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

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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.
Original languageAmerican English
Pages (from-to)378-386
Number of pages339
JournalRevista de Metalurgia (Madrid)
StatePublished - 1 Sep 2003
Externally publishedYes

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punches
austenitic stainless steels
Steel
toughness
Austenitic stainless steel
fracture strength
Cryogenics
Toughness
fracture toughness
cryogenics
Fracture toughness
Fracture energy
Aging of materials
steel
steels
evaluation
Microstructural evolution
Brittle fracture
cryogenic temperature
notches

Cite this

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title = "Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels",
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.",
author = "Saucedo-Mu{\~n}oz, {M. L.} and Komazaki, {S. I.} and T. Hashida and T. Shoji and L{\'o}pez-Hirata, {V. M.}",
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T1 - Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels

AU - Saucedo-Muñoz, M. L.

AU - Komazaki, S. I.

AU - Hashida, T.

AU - Shoji, T.

AU - López-Hirata, V. M.

PY - 2003/9/1

Y1 - 2003/9/1

N2 - 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.

AB - 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.

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