4. 2 K fracture toughness of 304 stainless steel in a magnetic field
Metastable austenitic steels are used in the structure of high field of superconducting magnets. In this application the alloys sustain high stresses in high magnetic fields at 4.2 K. Safe and effective design demands complete characterization of tensile, fatigue, and fracture toughness behavior of these alloys under the anticipated operating conditions. The characterization problem is complex because these metastable austenitic steels can undergo strain-induced martensitic transformation at cryogenic temperatures. The available data on the behavior of metastable austenitic steels in magnetic fields at 4.2 K is somewhat confusing. It is known that the presence of a high magnetic field during deformation can enhance martensitic transformation in Ni, Ni-Cr, and Mn steels. The tensile behavior and the fatigue behavior of 304L and 304LN, which are, respectively, less stable and more stable than 304, have also been investigated in some detail in higher strength fields. Yield strength and fatigue property changes between tests performed in a magnetic field and without a magnetic field were not significant while the ultimate strength increased only slightly. The present work was undertaken to determine the extent and nature of the fracture toughness change of 304 stainless steel at 4.2 K in an 8 T magnetic field.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5424568
- Report Number(s):
- LBL-27378; CONF-890701-14; ON: DE90002083
- Resource Relation:
- Conference: International cryogenic materials conference, Los Angeles, CA (USA), 24-28 Jul 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUSTENITIC STEELS
MECHANICAL PROPERTIES
STAINLESS STEEL-304
CRACK PROPAGATION
DEFORMATION
FRACTURES
MAGNETIC FIELDS
STRAIN HARDENING
ULTRALOW TEMPERATURE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
FAILURES
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
STAINLESS STEELS
STEEL-CR19NI10
STEELS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies