Newly Developed Electrochemical Evaluation Method of Temper Embrittlement of Cr-Mo-V Steel and 2.25 Cr-1 Mo Steel

Yutaka Watanabe, Tetsuo Shoji

Research output: Contribution to journalArticle

Abstract

A nondestructive electrochemical method is developed for detection and evaluation of temper embrittlement of Cr-Mo-V Steel and 2.25 Cr-1 Mo steel. In this method, temper embrittlement can be detected and evaluated by the second peak of current density “IP2”: which appears in the anodic polarization curves measured in a calcium nitrate solution. In contrast to nonembrittled materials (couplings and de-embrittling heat-treated materials) which exhibited the dull and low second peak, the sharp and high second peak current appeared in the anodic polarization curves measured on embrittled materials. This increase in IP2 is caused by selective dissolution of embrittled (impurity-enriched) grain boundaries and that increase in IP2 has a good correlation with the shifts in FATT. Temper embrittlement can be nondestructively evaluated by IP2 measurements with high accuracy.

Original languageEnglish
Pages (from-to)1233-1239
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Volume57
Issue number537
DOIs
Publication statusPublished - 1991 Jan 1

Keywords

  • 2.25 Cr-1 Mo Steel
  • Cr-Mo-V Steel
  • Electrochemistry
  • Heat-Resistant Material
  • Iron and Steel
  • Nondestructive Inspection
  • Temper Embrittlement

ASJC Scopus subject areas

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

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