Ultrasonic evaluation of creep damage of high temperature metallic materials with different microstructures

Jai Won Byeon; J. H. Song; S. I. Kwun

doi:10.4028/www.scientific.net/kem.270-273.120

Ultrasonic evaluation of creep damage of high temperature metallic materials with different microstructures

Jai Won Byeon, J. H. Song, S. I. Kwun

Dept. of Mechanical Convergence Engineering

Korea University

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

The creep damage levels of two metallic materials (PM1000 and IN738LC Ni based superalloy), which had different microstructures and creep damage mechanism, were evaluated by ultrasonic velocity and attenuation measurement. In case of PM1000 alloy, the ultrasonic velocity decreased with increasing creep time, which was mainly attributed to the decrease of Young's modulus due to the increasing volume fraction of creep cavity. Ultrasonic attenuation coefficient increased with increasing creep time in IN738LC alloy, while ultrasonic velocity showed no distinct trend. This increase of ultrasonic attenuation was attributed to the directional coarsening (rafting) of γ' precipitates. A linear correlation was found between attenuation coefficient and mean length of γ' precipitates.

Original language	English
Pages (from-to)	120-125
Number of pages	6
Journal	Key Engineering Materials
Volume	270-273
Issue number	I
DOIs	https://doi.org/10.4028/www.scientific.net/kem.270-273.120
State	Published - 2004
Event	Proceedings of the 11th Asian Pacific Conference on Nondestructive Testing - Jeju Island, Korea, Republic of Duration: 3 Nov 2003 → 7 Nov 2003

Keywords

Attenuation
Creep damage
Microstructure
Rafting
Ultrasonic velocity

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title = "Ultrasonic evaluation of creep damage of high temperature metallic materials with different microstructures",

abstract = "The creep damage levels of two metallic materials (PM1000 and IN738LC Ni based superalloy), which had different microstructures and creep damage mechanism, were evaluated by ultrasonic velocity and attenuation measurement. In case of PM1000 alloy, the ultrasonic velocity decreased with increasing creep time, which was mainly attributed to the decrease of Young's modulus due to the increasing volume fraction of creep cavity. Ultrasonic attenuation coefficient increased with increasing creep time in IN738LC alloy, while ultrasonic velocity showed no distinct trend. This increase of ultrasonic attenuation was attributed to the directional coarsening (rafting) of γ' precipitates. A linear correlation was found between attenuation coefficient and mean length of γ' precipitates.",

keywords = "Attenuation, Creep damage, Microstructure, Rafting, Ultrasonic velocity",

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journal = "Key Engineering Materials",

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T1 - Ultrasonic evaluation of creep damage of high temperature metallic materials with different microstructures

AU - Byeon, Jai Won

AU - Song, J. H.

AU - Kwun, S. I.

PY - 2004

Y1 - 2004

N2 - The creep damage levels of two metallic materials (PM1000 and IN738LC Ni based superalloy), which had different microstructures and creep damage mechanism, were evaluated by ultrasonic velocity and attenuation measurement. In case of PM1000 alloy, the ultrasonic velocity decreased with increasing creep time, which was mainly attributed to the decrease of Young's modulus due to the increasing volume fraction of creep cavity. Ultrasonic attenuation coefficient increased with increasing creep time in IN738LC alloy, while ultrasonic velocity showed no distinct trend. This increase of ultrasonic attenuation was attributed to the directional coarsening (rafting) of γ' precipitates. A linear correlation was found between attenuation coefficient and mean length of γ' precipitates.

AB - The creep damage levels of two metallic materials (PM1000 and IN738LC Ni based superalloy), which had different microstructures and creep damage mechanism, were evaluated by ultrasonic velocity and attenuation measurement. In case of PM1000 alloy, the ultrasonic velocity decreased with increasing creep time, which was mainly attributed to the decrease of Young's modulus due to the increasing volume fraction of creep cavity. Ultrasonic attenuation coefficient increased with increasing creep time in IN738LC alloy, while ultrasonic velocity showed no distinct trend. This increase of ultrasonic attenuation was attributed to the directional coarsening (rafting) of γ' precipitates. A linear correlation was found between attenuation coefficient and mean length of γ' precipitates.

KW - Attenuation

KW - Creep damage

KW - Microstructure

KW - Rafting

KW - Ultrasonic velocity

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DO - 10.4028/www.scientific.net/kem.270-273.120

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AN - SCOPUS:8644221306

SN - 1013-9826

VL - 270-273

SP - 120

EP - 125

JO - Key Engineering Materials

JF - Key Engineering Materials

IS - I

T2 - Proceedings of the 11th Asian Pacific Conference on Nondestructive Testing

Y2 - 3 November 2003 through 7 November 2003

ER -

Ultrasonic evaluation of creep damage of high temperature metallic materials with different microstructures

Abstract

Keywords

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