Solidification structures in overlaying of cobalt-based superalloy on ferritic spheroidal graphite cast irons by plasma transferred arc process

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

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5 Citations (Scopus)

Abstract

When spheroidal graphite (SG) cast iron is overlaid with Stellite 1 cobalt-based superalloy by a plasma transferred arc melting process, a carbide-containing interfacial layer can exist between the substrate and the overlayer. Meanwhile, ledeburite can occur in the partially melted zone of the substrate. These microstructures may cause damage during application and thus are undesirable. In the present investigation, Stellite 1 alloy was overlaid on seven ferritic SG cast irons of various silicon content (2.0 to 3.9 mass%) and carbon content (1.5 to 3.8 mass%) under the same overlaying condition (current: 60 A; voltage: 26 V). The purpose was to characterize the solidification structure with special emphasis on the interface region and the partially melted zone. The results indicate that the overlayer is hypereutectic. The carbide-containing interfacial layer can be eliminated by reducing the carbon content of the substrate. Both reducing the carbon content and increasing silicon content can reduce the amount of ledeburite formed in the partially melted zone. The formation of the ledeburite can be avoided if the silicon content is sufficiently large.

Original languageEnglish
Pages (from-to)50-55
Number of pages6
JournalMaterials Transactions, JIM
Volume37
Issue number1
DOIs
Publication statusPublished - 1996 Jan 1

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Graphite
heat resistant alloys
Silicon
Cobalt
Superalloys
Cast iron
Stellite
solidification
Solidification
casts
cobalt
Carbon
arcs
graphite
Plasmas
iron
Carbides
Plasma arc melting
Substrates
Stellite (trademark)

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "When spheroidal graphite (SG) cast iron is overlaid with Stellite 1 cobalt-based superalloy by a plasma transferred arc melting process, a carbide-containing interfacial layer can exist between the substrate and the overlayer. Meanwhile, ledeburite can occur in the partially melted zone of the substrate. These microstructures may cause damage during application and thus are undesirable. In the present investigation, Stellite 1 alloy was overlaid on seven ferritic SG cast irons of various silicon content (2.0 to 3.9 mass{\%}) and carbon content (1.5 to 3.8 mass{\%}) under the same overlaying condition (current: 60 A; voltage: 26 V). The purpose was to characterize the solidification structure with special emphasis on the interface region and the partially melted zone. The results indicate that the overlayer is hypereutectic. The carbide-containing interfacial layer can be eliminated by reducing the carbon content of the substrate. Both reducing the carbon content and increasing silicon content can reduce the amount of ledeburite formed in the partially melted zone. The formation of the ledeburite can be avoided if the silicon content is sufficiently large.",
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AU - Chan, W. S.

AU - Lui, Truan-Sheng

AU - Chen, L. H.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - When spheroidal graphite (SG) cast iron is overlaid with Stellite 1 cobalt-based superalloy by a plasma transferred arc melting process, a carbide-containing interfacial layer can exist between the substrate and the overlayer. Meanwhile, ledeburite can occur in the partially melted zone of the substrate. These microstructures may cause damage during application and thus are undesirable. In the present investigation, Stellite 1 alloy was overlaid on seven ferritic SG cast irons of various silicon content (2.0 to 3.9 mass%) and carbon content (1.5 to 3.8 mass%) under the same overlaying condition (current: 60 A; voltage: 26 V). The purpose was to characterize the solidification structure with special emphasis on the interface region and the partially melted zone. The results indicate that the overlayer is hypereutectic. The carbide-containing interfacial layer can be eliminated by reducing the carbon content of the substrate. Both reducing the carbon content and increasing silicon content can reduce the amount of ledeburite formed in the partially melted zone. The formation of the ledeburite can be avoided if the silicon content is sufficiently large.

AB - When spheroidal graphite (SG) cast iron is overlaid with Stellite 1 cobalt-based superalloy by a plasma transferred arc melting process, a carbide-containing interfacial layer can exist between the substrate and the overlayer. Meanwhile, ledeburite can occur in the partially melted zone of the substrate. These microstructures may cause damage during application and thus are undesirable. In the present investigation, Stellite 1 alloy was overlaid on seven ferritic SG cast irons of various silicon content (2.0 to 3.9 mass%) and carbon content (1.5 to 3.8 mass%) under the same overlaying condition (current: 60 A; voltage: 26 V). The purpose was to characterize the solidification structure with special emphasis on the interface region and the partially melted zone. The results indicate that the overlayer is hypereutectic. The carbide-containing interfacial layer can be eliminated by reducing the carbon content of the substrate. Both reducing the carbon content and increasing silicon content can reduce the amount of ledeburite formed in the partially melted zone. The formation of the ledeburite can be avoided if the silicon content is sufficiently large.

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