Effect of microstructure evolution on fracture toughness in isothermally aged austenitic stainless steels for cryogenic applications

Maribel L. Saucedo-Muñoz, Yutaka Watanabe, Tetsuo Shoji, Hideaki Takahashi

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)

Abstract

Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 600°C to 900°C for 10-1000 min in order to study the micro structural evolution and its effect on fracture toughness at cryogenic temperatures. These steels were developed for applications in the superconducting magnets of a fusion experimental reactor by the Japan Atomic Energy Research Institute. The Charpy V-Notch (CVN) fracture energy at 77 K showed a significant decrease with aging time for both steels. The intergranular precipitation of carbides and nitrides is responsible for the fracture toughness deterioration. The scanning electron microscope (SEM) 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. The volume fraction of precipitates can be uniquely correlated with the reduction in toughness. © 2001 Elsevier Science Ltd. All rights reserved.
Original languageAmerican English
Pages (from-to)693-700
Number of pages622
JournalCryogenics
DOIs
StatePublished - 1 Jan 2000
Externally publishedYes

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fracture toughness
austenitic stainless steels
Steel
Austenitic stainless steel
fracture strength
Cryogenics
cryogenics
Fracture toughness
microstructure
steel
steels
Microstructure
Aging of materials
Experimental reactors
Fracture energy
Superconducting magnets
Microstructural evolution
Brittle fracture
superconducting magnets
cryogenic temperature

Cite this

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title = "Effect of microstructure evolution on fracture toughness in isothermally aged austenitic stainless steels for cryogenic applications",
abstract = "Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 600°C to 900°C for 10-1000 min in order to study the micro structural evolution and its effect on fracture toughness at cryogenic temperatures. These steels were developed for applications in the superconducting magnets of a fusion experimental reactor by the Japan Atomic Energy Research Institute. The Charpy V-Notch (CVN) fracture energy at 77 K showed a significant decrease with aging time for both steels. The intergranular precipitation of carbides and nitrides is responsible for the fracture toughness deterioration. The scanning electron microscope (SEM) 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. The volume fraction of precipitates can be uniquely correlated with the reduction in toughness. {\circledC} 2001 Elsevier Science Ltd. All rights reserved.",
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Effect of microstructure evolution on fracture toughness in isothermally aged austenitic stainless steels for cryogenic applications. / Saucedo-Muñoz, Maribel L.; Watanabe, Yutaka; Shoji, Tetsuo; Takahashi, Hideaki.

In: Cryogenics, 01.01.2000, p. 693-700.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Saucedo-Muñoz, Maribel L.

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AU - Takahashi, Hideaki

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N2 - Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 600°C to 900°C for 10-1000 min in order to study the micro structural evolution and its effect on fracture toughness at cryogenic temperatures. These steels were developed for applications in the superconducting magnets of a fusion experimental reactor by the Japan Atomic Energy Research Institute. The Charpy V-Notch (CVN) fracture energy at 77 K showed a significant decrease with aging time for both steels. The intergranular precipitation of carbides and nitrides is responsible for the fracture toughness deterioration. The scanning electron microscope (SEM) 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. The volume fraction of precipitates can be uniquely correlated with the reduction in toughness. © 2001 Elsevier Science Ltd. All rights reserved.

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