Aplicación del ensayo miniatura de embutido para la evaluación de la tenacidad a temperaturas criogénicas de aceros inoxidables austeníticos envejecidos isotérmicamente

Translated title of the contribution: Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels

M. L. Saucedo-Muñoz, S. I. Komazaki, T. Hashida, T. Shoji, V. M. López-Hirata

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 873 to 1173 K for 10 to 1000 min in order to study the microstructural evolution and its effect on fracture toughness at cryogenic temperatures. The Charpy V-Notch (CVN) and Small-Punch (SP) Testing methods were conducted at 77 K to evaluate the toughness of both solution treated and aged specimens. The fracture energy at 77 K determined for both methods showed a significant decrease with aging time for both steels. A linear correlation between the fracture energies of both methods was found. The intergranular precipitation of carbides and nitrides was responsible for the fracture toughness deterioration. The scanning electron microscope fractographs showed an intergranular brittle fracture and its fraction also increased with aging time and temperature. The presence of a more abundant intergranular precipitation resulted in a more rapid decrease in fracture toughness with aging time in JN1 steel due to its higher content of C and N, compared to that of JJ1 steel.

Translated title of the contributionApplication of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels
Original languageSpanish
Pages (from-to)378-386
Number of pages9
JournalRevista de Metalurgia (Madrid)
Volume39
Issue number5
DOIs
Publication statusPublished - 2003

Keywords

  • Austenitic stainless steels
  • Fracture toughness
  • Small-punch test

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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