The improvement of corrosion resistance of sensitized alloy 82 welds using laser surface melting

Hwa-Teng Lee, Te Chen Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The corrosion resistance of sensitized Alloy 82 welds is improved by laser surface melting (LSM) with a continuous CO2 laser beam. The effects of the LSM treatment on the segregation of impurities in the matrix and the precipitation of carbides at the grain boundaries are systematically explored. The observation results show that the LSM process results in the formation of a rapidly solidified surface layer with a thickness of approximately 160-180 μm. In addition, the corrosion test results show that the LSM treatment improves the resistance of the weld to both intergranular corrosion (IGC) and pitting corrosion. The improved corrosion resistance can be attributed to a higher proportion of low-Angle boundaries (2∼15°) in the solidified microstructure, the elimination of Cr-carbide precipitates in the matrix, and the suppression of Cr-depletion zones at the grain boundaries. Overall, the results confirm the effectiveness of LSM treatment for the in-situ repair and corrosion resistance restoration of Alloy 82 welds.

Original languageEnglish
Pages (from-to)1329-1336
Number of pages8
JournalMaterials Transactions
Volume58
Issue number9
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

corrosion resistance
Corrosion resistance
Welds
Melting
melting
Lasers
lasers
carbides
Corrosion
grain boundaries
Carbides
intergranular corrosion
Grain boundaries
corrosion tests
pitting
matrices
restoration
precipitates
elimination
Pitting

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "The corrosion resistance of sensitized Alloy 82 welds is improved by laser surface melting (LSM) with a continuous CO2 laser beam. The effects of the LSM treatment on the segregation of impurities in the matrix and the precipitation of carbides at the grain boundaries are systematically explored. The observation results show that the LSM process results in the formation of a rapidly solidified surface layer with a thickness of approximately 160-180 μm. In addition, the corrosion test results show that the LSM treatment improves the resistance of the weld to both intergranular corrosion (IGC) and pitting corrosion. The improved corrosion resistance can be attributed to a higher proportion of low-Angle boundaries (2∼15°) in the solidified microstructure, the elimination of Cr-carbide precipitates in the matrix, and the suppression of Cr-depletion zones at the grain boundaries. Overall, the results confirm the effectiveness of LSM treatment for the in-situ repair and corrosion resistance restoration of Alloy 82 welds.",
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The improvement of corrosion resistance of sensitized alloy 82 welds using laser surface melting. / Lee, Hwa-Teng; Liu, Te Chen.

In: Materials Transactions, Vol. 58, No. 9, 01.01.2017, p. 1329-1336.

Research output: Contribution to journalArticle

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