Fatigue crack growth properties of a cryogenic structural steel at liquid helium temperature

Journal Article · Mon Jan 01 00:00:00 EST 1996 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2805922· OSTI ID:203576

Konosu, Shinji; Kishiro, Tomohiro; Ivano, O ^[1]; Nunoya, Yoshihiko; Nakajima, Hideo; Tsuji, Hiroshi ^[2]

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1. Ibaraki Univ., Hitachi, Ibaraki (Japan). Dept. of Mechanical Engineering
2. Japan Atomic Energy Research Inst., Ibaraki (Japan)

The structural materials of the coils of superconducting magnets utilized in thermonuclear fusion reactors are used at liquid helium (4.2 K) temperatures and are subjected to repeated thermal stresses and electromagnetic forces. A high strength, high toughness austenitic stainless steel (12Cr-12Ni-10Mn-5Mo-0.2N) has recently been developed for large, thick-walled components used in such environments. This material is non-magnetic even when subjected to processing and, because it is a forging material, it is advantageous as a structural material for large components. In the current research, a large forging of 12Cr-12Ni-10Mn-5Mo-0.2N austenitic stainless steel, was fabricated to a thickness of 250 mm, which is typical of section thicknesses encountered in actual equipment. The tensile fatigue crack growth properties of the forging were examined at liquid helium temperature as a function of specimen location across the thickness of the forging. There was virtually no evidence of variation in tensile strength or fatigue crack growth properties attributable to different sampling locations in the thickness direction and no effect of thickness due to the forging or solution treatment associated with large forgings was observed.

• Sponsoring Organization: USDOE
• OSTI ID: 203576
• Journal Information: Journal of Engineering Materials and Technology, Vol. 118, Issue 1; Other Information: PBD: Jan 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION
IRON BASE ALLOYS
FATIGUE
TENSILE PROPERTIES
CHROMIUM ALLOYS
NICKEL ALLOYS
MANGANESE ALLOYS
MOLYBDENUM ALLOYS
THERMONUCLEAR REACTORS
SUPERCONDUCTING MAGNETS
NITROGEN ADDITIONS
CRACK PROPAGATION
CHEMICAL COMPOSITION
SAMPLE PREPARATION
FRACTURE MECHANICS
SCANNING ELECTRON MICROSCOPY
STRESSES
EXPERIMENTAL DATA