Effect of electroless nickel interlayer on the fatigue strength of chromium electroplated AISI 4340 steel

Voorwald, Herman Jacobus Cornelis; Padilha, R. Q.; Costa, Midori Yoshikawa Pitanga; Pigatin, Walter Luis; Cioffi, Maria Odila Hilário

doi:10.1016/j.ijfatigue.2006.07.004

Cited by 53 publications

(21 citation statements)

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“…The effects of residual stresses (Ref [1][2][3][4][5][6], interface properties (Ref 7,8), or failure mode of the coatings (Ref [9][10][11] were investigated. Despite the number of articles published, the actual damage scenario of many types of coating-substrate composites is still not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth in Bodies with Thermally Sprayed Coating

et al. 2015

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Many applications of thermally sprayed coatings call for increased fatigue resistance of coated parts. Despite the intensive research in this area, the influence of coating on fatigue is still not completely understood. In this paper, the localization of crack initiation sites and the dynamics of crack propagation are studied. The resonance bending fatigue test was employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical thermal barrier coating consisting of yttria stabilized zirconia and NiCoCrAlY layers. The strain distribution on the coating surface was evaluated by the Digital Image Correlation method through the whole duration of the fatigue test. Localization of crack initiation sites and the mode of crack propagation in the coated specimen are related to the observed resonance frequency. The individual phases of specimen degradation, i.e., the changes of material properties, crack initiation, and crack propagation, were identified. The tested coatings strongly influenced the first two phases, and the influence on the crack propagation was less significant. In general, the presented crack detection method can be used as a sensitive nondestructive testing method well suited for coated parts.

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Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth in Bodies with Thermally Sprayed Coating

et al. 2015

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“…[18,19] in the coating layer. [20,21] The other solution, which the authors believe to be more appropriate, is to accelerate fatigue tests by means of ultrasonic fatigue testing at 20 kHz. [22][23][24][25][26] Ultrasonic fatigue testing takes only 14 hours to reach 10 9 cycles, so fatigue strength readings even up to the gigacycle range can be obtained before the specimens lose most of their hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Gigacycle Fatigue Properties of Hydrogen-Charged JIS-SCM440 Low-Alloy Steel Under Ultrasonic Fatigue Testing

Furuya

Hirukawa

Hayakawa

2010

Metall Mater Trans A

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YOSHIYUKI FURUYA, HISASHI HIRUKAWA, and MASAO HAYAKAWA Gigacycle fatigue tests were conducted on hydrogen-charged low-alloy steel. In this study, highand low-strength specimens were prepared to investigate the effects of hydrogen on internal and surface fractures, respectively. The fatigue tests were conducted mainly by ultrasonic fatigue testing at 20 kHz and additionally by conventional servohydraulic fatigue testing at 50 Hz. All high-strength specimens revealed internal fractures. The fatigue strength of the hydrogencharged specimens was much lower than that of the uncharged specimens. In the low-strength specimens, the uncharged specimens revealed surface fractures in the short-life regions in addition to internal fractures in the long-life regions. However, the hydrogen-charged specimens revealed internal fractures only that were combined with a much lower fatigue strength. The difference in fracture surfaces was small between the hydrogen-charged and the uncharged specimens, whereas the optically dark areas of the hydrogen-charged specimens seemed smaller than those of the uncharged specimens.

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“…8d. From the literature it is well know that aluminum oxide particles in most cases are incorporated in the titanium and in this case acts as stress concentrator, reducing the fatigue strength [29,30].…”

Section: Resultsmentioning

confidence: 99%