ROTATING-BEAM FATIGUE STUDIES OF EXPERIMENTAL HY-130/150 AND HY-180/210 STEELS,
Abstract
Because submarines are repeatedly pressurized during service, the high-stress, low-cycle fa tigue strength of pressure-hull materials is an important property. Therefore, a study was initiated to obtain a preliminary assessment of the fatigue strength of four experimental HY-130/150 steels, including the promising 5Ni-Cr-Mo-V steel and of one experimental HY-180/210 steel, for comparison with the fatigue strength of HY-80 steel. The results of rotating-beam fatigue tests conducted at 0.8 tensile strength on smooth specimens in air showed that the fatigue and tensile strengths of the 5Ni-Cr-Mo-V steel were 40 to 45 percent greater than those of the HY-80 steel. Similar tests on smooth specimens in synthetic sea water and on notched specimens in air and in synthetic sea water indicated that all three conditions lowered the fatigue strength of all steels tested, and that the notched specimen tested in synthetic sea water showed the greatest loss in fatigue strength. Although the 5Ni-Cr-MoV experimental HY-130/150 steel showed a slightly greater sensitivity to notches and a sea-water environment than the HY-80 steel, the differences were not satistically significant for fatigue tests. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1964
- Accession Number
- AD0456331
Entities
People
- A. W. Loginow
- R. P. Haak
- S. T. Rolfe
Organizations
- U.S. Steel