Corrosion fatigue of type 4140 high strength steel

Corrosion fatigue of three steels namely: AISI 1018, AISI 4340 and 17-7 PH stainless steel are investigated in various environments. Testing mediums chosen are natural seawater, polluted sea water from an industrial site, drinking tap water produced by desalination process, 4% sodium chloride tap water solution and a laboratory air environment. Results obtained for the three steels are consistent in pointing out that pollutants in seawater do not contribute to an acceleration of corrosion fatigue. The aggressiveness of drinking water is attributed to its chemical instability, low alkalinity and bicarbonate content.

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“…Similar results were obtained in Ref. [23] from testing AISI 4140 steel that was heat treated to various tensile strengths in 3% NaCl solution.…”

Section: Discussionsupporting

confidence: 86%

Corrosion Fatigue of Steel in Various Aqueous Environments

Ragab

Alawi

Sorein

1989

Fatigue Fract Eng Mat Struct

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“…Note that the oxide-induced crack closure effect does not dominate the influence of the atmosphere: the average lifetime of specimens tested in argon is longer than that of specimens tested in lab air all else being equal, Section 5. A momentous difference has also been registered between dry air and humid air [93]. This effect has been reported to be pronounced in quenched 42CrMo4 steels [93].…”

Section: Extrinsic Effectsmentioning

confidence: 71%

On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4

Geilen

Schönherr

Klein

et al. 2020

Metals

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In this study, we investigate the influence of control type and strain rate on the lifetime of specimens manufactured from 50CrMo4. This influence is described by a strain rate dependent method that uses cyclic stress strain curves to correct displacement-controlled cyclic test results. The objective of this correction is to eliminate the stress related differences between displacement-controlled cyclic test results and force-controlled cyclic test results. The method is applied to the results of ultrasonic fatigue tests of six different combinations of heat treatment, specimen geometry (notch factor) and atmosphere. In a statistical analysis, the corrected results show an improved agreement with test results obtained on conventional fatigue testing equipment with similar specimens: the standard deviation in combined data sets is significantly reduced (p = 4.1%). We discuss the literature on intrinsic and extrinsic strain rate effects in carbon steels.

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“…Although a significant number of studies have been carried out on fatigue and corrosion behaviour of high strength steels, most of these studies were carried out in 3.5% NaCl solutions [46,[48][49][50][51][52][53] in boiling sodium hydroxide [54], in gaseous hydrogen [55]. Fatigue behaviour of 4140 has also been investigated on the effect of magnetic treatment [56] and on the effect of ion nitriding [57].…”

Section: Hydrogen Embrittlement Mechanismsmentioning

confidence: 99%

Influence of dissolved hydrogen on the fatigue crack growth behaviour of AISI 4140 steel

Nagarajan

2014

International Journal of Fatigue

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Corrosion fatigue of type 4140 high strength steel

Cited by 52 publications

References 6 publications

Corrosion Fatigue of Steel in Various Aqueous Environments

Corrosion Fatigue of Steel in Various Aqueous Environments

On the Influence of Control Type and Strain Rate on the Lifetime of 50CrMo4

Influence of dissolved hydrogen on the fatigue crack growth behaviour of AISI 4140 steel

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