Fatigue Crack Propagation in an HSLA Steel (MF-80) in Air and in Salt Water

Fatigue crack propagation was studied in MF-80 HSLA steel in ambient room air and in 3.5 percent NaC1 salt water. Region-II fatigue crack growth rate (da/dN) data were obtained at two load ratios, R=0.10 and R = 0.67. da/dN values were found to be affected by both load ratio and environment, with th...

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Bibliographic Details
Main Authors: Gill,S J, Crooker,T W
Format: Report
Language:English
Subjects:
AIR
CORROSION
CRACK PROPAGATION
FATIGUE(MECHANICS)
HIGH STRENGTH
HS-100 steel
HSLA steel
HSLA(High Strength Low Alloy) Steel
HY- 100 steel
LOADS(FORCES)
LOW ALLOY STEELS
Marine Engineering
MATHEMATICAL MODELS
Mechanics
MICROSTRUCTURE
NAVAL VESSELS
NUMERICAL ANALYSIS
PE62343N
Properties of Metals and Alloys
RATIOS
SALT WATER
STEEL
STRENGTH(MECHANICS)
STRUCTURAL STEEL
TABLES(DATA)
TEST AND EVALUATION
Test Facilities, Equipment and Methods
WU1086
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Summary:Fatigue crack propagation was studied in MF-80 HSLA steel in ambient room air and in 3.5 percent NaC1 salt water. Region-II fatigue crack growth rate (da/dN) data were obtained at two load ratios, R=0.10 and R = 0.67. da/dN values were found to be affected by both load ratio and environment, with the greatest effect being caused by the combination of high load ratio and salt water environment. Overall, the results of this study suggest that MF-80 HSLA steel may have slightly less Region-II fatigue crack propagation resistance than other high-strength steels of comparable strength.