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Title: Residual stress determination from a laser-based curvature measurement

Abstract

Thermally sprayed coating characteristics and mechanical properties are in part a result of the residual stress developed during the fabrication process. The total stress state in a coating/substrate is comprised of the quench stress and the coefficient of thermal expansion (CTE) mismatch stress. The quench stress is developed when molten particles impact the substrate and rapidly cool and solidify. The CTE mismatch stress results from a large difference in the thermal expansion coefficients of the coating and substrate material. It comes into effect when the substrate/coating combination cools from the equilibrated deposit temperature to room temperature. This paper describes a laser-based technique for measuring the curvature of a coated substrate and the analysis required to determine residual stress from curvature measurements. Quench stresses were determined by heating the specimen back to the deposit temperature thus removing the CTE mismatch stress. By subtracting the quench stress from the total residual stress at room temperature, the CTE mismatch stress was estimated. Residual stress measurements for thick (>1mm) spinel coatings with a Ni-Al bond coat on 304 stainless steel substrates were made. It was determined that a significant portion of the residual stress results from the quenching stress of the bond coat andmore » that the spinel coating produces a larger CTE mismatch stress than quench stress.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
758128
Report Number(s):
INEEL/CON-99-01176
TRN: AH200021%%177
DOE Contract Number:  
AC07-99ID13727
Resource Type:
Conference
Resource Relation:
Conference: International Thermal Spray Conference (ITSC-2000), Montreal, Quebec (CA), 05/08/2000--05/11/2000; Other Information: PBD: 8 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SPRAYED COATINGS; RESIDUAL STRESSES; SUBSTRATES; THERMAL EXPANSION; QUENCHING; DIAGNOSTIC TECHNIQUES; NICKEL; ALUMINIUM; STAINLESS STEEL-304; SPINELS; SPRAYED COATING; MECHANICAL PROPERTIES; RESIDUAL STRESS; COEFFICIENT OF THERMAL EXPANSION (CTE) MISMATCH STRESS; MOLTEN PARTICLES; CURVATURE; COATED SUBSTRATE; QUENCHING STRESS; SPINEL COATING

Citation Formats

W. D. Swank, R. A. Gavalya, J. K. Wright, and R. N. Wright. Residual stress determination from a laser-based curvature measurement. United States: N. p., 2000. Web.
W. D. Swank, R. A. Gavalya, J. K. Wright, & R. N. Wright. Residual stress determination from a laser-based curvature measurement. United States.
W. D. Swank, R. A. Gavalya, J. K. Wright, and R. N. Wright. Mon . "Residual stress determination from a laser-based curvature measurement". United States. https://www.osti.gov/servlets/purl/758128.
@article{osti_758128,
title = {Residual stress determination from a laser-based curvature measurement},
author = {W. D. Swank and R. A. Gavalya and J. K. Wright and R. N. Wright},
abstractNote = {Thermally sprayed coating characteristics and mechanical properties are in part a result of the residual stress developed during the fabrication process. The total stress state in a coating/substrate is comprised of the quench stress and the coefficient of thermal expansion (CTE) mismatch stress. The quench stress is developed when molten particles impact the substrate and rapidly cool and solidify. The CTE mismatch stress results from a large difference in the thermal expansion coefficients of the coating and substrate material. It comes into effect when the substrate/coating combination cools from the equilibrated deposit temperature to room temperature. This paper describes a laser-based technique for measuring the curvature of a coated substrate and the analysis required to determine residual stress from curvature measurements. Quench stresses were determined by heating the specimen back to the deposit temperature thus removing the CTE mismatch stress. By subtracting the quench stress from the total residual stress at room temperature, the CTE mismatch stress was estimated. Residual stress measurements for thick (>1mm) spinel coatings with a Ni-Al bond coat on 304 stainless steel substrates were made. It was determined that a significant portion of the residual stress results from the quenching stress of the bond coat and that the spinel coating produces a larger CTE mismatch stress than quench stress.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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