Hydrogen-induced cracking and blistering in α-BRASS

Panagopoulos, C.N.; El-Amoush, Amjad Saleh; Agathocleous, P.E.

doi:10.1016/s0010-938x(98)00080-8

Cited by 17 publications

(8 citation statements)

References 7 publications

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“…[47] Feeding all these values into Eq. [9], the migration frequency of a vacancy in Fe and Cu is k v (Fe) = 3 s -1 and k v (Cu) = 143 s -1 , respectively, and the migration frequency of a hydrogen atom in Ni and Pd is k H (Ni) = 1.56 · 10 7 s -1 and k H (Pd) = 5.16 · 10 9 s -1 , respectively. Therefore, hydrogen atoms and vacancies can migrate freely in these metals at room temperature.…”

Section: Migration Of Hydrogen Atoms and Vacanciesmentioning

confidence: 99%

“…[7,8] Furthermore, hydrogen blister or crack appears in many other materials in the absence of external stress if the hydrogen concentration is high enough. Panagopoulos et al [9] observed the cracking and blistering of a-brass induced by cathodic hydrogen charging. The blisters in AISI 304 [10] and 430 [11] stainless steel induced by cathodic hydrogen charging has been reported.…”

Section: Introductionmentioning

confidence: 99%

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A Nucleation Mechanism of Hydrogen Blister in Metals and Alloys

Ren

Zhou

Shan

et al. 2007

Metall Mater Trans A

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The nucleation process of hydrogen blister in metals was investigated through experiments and the mechanism was discussed. Small hydrogen blister in charged Ni-P amorphous coating and steel was studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermodynamics and kinetics of hydrogen and vacancies in metals are analyzed. Further, an approach of the nucleation mechanism of hydrogen blister is proposed as follows. Atomic hydrogen can induce superabundant vacancies in metals. The superabundant vacancies and hydrogen aggregate into a hydrogen-vacancy cluster (small cavity). The hydrogen atoms in the hydrogen-vacancy cluster become hydrogen molecules that can stabilize the cluster. And the hydrogen blister nucleates. The pressure in the small cavity increases as the hydrogen atoms enter the cavity. The cluster, that is, the hydrogen blister nucleus, grows through vacancies diffusing into it under the action of cluster-hydrogen binding energy and hydrogen pressure. When the blister nucleus grows to a critical size C cr cracks will initiate from the wall of the cavity due to the internal hydrogen pressure.

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Section: Migration Of Hydrogen Atoms and Vacanciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Nucleation Mechanism of Hydrogen Blister in Metals and Alloys

Ren

Zhou

Shan

et al. 2007

Metall Mater Trans A

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“…This behavior can be explained by the occurrence of two antagonistic phenomena during hydrogen uptake. On one hand, the hardness and subsequently the UTS (σ ≈ 2.9 HV) of the alloy increases by the dislocation pinning mechanisms [27], whereas on the other hand the formation of micro-cracks and blisters (see Figure 5) degrades the mechanical properties of the material [28]. Thus, depending on balance between these two phenomena, a different behavior in the UTS can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…This observation is believed to be the result of the higher diffusion and trapping of hydrogen in the rolled alloys, as explained previously. Indeed, the absorbed hydrogen atoms can hinder the movement of dislocations and thus decrease the ductility of the alloy, whereas the presence of blisters and micro-cracks on the surface of the alloy [27] further decrease the ductility [28] of this material.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Cold Rolling on the Hydrogen Susceptibility of 5083 Aluminum Alloy

Georgiou

Celis

Panagopoulos

2017

Metals

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This work focuses in investigating the effect of cold deformation on the cathodic hydrogen charging of 5083 aluminum alloy. The aluminium alloy was submitted to a cold rolling process, until the average thickness of the specimens was reduced by 7% and 15%, respectively. A study of the structure, microhardness, and tensile properties of the hydrogen charged aluminium specimens, with and without cold rolling, indicated that the cold deformation process led to an increase of hydrogen susceptibility of this aluminum alloy.

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“…Panagopoulos et al [3] found that hydrogen cathodic charging of ␣-brass could result in the formation of intergranular and transgranular microcracks and hydrogen blisters. They observed that, increasing the current density resulted in more severe cracks and in an increase in the number of blisters.…”

Section: Introductionmentioning

confidence: 99%