Warm Precracking at 295 K and Its Effects on the 4-K Toughness of Austenitic Steels

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Volume 19, Issue 4 (July 1991)

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ISSN: 0090-3973
Page Count: 9

Warm Precracking at 295 K and Its Effects on the 4-K Toughness of Austenitic Steels
Tobler, RL
National Institute of Standards and Technology,

Shimada, M
Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd.,

Abstract

Experiments show that some austenitic steels at extreme cryogenic temperatures are toughened by warm prestress. We demonstrate this for Fe-17Cr-3Ni-13Mn-0.33N steel specimens that were warm precracked at 295 K and then fractured in liquid helium at 4 K where failure occurs by slip-plane cracking. On the other hand, Fe-13Cr-5Ni-22Mn-0.21N steel with higher toughness and a ductile fracture mechanism at 4 K was not affected by similar warm precracking. Austenitic and ferritic steel behaviors are compared, and precracking procedures for 4-K fracture tests are discussed.

Keywords:
austenitic stainless steel, cryogenic properties of materials, fatigue, fracture toughness, test standards, warm prestress

Paper ID: JTE12575J
DOI: 10.1520/JTE12575J
ASTM International is a member of CrossRef.

Author Title Warm Precracking at 295 K and Its Effects on the 4-K Toughness of Austenitic Steels Symposium , 0000-00-00 Committee A01

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 19, Issue 4 (July 1991) Click here to download this paper now for $25 PDF (368K) View License Agreement ISSN: 0090-3973 Page Count: 9 Warm Precracking at 295 K and Its Effects on the 4-K Toughness of Austenitic Steels Tobler, RL National Institute of Standards and Technology, Shimada, M Superconducting and Cryogenic Technology Center, Kobe Steel, Ltd., Abstract Experiments show that some austenitic steels at extreme cryogenic temperatures are toughened by warm prestress. We demonstrate this for Fe-17Cr-3Ni-13Mn-0.33N steel specimens that were warm precracked at 295 K and then fractured in liquid helium at 4 K where failure occurs by slip-plane cracking. On the other hand, Fe-13Cr-5Ni-22Mn-0.21N steel with higher toughness and a ductile fracture mechanism at 4 K was not affected by similar warm precracking. Austenitic and ferritic steel behaviors are compared, and precracking procedures for 4-K fracture tests are discussed. Keywords: austenitic stainless steel, cryogenic properties of materials, fatigue, fracture toughness, test standards, warm prestress Paper ID: JTE12575J DOI: 10.1520/JTE12575J ASTM International is a member of CrossRef. Author Title Warm Precracking at 295 K and Its Effects on the 4-K Toughness of Austenitic Steels Symposium , 0000-00-00 Committee A01