Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

John D. DeFouw; David C. Dunand

doi:10.1016/j.msea.2012.07.099

Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

John D. DeFouw^*, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Nickel-base superalloy foams were created by a casting replication technique where a lightly sintered preform of SrF ₂ was pressure infiltrated with molten IN792; after solidification of the composite, the salt phase was dissolved with HCl to create 65% open porosity. Room temperature yield strength and stiffness of the IN792 foam compared well with existing models. Monolithic and foam samples were tested under creep conditions at 750 and 850°C at stresses ranging from 5 to 40MPa for the foams and from 150 to 650MPa for the monolithic alloy. Both exhibited power-law creep behavior at high stresses and a transition to viscous flow at lower stresses, which was modeled using equations for dislocation and diffusional creep.

Original language	English (US)
Pages (from-to)	129-133
Number of pages	5
Journal	Materials Science and Engineering A
Volume	558
DOIs	https://doi.org/10.1016/j.msea.2012.07.099
State	Published - Dec 15 2012

Keywords

Casting
Cellular materials
Mechanical characterization
Nickel based superalloys

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams",

abstract = "Nickel-base superalloy foams were created by a casting replication technique where a lightly sintered preform of SrF 2 was pressure infiltrated with molten IN792; after solidification of the composite, the salt phase was dissolved with HCl to create 65% open porosity. Room temperature yield strength and stiffness of the IN792 foam compared well with existing models. Monolithic and foam samples were tested under creep conditions at 750 and 850°C at stresses ranging from 5 to 40MPa for the foams and from 150 to 650MPa for the monolithic alloy. Both exhibited power-law creep behavior at high stresses and a transition to viscous flow at lower stresses, which was modeled using equations for dislocation and diffusional creep.",

keywords = "Casting, Cellular materials, Mechanical characterization, Nickel based superalloys",

author = "DeFouw, {John D.} and Dunand, {David C.}",

note = "Funding Information: The authors thank Mr. Nirand Pisutha-arnond (Northwestern University, supported in part by an undergraduate research grant from the Ford Motor Company) for assistance with pressure infiltration experiments and microscopy. Part of this research was funded by NASA through a subcontract from GE (award NNC06CB31C ) and supervised by Dr. R. Bhat (GE Global Research Center). ",

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doi = "10.1016/j.msea.2012.07.099",

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AU - DeFouw, John D.

AU - Dunand, David C.

N1 - Funding Information: The authors thank Mr. Nirand Pisutha-arnond (Northwestern University, supported in part by an undergraduate research grant from the Ford Motor Company) for assistance with pressure infiltration experiments and microscopy. Part of this research was funded by NASA through a subcontract from GE (award NNC06CB31C ) and supervised by Dr. R. Bhat (GE Global Research Center).

PY - 2012/12/15

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N2 - Nickel-base superalloy foams were created by a casting replication technique where a lightly sintered preform of SrF 2 was pressure infiltrated with molten IN792; after solidification of the composite, the salt phase was dissolved with HCl to create 65% open porosity. Room temperature yield strength and stiffness of the IN792 foam compared well with existing models. Monolithic and foam samples were tested under creep conditions at 750 and 850°C at stresses ranging from 5 to 40MPa for the foams and from 150 to 650MPa for the monolithic alloy. Both exhibited power-law creep behavior at high stresses and a transition to viscous flow at lower stresses, which was modeled using equations for dislocation and diffusional creep.

AB - Nickel-base superalloy foams were created by a casting replication technique where a lightly sintered preform of SrF 2 was pressure infiltrated with molten IN792; after solidification of the composite, the salt phase was dissolved with HCl to create 65% open porosity. Room temperature yield strength and stiffness of the IN792 foam compared well with existing models. Monolithic and foam samples were tested under creep conditions at 750 and 850°C at stresses ranging from 5 to 40MPa for the foams and from 150 to 650MPa for the monolithic alloy. Both exhibited power-law creep behavior at high stresses and a transition to viscous flow at lower stresses, which was modeled using equations for dislocation and diffusional creep.

KW - Casting

KW - Cellular materials

KW - Mechanical characterization

KW - Nickel based superalloys

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