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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Corrosion Failure of Stainless Steel Thermowells

By
D.K. Bhattacharya
D.K. Bhattacharya
Metallurgy and Materials Programme, Indira Gandhi Centre for Atomic Research
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;
Baldev Raj
Baldev Raj
Metallurgy and Materials Programme, Indira Gandhi Centre for Atomic Research
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;
E.C. Lopez
E.C. Lopez
Zenford Ziegler Pvt. Ltd.
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;
V. Seetharaman
V. Seetharaman
Universal Energy Systems, Inc.
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Published:
1993
Page range:
160 - 162

Abstract

Pressure testing of a batch of AISI type 316L stainless steel thermowells intended for use in a nuclear power-plant resulted in the identification of leakage at the tips in 20% of the parts. Radiography at the tip region of representative thermowells showed linear indications along the axes. SEM examination revealed the presence of longitudinally oriented nonmetallic inclusions that were partly retained and partly dislodged. Electron-dispersive x-ray analysis indicated that the inclusions were composed of CaO. Based on the overall chemistry of the inclusion sites, the source of the CaO was determined to be slag entrapment during the steel making process. It was recommended that the thermowell blanks be ultrasonically tested prior to machining and that the design be modified to make internal pressurization possible.

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D.K. Bhattacharya, Baldev Raj, E.C. Lopez, V. Seetharaman, 1993. "Corrosion Failure of Stainless Steel Thermowells", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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