of the overlayers is α-Fe with lamellar M7C3 carbide.",
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Solidification structure of stellite overlayer formed on spheroidal graphite cast iron by plasma transferred arc process. / Chan, W. S.; Lui, Truan-Sheng; Chen, L. H.

In: Materials Transactions, JIM, Vol. 35, No. 8, 01.01.1994, p. 529-537.

Research output: Contribution to journalArticle

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AB - The solidification structures of the overlayers of stellite 1, 6 and 21 cobalt base alloys after overlaid on spheroidal graphite cast iron by plasma transferred arc process were studied in this investigation. The results of low overlaying current (I = 60 A) indicated that the stellite 1 overlayer is dendriteless with large amount of M7C3 and M23C6 carbides, which is different from the dendritic structure of the stellite 6 and 21 overlayers. The interdendritic precipitates of the stellite 6 overlayer are M7C3 and M23C6, whereas those of the stellite 21 overlayer are σ phase and very fine M23C6 carbide. An interfacial layer exists between the overlayer and the base material. Dilution of the overlay material by the base material is responsible for the formation of this layer. The overlayers are rich in iron content when the overlaying current is high (I = 100 A). Under this situation, the solidification structure of the stellite 1 overlayer is dendriteless while that of the stellite 6 and 21 is dendritic. Regardless of this microstructure difference, all of the overlayers consist of M7C3 carbide in blocky and colony shape, and M23C6 carbide in fishbone shape. Owing to the dilution effect, the matrix of the overlayers is α-Fe with lamellar M7C3 carbide.

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