EFFECTS OF HYDROGEN ON THE MECHANICAL PROPERTIES OF STEEL**Prepared in collaboration with E. Gasior.

Smialowski, M.

doi:10.1016/b978-0-08-009697-1.50011-9

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…e microhardness distribution method is also an important method for measuring the distribution of hydrogen in metals. Many scholars have proved that the Vickers hardness increases as the hydrogen content increases in metals [23][24][25][26][27][28]. Furthermore, quite a few scholars have proved that the determination of hydrogen diffusivities in metals by subscale microhardness profiling is a versatile technique that can be used to obtain hydrogen diffusivities with simple experimentation; that is, the increase in hydrogen concentration is proportional to the increase in hardness [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Hydrogen Distribution in Stress Environment Using Vickers Microhardness Technique

Wang

et al. 2018

Advances in Materials Science and Engineering

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In this paper, the stress distribution field in front of the crack tip was obtained by loading a modified WOL specimen using a bolt. Considering the relationship between microhardness and hydrogen content or internal stress in the metal, a model based on the change of microhardness increment is proposed to describe the trend of hydrogen concentration distribution in the stress environment. The agreement between theoretical model and experimental results is verified by the Vickers microhardness tester. Based on the model, there is a simple additive relationship between the hydrogen-induced microhardness increment and the stress-induced microhardness increment. Therefore, the microhardness tester can be employed to evaluate the hydrogen distribution in metals quantitatively. The experimental results demonstrated that the Vickers microhardness method has accurately revealed the hydrogen concentration behavior accurately in a known equibiaxial stress environment. The hydrogen distribution of specimens in the stress environment was analyzed by taking the change of the microhardness increment along the crack propagation direction of specimens as the indicator.

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Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Hydrogen Distribution in Stress Environment Using Vickers Microhardness Technique

Wang

et al. 2018

Advances in Materials Science and Engineering

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Mechanisms of corrosion fatigue below K Iscc

Barsom¹

1971

Int J Fract

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Information on corrosion-fatigue crack growth in engineering structures is necessary for the prediction of service lives of structures subjected to both fatxgue loading and an aggressive environment. The rate of crack growth m corrosion fatigue is governed by the interaction between the chemical mechamsms and the mechanical mechanisms occurring at the crack tip. Thus, as part of a long-range program aimed at establishing the necessary relations for predicting the corrosion-fatigue behavior of structural steels, the crack-tip mechanisms in corrosion fatigue were studied by using controlled-potential techniques, pH measurements at the crack tip, and fractographic analysis of the crack surface.The tests were conducted on 12Ni-5Cr-3Mo maraging steel at a cyclic-stress frequency equal to 6 cycles per minute in a room-temperature pH 7, 3 percent solution of sodium chloride.The results showed that the controlled-potential techmque is inadequate for isolating the crack-tip mechamsms in thick specimens subjected to fatigue loading and an aggressive environment. At the crack tip the pH was 3. In addition, localized neighboring regions of basic and acldac solutions were observed in the proximity of the central portion of the crack tip. Hence, it is concluded that the effectiveness of cathodic protectmn decreases as the crack front moves away from the flee surface. The fractographac tests showed that hydrogen embrittlement is the primary mechanism responsible for acceleration of fatigue cracks in 12Ni-5Cr-3Mo steel in 3 percent sodium chloride solutmn.Finally, by using the corrosion-fatigue crack-propagation lawwhere da/dN is crack-growth rate per cycle, b is the crack-opening displacement, ay is the yield strength, and D(t) is a time-or frequency-dependent functmn, it is shown that, for the environment-material system investigated, hydrogen embrittlement accelerates corrosion-fatigue crack propagation by changing the ductility of the material (or 6). Introd~'tionSubcritical crack growth in corrosion fatigue may be divided into two components: one caused by cyclic stresses and the other caused by the environment. The cyclic-stress component has been thoroughly investigated, and it is generally accepted that it is caused by the mechanisms of plastic deformation at the crack tip [14]. However, the chemical mechanisms at the crack tip that increase crack growth in corrosion fatigue are yet to be investigated in detail. Most investigations on the influence of the environment on subcritical crack growth in highstrength steels have been designed to determine the existence of environmental effects in a given environment-material system [5][6][7][8][9][10][11][12][13]. Furthermore, in these investigations, the effect of the environment on crack growth was studied in terms of either time to failure or in terms of the change in crack-growth rates.In a recent investigation on the corrosion-fatigue behavior below K1~c of 12Ni-5Cr-3Mo maraging steel in a room-temperature 3 percent solution of sodium chloride, Barsom [14,15] showed (Figur...

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Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys

Meyn

1974

Metall Trans

123

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EFFECTS OF HYDROGEN ON THE MECHANICAL PROPERTIES OF STEEL**Prepared in collaboration with E. Gasior.

Cited by 3 publications

References 49 publications

Measurement and Analysis of Hydrogen Distribution in Stress Environment Using Vickers Microhardness Technique

Measurement and Analysis of Hydrogen Distribution in Stress Environment Using Vickers Microhardness Technique

Mechanisms of corrosion fatigue below K Iscc

Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys

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