Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests

Shi Cheng Liu; Shin Ichi Komazaki; Il Hyun Kwon; Toshiyuki Hashida; Hideaki Takahashi; Hideo Nakajima

doi:10.1299/kikaia.70.628

Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests

Shi Cheng Liu, Shin Ichi Komazaki, Il Hyun Kwon, Toshiyuki Hashida, Hideaki Takahashi, Hideo Nakajima

ENG - Fracture and Reliability Research Institute

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The small punch (SP) tests were conducted at 77 K and 4 K using austenitic stainless steels JN 1, JJ 1 and JK 2, which have been recently developed for use as a cryogenic structural material. The tests were applied to the steels aged at 923-1 073 K to investigate changes in their toughness at cryogenic temperature due to thermal aging. The area under the load-deflection curve up to the macro-crack initiation was defined as SP energy to evaluate the fracture toughness of the steels. The experimental results showed that the SP energy of JN 1 decreased monotonously with an increase in aging temperature. On the other hand, the SP energy of JK 2 showed no significant change even after the thermal aging at 923 K and 973 K and decreased after the thermal aging at 1 023 K. Metallogra-phic examination revealed that this difference in decrease of SP energy due to thermal aging was caused by the variation in amount and distribution of grain boundary M₂₃C₆ carbides. As a consequence, JN 1 was more susceptible to thermal aging embrittlement than the other steels, and high resistance of JK 2 to embrittlement was attributable to the depression of precipitation and coarsening of grain boundary precipitates.

Original language	English
Pages (from-to)	628-635
Number of pages	8
Journal	Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume	70
Issue number	692
DOIs	https://doi.org/10.1299/kikaia.70.628
Publication status	Published - 2004

Keywords

Austenitic Stain-less Steel
Brittle Fracture
Cryogenic Small Punch Test
Cryogenic Structural Material
Fracture Toughness
Grain Boundary Precipitates
Structural Reliability
Thermal Aging Embrittlement

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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Liu, S. C., Komazaki, S. I., Kwon, I. H., Hashida, T., Takahashi, H., & Nakajima, H. (2004). Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests. Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, 70(692), 628-635. https://doi.org/10.1299/kikaia.70.628

Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests. / Liu, Shi Cheng; Komazaki, Shin Ichi; Kwon, Il Hyun; Hashida, Toshiyuki; Takahashi, Hideaki; Nakajima, Hideo.

In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 70, No. 692, 2004, p. 628-635.

Research output: Contribution to journal › Article › peer-review

Liu, SC, Komazaki, SI, Kwon, IH, Hashida, T, Takahashi, H & Nakajima, H 2004, 'Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests', Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, vol. 70, no. 692, pp. 628-635. https://doi.org/10.1299/kikaia.70.628

Liu, Shi Cheng ; Komazaki, Shin Ichi ; Kwon, Il Hyun ; Hashida, Toshiyuki ; Takahashi, Hideaki ; Nakajima, Hideo. / Evaluation of Thermal Aging Embrittlement of Austenitic Stainless Steels JN 1, JJ 1 and JK 2 by Cryogenic Small Punch Tests. In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A. 2004 ; Vol. 70, No. 692. pp. 628-635.

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abstract = "The small punch (SP) tests were conducted at 77 K and 4 K using austenitic stainless steels JN 1, JJ 1 and JK 2, which have been recently developed for use as a cryogenic structural material. The tests were applied to the steels aged at 923-1 073 K to investigate changes in their toughness at cryogenic temperature due to thermal aging. The area under the load-deflection curve up to the macro-crack initiation was defined as SP energy to evaluate the fracture toughness of the steels. The experimental results showed that the SP energy of JN 1 decreased monotonously with an increase in aging temperature. On the other hand, the SP energy of JK 2 showed no significant change even after the thermal aging at 923 K and 973 K and decreased after the thermal aging at 1 023 K. Metallogra-phic examination revealed that this difference in decrease of SP energy due to thermal aging was caused by the variation in amount and distribution of grain boundary M23C6 carbides. As a consequence, JN 1 was more susceptible to thermal aging embrittlement than the other steels, and high resistance of JK 2 to embrittlement was attributable to the depression of precipitation and coarsening of grain boundary precipitates.",

keywords = "Austenitic Stain-less Steel, Brittle Fracture, Cryogenic Small Punch Test, Cryogenic Structural Material, Fracture Toughness, Grain Boundary Precipitates, Structural Reliability, Thermal Aging Embrittlement",

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AU - Nakajima, Hideo

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AB - The small punch (SP) tests were conducted at 77 K and 4 K using austenitic stainless steels JN 1, JJ 1 and JK 2, which have been recently developed for use as a cryogenic structural material. The tests were applied to the steels aged at 923-1 073 K to investigate changes in their toughness at cryogenic temperature due to thermal aging. The area under the load-deflection curve up to the macro-crack initiation was defined as SP energy to evaluate the fracture toughness of the steels. The experimental results showed that the SP energy of JN 1 decreased monotonously with an increase in aging temperature. On the other hand, the SP energy of JK 2 showed no significant change even after the thermal aging at 923 K and 973 K and decreased after the thermal aging at 1 023 K. Metallogra-phic examination revealed that this difference in decrease of SP energy due to thermal aging was caused by the variation in amount and distribution of grain boundary M23C6 carbides. As a consequence, JN 1 was more susceptible to thermal aging embrittlement than the other steels, and high resistance of JK 2 to embrittlement was attributable to the depression of precipitation and coarsening of grain boundary precipitates.

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