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Microstructure and electrochemical behavior of stainless steel weld overlay cladding exposed to post weld heat treatment

Published online by Cambridge University Press:  30 January 2017

X.Y. Cao ,
P. Zhu ,
T.G. Liu ,
Y.H. Lu  and
T. Shoji
X.Y. Cao
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
P. Zhu
Affiliation:
Remanufacturing and Electric Power Safety Center, Suzhou Nuclear Power Research Institute Co. Ltd., Suzhou 215004, China
T.G. Liu
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Y.H. Lu*
Affiliation:
National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
T. 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: lu_yonghao@mater.ustb.edu.cn
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Abstract

Microstructure and electrochemical behavior of stainless steel weld overlay cladding exposed to post weld heat treatment (PWHT) were investigated, wherein pitting and intergranular corrosion behaviors of the cladding material were evaluated by potentiodynamic polarization and double loop electrochemical potentiokinetic reactivation methods. The results indicated that inclusions, multiple element (Mn, Si, and Al) oxides distributed randomly in the cladding material with a size less than 1 μm. PWHT contributed to carbides precipitation along the δ/γ phase interface and the formation of Cr-depleted zone in the austenite phase. Inclusions acted as the pitting sites in the sample as welded. PWHT reduced the pitting potential and contributed to the formation of larger and deeper pits, which nucleated around the δ/γ phase interface primarily. Existence of carbides and Cr-depleted zone dominated the loss of intergranular corrosion resistance after PWHT.

Keywords

weldingmicrostructurecorrosion
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 4 , 28 February 2017 , pp. 852 - 862
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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