Alloy82銲道微結構與沿晶腐蝕阻抗之研究

Translated title of the contribution: Microstructure and Intergranular Corrosion Resistance Evaluation of Alloy 82 Weldments

Hwa-Teng Lee, Te Chen Liu

Research output: Contribution to journalArticle

Abstract

An investigation is performed into the grain boundary character distribution (GBCD), degree of sensitization (DOS), and intergranular corrosion (IGC) resistance of Alloy 82 overlay welds prepared using a manual gas tungsten arc welding (GTAW) process. Four different weldments are considered, namely as-welded (AW), sensitized (AW+SEN), solution-annealed (SS), and solution-annealed and then sensitized (SS+SEN). The results show that approximately 67.9% and 212.4 cm/cm2 of the grain boundaries in the weldments were prepared by GTAW process found AW specimens are high-angle boundaries (>15°). These boundaries prompt the precipitation of fine Cr-carbides during sensitization treatment, and therefore cause the formation of Cr-depletion zones close to the grain boundary. Consequently, the AW+SEN weldment has a high DOS. By contrast, AW+SEN welds are processed using a laser surface melting (LSM) technique with a continuous CO 2 laser beam and scanning speeds in the range of 0.8~1.2 m/min. It is shown that the LSM treatment could improve IGC and pitting corrosion resistance of the overlay weld mainly by reducing the amounts of fine precipitates along the subgrain boundaries of sensitized weld.

Original languageChinese
Pages (from-to)131-143
Number of pages13
JournalJournal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
Volume39
Issue number2
Publication statusPublished - 2018 Apr 1

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Corrosion resistance
Welds
Microstructure
Grain boundaries
Electric arc welding
Tungsten
Melting
Lasers
Pitting
Gases
Laser beams
Carbides
Precipitates
Corrosion
Scanning

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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abstract = "An investigation is performed into the grain boundary character distribution (GBCD), degree of sensitization (DOS), and intergranular corrosion (IGC) resistance of Alloy 82 overlay welds prepared using a manual gas tungsten arc welding (GTAW) process. Four different weldments are considered, namely as-welded (AW), sensitized (AW+SEN), solution-annealed (SS), and solution-annealed and then sensitized (SS+SEN). The results show that approximately 67.9{\%} and 212.4 cm/cm2 of the grain boundaries in the weldments were prepared by GTAW process found AW specimens are high-angle boundaries (>15°). These boundaries prompt the precipitation of fine Cr-carbides during sensitization treatment, and therefore cause the formation of Cr-depletion zones close to the grain boundary. Consequently, the AW+SEN weldment has a high DOS. By contrast, AW+SEN welds are processed using a laser surface melting (LSM) technique with a continuous CO 2 laser beam and scanning speeds in the range of 0.8~1.2 m/min. It is shown that the LSM treatment could improve IGC and pitting corrosion resistance of the overlay weld mainly by reducing the amounts of fine precipitates along the subgrain boundaries of sensitized weld.",
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