Study of Cryogenic Storage Tank Fatigue Life. Low Temperature Mechanical Testing of AISI 304 and 310 Stainless Steels.
NATIONAL BUREAU OF STANDARDS BOULDER CO CRYOGENICS DIV
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Two 300 series stainless steels were tested for impact-fatigue life and tensile properties as a function of temperature, percent transformed phase martensite, stress level, and specimen geometry. These alloys were studied to predict the fracture characteristics of parent material and weld joints in large cryogenic dewars which are subjected to periodic stresses. Normally, AISI 304 is employed in the construction of such dewars. Under fatigue loading conditions at cryogenic temperatures, the behavior of AISI 304 is complicated by the gradual transformation to a martensitic structure. The influence of this transformation on the fracture characteristics was studied. For this purpose, a new impact- fatigue test and necessary equipment were developed. The fatigue strength of AISI 304 and 310 exhibit similar trends, but at a given fatigue life and temperature, the fatigue strength of AISI 304 is slightly superior. AISI 310 displays an endurance limit of about 20,000 psi, the 304 limit is 25-30,000 psi. However, the lowest endurance limit weakest specimens appear to be the trixially-loaded AISI 304 weld specimens which have an endurance limit near 10, 000 psi. Little temperature-dependence of the impact-fatigue properties was observed. Author
- Metallurgy and Metallography
- Containers and Packaging