The effects of fatigue loading frequency (f), sensitization, and crack length on corrosion fatigue crack growth rates (da/dN) were investigated for AA5456-H116 under full immersion in 3.5 wt% NaCl. Results from fracture mechanics-based experiments conducted at a constant stress-intensity range (ΔK) and load ratio (R) suggest that highly sensitized AA5456-H116 microstructures (ASTM G67 nitric acid mass loss tests [NAMLT] value of 24 mg/cm2 and higher) exhibit increased da/dN over microstructures in the as-received condition (NAMLT 5 mg/cm2) and the onset of an inverse f-dependence. For a single, high level of sensitization (70 mg/cm2), da/dN increased 3.5× as f decreased from 10 Hz to 0.03 Hz. At a singular low loading f of 0.03 Hz, high sensitization levels (65 mg/cm2) accelerated da/dN fivefold over da/dN in the as-received condition. The da/dN of microstructures below a critical NAMLT value of 24 mg/cm2 were f-independent. Specifically, in microstructures with a low sensitization level (ASTM G67 NAMLT value less than 24 mg/cm2), there was no increase in da/dN as f decreased from 1 Hz to 0.03 Hz. At any singular f, sensitization up to 24 mg/cm2 did not accelerate da/dN over the rate in an as-received microstructure. Additional testing established that the inverse f-dependence of da/dN observed in highly sensitized microstructures cannot be attributed to crack length effects. Two hypotheses are discussed that may explain the observed inverse relationship between f and da/dN in microstructures at or above the critical NAMLT value of 24 mg/cm2.
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1 January 2020
SCIENCE SECTION|
November 20 2019
The Effects of Loading Frequency, Sensitization, and Crack Length on Corrosion Fatigue of AA5456-H116
D.J. Schrock;
D.J. Schrock
‡
*Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210.
‡Corresponding author. E-mail: [email protected].
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J.S. (Warner) Locke
J.S. (Warner) Locke
*Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210.
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CORROSION (2020) 76 (1): 63–70.
Article history
Received:
August 27 2019
Revision Received:
November 20 2019
Accepted:
November 20 2019
Citation
D.J. Schrock, J.S. (Warner) Locke; The Effects of Loading Frequency, Sensitization, and Crack Length on Corrosion Fatigue of AA5456-H116. CORROSION 1 January 2020; 76 (1): 63–70. doi: https://doi.org/10.5006/3366
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