Cyclic crack resistance of constructional steels in gaseous hydrogen

Romaniv, O. N.; Nikiforchin, G. N.; Kozak, L. Yu.

doi:10.1007/bf00723489

Cited by 9 publications

(3 citation statements)

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“…With decreasing frequency, the influence of hydrogen on the FCG rates became more significant. Some researchers (Macadre et al, 2011;Musuva & Radon, 1979;Romaniv et al, 1987) found the same trend. Figure 7 is an example graph illustrating the accelerated FCG rate at lower frequency in the presence of hydrogen.…”

Section: Fcg Ratementioning

confidence: 56%

A critical review of the influence of hydrogen on the mechanical properties of medium-strength steels

2013

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As medium-strength steels are promising candidates for the hydrogen economy, it is important to understand their interaction with hydrogen. However, there are only a limited number of investigations on the behavior of medium-strength steels in hydrogen. The existing literature indicates that the influences of hydrogen on the tensile properties of medium-strength steels are mainly the following: (i) the steel can be hardened by hydrogen, as demonstrated by an increase in the yield stress or ultimate tensile stress; (ii) some steels can be embrittled by hydrogen, as revealed by lower yield stress or ultimate tensile stress; (iii) in most cases, these steels may experience hydrogen embrittlement (HE), as indicated by a reduction in ductility. The degree of HE mainly depends on the test conditions and the steel. The embrittlement can lead to catastrophic brittle fracture in service. The influence of hydrogen on the fatigue properties of medium-strength steels is dependent on many factors such as the stress ratio, temperature, yield stress of the steel, and test frequency. Generally, the hydrogen influence on fatigue limit is small, whereas hydrogen can accelerate the fatigue crack growth rate, leading to a shorter fatigue life. Inclusions are an important factor influencing the properties of medium-strength steels in the presence of hydrogen. However, it is not possible to predict the influence of hydrogen for any particular steel that has not been experimentally evaluated or to predict service performance. It is not known why similar steels can have different behavior, ranging from good resistance to significant embrittlement. A better understanding of the microstructural characteristics is needed.

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Section: Fcg Ratementioning

confidence: 56%

A critical review of the influence of hydrogen on the mechanical properties of medium-strength steels

2013

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“…The operation of many structures-particularly, steam and hydrogen turbine rotors, cooling infrastructures of powerful semiconductor devices and industrial singlecrystal growth applications [3][4][5][6][7][8][9][25][26][27][28][29][30][31][32][33][34]45,[55][56][57][58][59][79][80][81][82][83][84][85][86][87][88][89][90][91]110]-is accompanied by their cyclic loads, which often exceed the yield strength of the material [52,[54][55][56], based on understanding the hydrogen embrittlement of materials from the atomistic level to the continuum [100][101][102][103][123][124][125]…”

Section: Hydrogen Influence On the Welded Joint Durability Under Cycl...mentioning

confidence: 99%

Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints

et al. 2022

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This article is devoted to the following issues: calculating the values of temperatures obtained by simulating welding heating and the subsequent implementation of the welding process at the given mode parameters made it possible to obtain a welded joint of the rotor with an improved initial structure and increased mechanical properties, hydrogen resistance and durability by up to 10–15%; simulating welding heating in the areas of fusion, the overheating and normalization of the HAZ and the formation of austenite grains; specified welding heating creates the conditions for the formation of new products of austenite decomposition in the form of sorbitol in the area of the incomplete recrystallization of the HAZ. In air and gaseous hydrogen, the destruction of the combined joints took place on the weld metal, as well as on the fusion areas, the overheating and the incomplete recrystallization of the HAZ of 20H3NMFA steel as the base metal. Structural materials have a relatively low strength and high fracture toughness in air. This is manifested in a significant reduction in the elongation (δ), the area (ψ) and critical stress intensity factor (KIc) of welded joints and the endurance limit of cylindrical smooth rotor steel specimens, which were cut from transverse templates. Welded joints in the whole range of load amplitudes are sensitive to the action of hydrogen.

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“…With decreasing frequency, the influence of hydrogen on the FCG rates became more significant. Some researchers (Macadre et al, 2011;Romaniv et al, 1987) found the same trend. Figure 7 is an example graph illustrating the accelerated FCG rate at lower frequency in the presence of hydrogen.…”

Section: Fcg Ratementioning

confidence: 53%

Influence of hydrogen on metallic components for clean energy

Liu¹

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Hydrogen can degrade the mechanical properties, particularly ductility, of metallic components. These hydrogen-induced degradation phenomena are generically called as Hydrogen Embrittlement (HE). There are significant problems associated with the HE of metallic components for clean energy. The scale is global and the present paucity of affordable hydrogen-proof materials poses strong technological and economic barriers to the hydrogen economy. Therefore, this doctoral dissertation aims to provide a deeper understanding of the influence of hydrogen on the properties of the targeted steels (NiCrMo1, 3.5NiCrMoV, 27NiCrMoV15-6 and 34CrNiMo6). These steels are typical quench and tempered steels, with strengths in the range of 700 to 1000 MPa. This dissertation comprises the following research works: (i) The influence of hydrogen on the tensile properties of the targeted steels; (ii) The influence of hydrogen on the fatigue properties of the typical steel-3.5NiCrMoV; (iii) The determination of the hydrogen fugacity during electrochemical charging at cathodic potentials using the low interstitial steel; (iv) The permeability of hydrogen and trapping effect on 3.5NiCrMoV steel. This research used the following techniques: optical microscopy, scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electrochemical polarization, linearly increasing stress test (LIST), low cycle fatigue (LCF), fatigue crack growth (FCG) test, and permeation test. The LIST results indicated that all these four steels have good resistance to hydrogen embrittlement up to the yield stress, especially NiCrMo1, and each failed in the LISTs due to ductile overload. There was some HE, but only during the final ductile fracture, when the steel was mechanically unstable. HE was manifest in terms of the slightly lower value of R A %, the longer secondary cracks, the daisy-like surface features, and the brittle zone at the edge on the fracture surface. Lower ductility occurred associated with alumina oxide inclusions in the centre of daisy-like features. It is expected that the performance of the steels in a H environment could be improved by reducing the density or the size of inclusions. The main result from the LCF tests was that the reduction in fatigue life was significant for 3.5NiCrMoV, by about 60% ~ 90% in the presence of hydrogen, in terms of shortening the crack initiation period and accelerating the crack growth rate. There was no significant Publications during candidature

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Cyclic crack resistance of constructional steels in gaseous hydrogen

Cited by 9 publications

References 10 publications

A critical review of the influence of hydrogen on the mechanical properties of medium-strength steels

A critical review of the influence of hydrogen on the mechanical properties of medium-strength steels

Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints

Influence of hydrogen on metallic components for clean energy

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