Abstract
Sensitivity to small defects under torsional fatigue loading condition is examined in the high cycle fatigue regime. Fatigue crack initiation and small crack growth behaviors were observed during fatigue testing and fractographic investigations were performed. The results are compared to the data obtained in the uniaxial fatigue tests, which allows the effect of biaxial stresses on the surface of material to be discussed. Finally, an approach for predicting the fatigue limit of 17-4PH stainless steel under torsional and tension-compression fatigue loadings is presented.
Highlights
P recipitation-hardened chromium-nickel-copper stainless steel 17-4PH possesses high strength, toughness and good corrosion resistance
Sensitivity to small defects under torsional fatigue loading condition is examined in the high cycle fatigue regime
The results are compared to the data obtained in the uniaxial fatigue tests, which allows the effect of biaxial stresses on the surface of material to be discussed
Summary
P recipitation-hardened chromium-nickel-copper stainless steel 17-4PH possesses high strength, toughness and good corrosion resistance. In the last few decades, a number of investigations on the uniaxial fatigue properties of 17-4PH have been performed; no results of torsional fatigue tests are presently available. Material sensitivity to small defects under torsional fatigue loading condition is examined in the high cycle fatigue regime. The results are compared to the data obtained in the tension-compression fatigue tests and the effects of biaxial stresses on the surface of material are discussed. The experimental data are evaluated to examine the predictive approach (cf [3,4,5,6,7]) for the fatigue strength of 17-4PH stainless steel under torsional and tension-compression fatigue loadings. The testing material used in the present investigation was a chromium-nickel-copper stainless steel 17-4PH precipitation hardened at 913 °C and age hardened at 621 °C for 4 h (condition H1150).
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