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

J. Singh, J. Mazumder

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Alloys and coatings for alloys for improved high temperature service life under aggressive atmosphere 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 CO2 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 micro-chemical 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 will report the microstructural development in this laser clad Ni-Fe-Cr-Al-Hf alloy.

Original languageEnglish (US)
Pages (from-to)1995-2003
Number of pages9
JournalActa Metallurgica
Volume35
Issue number8
DOIs
StatePublished - Aug 1987

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Solid solutions
Laser cladding
Microstructure
Lasers
Scanning electron microscopy
Metastable phases
Grain refinement
Microstructural evolution
Electron probe microanalysis
Auger electron spectroscopy
Service life
Powders
Precipitates
Solubility
Transmission electron microscopy
Scanning
Coatings
Electrons
Chemical analysis
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "Alloys and coatings for alloys for improved high temperature service life under aggressive atmosphere 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 CO2 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 micro-chemical 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 will report the microstructural development in this laser clad Ni-Fe-Cr-Al-Hf alloy.",
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Effect of extended solid solution of Hf on the microstructure of the laser clad Ni-Fe-Cr-Al-Hf alloys. / Singh, J.; Mazumder, J.

In: Acta Metallurgica, Vol. 35, No. 8, 08.1987, p. 1995-2003.

Research output: Contribution to journalArticle

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