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

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

doi:10.3989/revmetalm.2003.v39.i5.350

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

Authors

M. L. Saucedo-Muñoz Universidad de Tohoku. Instituto de Investigaciones en Fractura; Instituto Politécnico Nacional (México)
S. I. Komazaki Instituto de Tecnología de Mororan
T. Hashida Universidad de Tohoku. Instituto de Investigaciones en Fractura
T. Shoji Universidad de Tohoku. Instituto de Investigaciones en Fractura
V. M. López-Hirata Instituto Politécnico Nacional

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.i5.350

Keywords:

Small-punch test, Fracture toughness, Austenitic stainless steels

Abstract

Two types of austenitic stainless steels JJl and JNl 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 JNl steel due to its higher content of C and N, compared to that of JJl steel.

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Published

2003-10-30

How to Cite

Saucedo-Muñoz, M. L., Komazaki, S. I., Hashida, T., Shoji, T., & López-Hirata, V. M. (2003). Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels. Revista De Metalurgia, 39(5), 378–386. https://doi.org/10.3989/revmetalm.2003.v39.i5.350

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Issue

Vol. 39 No. 5 (2003)

Section

Technical Notes

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