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Distribution and Characteristics of Oxide Films Formed on Stainless Steel Cladding on Low Alloy Steel in Simulated PWR Primary Water Environments

  • Qi Xiong
  • Hongjuan Li
  • Zhanpeng LuEmail author
  • Junjie Chen
  • Qian Xiao
  • Jiarong Ma
  • Xiangkun Ru
  • Xue Liang
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The properties of oxide film formed on stainless steel (SS) cladding on low alloy steel (LAS) after immersion in simulated PWR primary water environments with different dissolved oxygen contents are investigated. The HAZ in the LAS consist of overheated crystal region, complete recrystallized region and incompletely recrystallized region, while SS cladding consist of austenite zone and austenite and ferrite mixing zone. Pitting appeared on 309L SS after immersion in high temperature water due to the dissolution of inclusions existed previously on 309L SS which contain higher ferrite content. Raman spectra and TEM results show that the outer layer is mainly Fe-rich spinel oxides while the inner layer is mainly Cr-rich oxides. Ni is mainly concentrate at the oxide/substrate interface due to the low oxygen affinity. The inner oxide layer on 308L SS is thinner than that on 309L SS, implying that ferrite distributed on austenite is not favorable for the growth of oxides. Reducing the oxygen content in PWR primary water favored the formation of spinel oxides.

Keywords

Stainless steel cladding Pressurized water reactor Low alloy steel Oxide film High temperature water 

Notes

Acknowledgements

This work was supported by Shanghai Municipal Commission of Economy and Informatization No. T-221715003, National Natural Science Foundation of China (51571138), and the International Cooperative Project sponsored by Science and Technology Commission of Shanghai Municipality No. 13520721200.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Qi Xiong
    • 1
    • 2
  • Hongjuan Li
    • 1
    • 2
  • Zhanpeng Lu
    • 1
    • 2
    • 3
    Email author
  • Junjie Chen
    • 1
    • 2
  • Qian Xiao
    • 1
    • 2
  • Jiarong Ma
    • 1
    • 2
  • Xiangkun Ru
    • 1
    • 2
  • Xue Liang
    • 3
  1. 1.Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghaiChina
  2. 2.State Key Laboratory of Advanced Special SteelsShanghai UniversityShanghaiChina
  3. 3.Key Laboratory for MicrostructureShanghai UniversityShanghaiChina

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