Journal
CORROSION SCIENCE
Volume 65, Issue -, Pages 472-480Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.08.054
Keywords
Stainless steel; TEM; Welding; Pitting corrosion
Funding
- National Science Foundation of China [50871031, 51131008, 51134010, 51071049]
- Industrialization Project of Shanghai New and High technology
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The effect of laser-beam welding and subsequent short-time post-weld heat treatment at different temperatures and holding time on microstructure evolution and pitting corrosion behavior of UNS 531803 duplex stainless steel was investigated. The results showed the as-welded joint displayed impaired pitting corrosion resistance and that pitting preferentially occurred at ferrite grain in the fusion zone. Short-time heat treatment enhanced the pitting corrosion resistance of welded joint. Optimal post-weld heat treatment of 3 min heat treatment at 1080 degrees C was identified at which the joint restored the pitting corrosion resistance lost during welding process. (C) 2012 Elsevier Ltd. All rights reserved.
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