2022
DOI: 10.3390/met12040673
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Effect of Internal Hydrogen on the Fatigue Crack Growth Rate in the Coarse-Grain Heat-Affected Zone of a CrMo Steel

Abstract: The effect of internal hydrogen in the fatigue crack growth rate of the coarse grain region of a 2.25Cr1Mo steel welded joint was analyzed in this work. The microstructure of the coarse grain region was simulated by means of a heat treatment able to provide the same microstructure with a similar prior austenite grain size and hardness to the one in a real welded joint. The fatigue crack growth rate was measured under standard laboratory conditions using compact tensile (CT) specimens that were (i) uncharged an… Show more

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Cited by 8 publications
(5 citation statements)
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“…The fracture surface SEM image of the as-received sample is shown in Figure 13C and D. The micromechanism leading to the fracture along the crack growth line is expected to be predominantly ductile, characterized by MVC. Figure 13C clearly shows visibly large dimples and several fine dimples, similar to features reported by Zafra et al 45 and Alvarez et al 78 for uncharged CrMo steel.…”
Section: Fracture Toughnesssupporting
confidence: 86%
“…The fracture surface SEM image of the as-received sample is shown in Figure 13C and D. The micromechanism leading to the fracture along the crack growth line is expected to be predominantly ductile, characterized by MVC. Figure 13C clearly shows visibly large dimples and several fine dimples, similar to features reported by Zafra et al 45 and Alvarez et al 78 for uncharged CrMo steel.…”
Section: Fracture Toughnesssupporting
confidence: 86%
“…The next two contributions study fatigue crack growth rates under environmental effects. Álvarez et al [4] investigate the effect of internal hydrogen on the fatigue crack growth rate of the coarse grain region of a 2.25Cr1Mo steel welded joint. The fatigue crack growth rate was measured in the compact tensile specimens of base materials and coarse-grain heat-affected zones, with different stress ratios and frequencies.…”
Section: Contributionsmentioning
confidence: 99%
“…The umbrella term HE covers a multitude of different failure mechanisms [10,11] which are best categorized by the respective sources of hydrogen ingress. Thus, Internal Hydrogen Embrittlement (IHE) refers to failures caused by hydrogen from manufacturing processes such as casting (pores and "fish eyes"), welding or heat treatment [8,9,12]. Damage might emerge during manufacturing or as delayed fracture when a hydrogen-containing component is put under operating stresses.…”
Section: Introductionmentioning
confidence: 99%