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An investigation on microstructure and pitting corrosion behavior of 316L stainless steel weld joint

Published online by Cambridge University Press:  11 September 2017

Ping Zhu ,
Xinyuan Cao ,
Wei Wang ,
Jiancang Zhao ,
Yonghao Lu  and
Tetsuo Shoji
Ping Zhu
Affiliation:
Remanufacturing and Electric Power Safety Center, Suzhou Nuclear Power Research Institute Co. Ltd., Suzhou 215004, China
Xinyuan Cao
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Wei Wang
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Jiancang Zhao*
Affiliation:
Remanufacturing and Electric Power Safety Center, Suzhou Nuclear Power Research Institute Co. Ltd., Suzhou 215004, China
Yonghao Lu
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Tetsuo Shoji
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China; and Fracture and Reliability Research Institute, Tohoku University, Sendai 980-8579, Japan
*
a) Address all correspondence to this author. e-mail: zhaojiancang@cgnpc.com.cn
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Abstract

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.

Keywords

weldingmicrostructurecorrosion

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Type
Articles
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Journal of Materials Research , Volume 32 , Issue 20 , 27 October 2017 , pp. 3904 - 3911
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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