Cryogenic Fatigue Properties of 304L and 316L Stainless Steels Compared to Mechanical Strength and Increasing Magnetic Permeability
Криогенные усталостные свойства нержавеющих сталей 304L и 316L в сравнении с механической прочностью и ростом магнитной проницаемости
1988-03-01
SCID: 54.1/9j2nnbd2
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304L stainless steel316L stainless steelcryogenic fatiguemagnetic permeabilitystrain-induced martensitic transformation
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Abstract (AI)
Abstract For superconducting magnet applications, the 4 K fatigue life curves of the cryogenic structural materials 304L and 316L stainless steel were obtained using axial-strain control conditions. These curves were compared with others at 77 and 300 K and with data for other 300-series stainless steels in the literature. Increasing magnetic permeability with monotonic tensile and cyclic straining, due to strain-induced martensitic transformation, was also investigated, since 304L and 316L are metastable austenitic stainless steels. 4 K fatigue life curves relating magnetic permeability effects were obtained. Fatigue tests relating magnetic permeability at 77 and 300 K were also conducted for comparison. Finally, a cryogenic fatigue design criterion for preventing mechanical failure and increasing magnetic permeability was considered.
Key Findings
1
A cryogenic fatigue design criterion was proposed to prevent mechanical failure and limit increases in magnetic permeability for these metastable austenitic steels.
2
Axial-strain controlled fatigue life curves at 4 K were obtained for 304L and 316L stainless steels relevant to superconducting magnet applications.
3
Fatigue life curves at 4 K were correlated with changes in magnetic permeability, with additional permeability-related fatigue tests performed at 77 K and 300 K for comparison.
4
Monotonic tensile and cyclic straining increase magnetic permeability in 304L and 316L due to strain-induced martensitic transformation.
5
The 4 K fatigue life curves for 304L and 316L were compared to corresponding curves at 77 K and 300 K and to other 300-series stainless steel data from literature.
Research Object
Cryogenic structural 304L and 316L austenitic stainless steels used in superconducting magnet applications
Research Subject
Fatigue properties at 4 K (and comparison at 77 K and 300 K) including fatigue life curves under axial-strain control, relationship to mechanical strength, and the effect of strain-induced martensitic transformation on increasing magnetic permeability; and formulation of a cryogenic fatigue design criterion to prevent mechanical failure and magnetic-permeability increase
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1988-03-01
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