The Effect of Sigma Phase Formation on the Corrosion and Mechanical Properties of Nb-Stabilized Stainless Steel Cladding

K. Klemetti*, Hannu Hänninen, J. Kivilahti

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

Austenitic stainless steel surfacing is commonly used to protect ferritic pressure vessels from the corrosive environment in nuclear reactors and chemical process plants. The delta ferrite in a Nb-stabilized austenitic cladding decomposes during stress relief heat treatments (10 to 600 h at 670 degree C, or 1238 degree F), forming sigma phase and secondary austenite. Increases in sigma phase content enhance hydrogen embrittlement and reduce impact toughness. Slow strain-rate tests did not cause stress corrosion cracking in hot 0. 58N H//3BO//3 solution. In 1N HCl solution the cracks grew as the delta ferrite and sigma phases were selectively dissolved.

Original languageEnglish
Pages (from-to)17-25
Number of pages9
JournalWelding Journal
Volume63
Issue number1
Publication statusPublished - Jan 1984
MoE publication typeA1 Journal article-refereed

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