Mechanical and Physical Properties of HVOF-Sprayed Iron Aluminide Coatings

Journal Article · Wed Oct 01 04:00:00 EDT 2003 · Metallurgical and Materials Transactions A

DOI:https://doi.org/10.1007/s11661-003-0286-7· OSTI ID:912030

Totemeier, Terry Craig; Wright, Richard Neil; Swank, William David

Tensile tests and thermal-expansion measurements were performed on free-standing, high-velocity oxy-fuel (HVOF) sprayed Fe3Al coatings produced at spray-particle velocities of 390, 560, and 620 m/s. To examine the relationship between properties and spray conditions, the microstructures of the coatings were characterized in terms of the fractions of unmelted particles, porosity, and oxide inclusions, as well as the dislocation density assessed by X-ray diffraction (XRD) line-broadening analysis. Residual coating stresses were determined as a function of coating thickness using curvature measurements. The tensile behavior was entirely brittle at room temperature; fracture strengths increased with spray-particle velocity; and the increase in fracture-strength results from decreasing fractions of microstructural defects and better interparticle bonding. The mean thermal-expansion coefficients for the coatings were lower than those for an equivalent wrought material; the differences were attributed to a 7 to 15 vol pct fraction of oxide inclusions.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 912030
• Report Number(s): INEEL/JOU-02-00323
• Journal Information: Metallurgical and Materials Transactions A, Journal Name: Metallurgical and Materials Transactions A Journal Issue: 10 Vol. 34; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
BONDING
COATINGS
DEFECTS
DISLOCATIONS
FRACTURE PROPERTIES
IRON
LINE BROADENING
OXIDES
PHYSICAL PROPERTIES
POROSITY
STRESSES
THERMAL EXPANSION
THICKNESS
VELOCITY
X-RAY DIFFRACTION
high-velocity oxy-fuel
tensile tests
thermal-expansion