Rejuvenation of weld decayed alloy 82 by laser surface treatment

K. Y. Chen, H. T. Lee, S. L. Jeng, C. C. Hsu, B. C. Tseng

研究成果: Article同行評審

摘要

Laser surface treatments were studied for their feasibility in repairing the decayed Alloy 82 weldment where the weld decayed zone is rejuvenated and corrosion resistance is recovered. Modified Huey test was employed to reveal the width of rejuvenated area, and double loop-EPR test was employed to evaluate the corrosion resistance of each specimen. The experimental results showed that interdendritic pitting resistance of laser treated specimens was remarkably improved both in melted zone and heat affected zone where Nb-rich phases were resolved. However, TiC/NbC or (Nb,Ti)C particles remained unresolved in the heat affected zone. As a consequence, heat affected zone had a superior mechanical strength than melted zone. The DL-EPR results revealed that laser treated areas with lower reactivation current and degree of sensitization values (DOS, Ir/Ia) indicated higher corrosion resistance. Hence, laser surface treatment is proven to be a practical technique for repairing the decayed Alloy 82 weldment.

原文English
頁(從 - 到)89-98
頁數10
期刊Journal of Chinese Corrosion Engineering
26
發行號2
出版狀態Published - 2012

All Science Journal Classification (ASJC) codes

  • 一般化學工程
  • 表面、塗料和薄膜
  • 材料化學

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