Effect of extended solid solution of Hf on the microstructure of the laser clad Ni-Fe-Cr-Al-Hf alloys

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:7161596

Singh, J; Mazumder, J

Alloys and coatings for alloys for improved high-temperature service life under aggressive atmospheres are of great contemporary interest. There is a general consensus that addition of reactive elements such as Hf will provide many beneficial effects for such alloys. The laser cladding technique was used to produce Ni-Fe-Cr-Al-Hf alloys with extended solid solution of Hf. A 10-kW CO/sub 2/ laser with mixed powder feed was used for laser cladding. Optical, scanning electron (SEM) and scanning transmission electron (STEM) microscopy were employed for microstructural evolution of alloys produced during laser-cladding processes. The electron probe microanalysis and the Auger electron spectroscopy were also used for microchemical analysis of different phases. Microstructural studies revealed a high degree of grain refinement, considerable increase in solubility of Hf in matrix, and Hf-rich precipitates and new metastable phases. This paper reports the microstructural development in this laser-clad Ni-Fe-Cr-Al-Hf alloy.

• Research Organization: Illinois Univ., Urbana (USA). Laser Aided Materials Processing Lab.
• OSTI ID: 7161596
• Report Number(s): AD-A-191460/5/XAB
• Resource Relation: Other Information: Pub. in Acta Metallurgica, Vol. 35, No. 8, 1995-2003(1987)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CLADDING
HAFNIUM ALLOYS
HEAT RESISTING ALLOYS
LASER RADIATION
PHYSICAL RADIATION EFFECTS
NICKEL ALLOYS
PROTECTIVE COATINGS
AUGER ELECTRON SPECTROSCOPY
BONDING
CARBON DIOXIDE LASERS
CHROMIUM ALLOYS
ELECTRON PROBES
IRON ALLOYS
MICROANALYSIS
MICROSCOPY
MICROSTRUCTURE
POWDERS
SOLID SOLUTIONS
SOLUBILITY
ALLOYS
COATINGS
CRYSTAL STRUCTURE
DEPOSITION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
FABRICATION
GAS LASERS
HEAT RESISTANT MATERIALS
JOINING
LASERS
MATERIALS
MIXTURES
PROBES
RADIATION EFFECTS
RADIATIONS
SOLUTIONS
SPECTROSCOPY
SURFACE COATING
360105* - Metals & Alloys- Corrosion & Erosion