TY - JOUR
T1 - Hot corrosion behavior of three different zones of linear friction welded Ti-22Al-25Nb alloy
AU - Chen, Xi
AU - Xie, Faqin
AU - Ma, Tiejun
AU - Li, Wenya
AU - Wu, Xiangqing
N1 - Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/4
Y1 - 2019/4
N2 - Ti-22Al-25Nb joint was achieved by using linear friction welding (LFW) technique. The hot corrosion behavior of base metal, weld zone, and thermo-mechanically affected zone (TMAZ) was investigated at 700 °C in 25% NaCl-75% Na 2 SO 4 (wt%) mixed molten salt. In the initial stage, the base metal and joint exhibit similar oxidation resistant ability, and the corrosion products formed on all zones are mainly composed of TiO 2 , Nb 2 O 5 , and Al 2 O 3 . The formation of NaNbO 3 first occurs in base metal and TMAZ after 50 h, while the weld zone is free of NaNbO 3 until 100 h. The development of pitting corrosion in both base metal and TMAZ is caused by the diffusion of sulfur and re-oxidation of sulfides. After a prolong exposure in molten salts, more serious sulfuration, acid dissolution, and escape of gaseous chlorides occurred in base metal leading to a drastic acceleration of corrosion rate.
AB - Ti-22Al-25Nb joint was achieved by using linear friction welding (LFW) technique. The hot corrosion behavior of base metal, weld zone, and thermo-mechanically affected zone (TMAZ) was investigated at 700 °C in 25% NaCl-75% Na 2 SO 4 (wt%) mixed molten salt. In the initial stage, the base metal and joint exhibit similar oxidation resistant ability, and the corrosion products formed on all zones are mainly composed of TiO 2 , Nb 2 O 5 , and Al 2 O 3 . The formation of NaNbO 3 first occurs in base metal and TMAZ after 50 h, while the weld zone is free of NaNbO 3 until 100 h. The development of pitting corrosion in both base metal and TMAZ is caused by the diffusion of sulfur and re-oxidation of sulfides. After a prolong exposure in molten salts, more serious sulfuration, acid dissolution, and escape of gaseous chlorides occurred in base metal leading to a drastic acceleration of corrosion rate.
KW - hot corrosion behavior
KW - linear friction welding
KW - pitting corrosion
KW - sulfuration
KW - Ti-22Al-25Nb alloy
UR - http://www.scopus.com/inward/record.url?scp=85057853761&partnerID=8YFLogxK
U2 - 10.1002/maco.201810356
DO - 10.1002/maco.201810356
M3 - 文章
AN - SCOPUS:85057853761
SN - 0947-5117
VL - 70
SP - 612
EP - 622
JO - Materials and Corrosion
JF - Materials and Corrosion
IS - 4
ER -