TY - JOUR
T1 - An investigation on microstructure and pitting corrosion behavior of 316L stainless steel weld joint
AU - Zhu, Ping
AU - Cao, Xinyuan
AU - Wang, Wei
AU - Zhao, Jiancang
AU - Lu, Yonghao
AU - Shoji, Tetsuo
N1 - Publisher Copyright:
Copyright © Materials Research Society 2017 Â.
PY - 2017/10/27
Y1 - 2017/10/27
N2 - Microstructure and pitting corrosion behavior of base metal (BM), heat-Affected zone (HAZ), and weld zone (WZ) in the 316L stainless steel weld joint was investigated. The results indicated that WZ, including ferrite and austenite phases, was mainly composed of columnar dendrites, while BM and HAZ exhibited a full-Austenite structure with low Σ coincidence site lattice boundaries especially twin boundary primarily. No obvious pitting occurred in WZ, while the millimeter-scale pits were observed in HAZ and BM after immersion test in 6% FeCl3 solution. HAZ had a lower pitting potential than WZ and BM, while not much difference in pitting potential was observed between WZ and BM. Dendrite-selected corrosion occurred in WZ, while grain boundary was the preferable site for pitting corrosion in HAZ and BM. Gain refinement and a decrease in twin boundary volume fraction promoted the pitting corrosion susceptible of HAZ.
AB - Microstructure and pitting corrosion behavior of base metal (BM), heat-Affected zone (HAZ), and weld zone (WZ) in the 316L stainless steel weld joint was investigated. The results indicated that WZ, including ferrite and austenite phases, was mainly composed of columnar dendrites, while BM and HAZ exhibited a full-Austenite structure with low Σ coincidence site lattice boundaries especially twin boundary primarily. No obvious pitting occurred in WZ, while the millimeter-scale pits were observed in HAZ and BM after immersion test in 6% FeCl3 solution. HAZ had a lower pitting potential than WZ and BM, while not much difference in pitting potential was observed between WZ and BM. Dendrite-selected corrosion occurred in WZ, while grain boundary was the preferable site for pitting corrosion in HAZ and BM. Gain refinement and a decrease in twin boundary volume fraction promoted the pitting corrosion susceptible of HAZ.
KW - corrosion
KW - microstructure
KW - welding
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U2 - 10.1557/jmr.2017.316
DO - 10.1557/jmr.2017.316
M3 - Article
AN - SCOPUS:85046690726
SN - 0884-2914
VL - 32
SP - 3904
EP - 3911
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 20
ER -