Nondestructive evaluation of hydrogen absorption embrittlement of tantalum and life management in chemical plant

Masao Nakahara, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Tantalum (Ta) has excellent corrosion resistance, but is rather expensive. Therefore, Ta has been used for critical components in chemical plants operating in highly corrosive environments. However, one typical degradation phenomenon of Ta is hydrogen absorption embrittlement. The object of this paper is to present the case study of a failure analysis on a Ta sheath tube of a thermometer used in a sulfuric-acid-containing environment. In the analysis, the nondestructive evaluation (NDE) method for estimation of hydrogen concentration and the changes in mechanical properties of Ta with hydrogen absorption was examined. Furthermore, with the aim of life extension of the components of interest, a hydrogen desorption procedure to recover the mechanical properties of the samples was also examined. Based on NDE of hydrogen concentration of Ta and hydrogen desorption heat treatment on service-exposed materials, life estimation and management procedures of components in chemical plants are proposed.

Original languageEnglish
Pages (from-to)707-712
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume62
Issue number595
DOIs
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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