The Impact of Ceramic Shell Strength on Hot Tearing during Investment Casting

Journal Article · Mon Jan 17 00:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3552524· OSTI ID:21510187

Norouzi, Saeid ^[1]; Farhangi, Hassan ^[2]

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1. MAPNA GROUP Co (Iran, Islamic Republic of)
2. School of Metallurgy and Materials Engineering, University of Tehran (Iran, Islamic Republic of)

The effect of ceramic shell strength on hot tearing susceptibility during solidification was inspected practicing investment casting of the cobalt-base superalloy samples with the same casting conditions, but different ceramic shell systems. Results showed that the lower the ceramic shell strength upon using polymer additives, the lower the hindered contraction rate, and the lower the hindered contraction rate, the smaller the hot tearing tendency. Optical microscopy and electron microscopy scanning revealed that the hot tear propagated along the last solidified interdendritic phase, and that the hot tear surface had two major modes: (1) the ductile region in the outer layer; and (2) the inner region of liquid embrittlement.

• OSTI ID: 21510187
• Journal Information: AIP Conference Proceedings, Vol. 1315, Issue 1; Conference: AMPT2010: International conference on advances in materials and processing technologies, Paris (France), 24-27 Oct 2010; Other Information: DOI: 10.1063/1.3552524; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADDITIVES
CASTING
CERAMICS
COBALT
EMBRITTLEMENT
FRACTURES
HEAT RESISTING ALLOYS
LAYERS
MAGNETIC SUSCEPTIBILITY
OPTICAL MICROSCOPY
POLYMERS
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
SURFACES
ALLOYS
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
FAILURES
HEAT RESISTANT MATERIALS
MAGNETIC PROPERTIES
MATERIALS
METALS
MICROSCOPY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TRANSITION ELEMENTS