Multicyclic fatigue of stainless steel treated by a high-intensity electron beam: surface layer structure

Ivanov, Yu. F.; Koval, N. N.; Горбунов, С. В.; Vorobyov, S. V.; Konovalov, S. V.; Gromov, V. Е.

doi:10.1007/s11182-011-9654-8

Cited by 31 publications

(9 citation statements)

References 6 publications

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“…Forms and sizes of samples used in fatigue testing were similar to those in studies [ 26 , 28 ] and are shown in Figure 1 . To be precise, they were prepared as a parallelepiped with dimensions of 8 × 14 × 145 mm.…”

Section: Methodsmentioning

confidence: 66%

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

et al. 2020

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Research was carried out to explore the effect of pulsed electron beam irradiation on the behavior of structure and phase state in AISI 310S steel exposed to high-cycle fatigue. A 2.2 times increase in the fatigue life of samples irradiated by electron beams was revealed. The outcomes of scanning and transmission electron microscopic studies suggest the most probable reason for the fracture of steel samples irradiated by a high-intensity electron beam to be microcraters originating on a treated surface and acting as stress risers initiating the propagation of microcracks. The irradiation with a pulsed electron beam causes extremely fast melting of the surface. As a result of the subsequent rapid crystallization, a polycrystalline structure nearly twice as small as an average grain in the untreated steel is formed. Since a surface layer crystallizes rapidly, crystallization cells ranging from 120 to 170 nm develop in the volume of grains. The fatigue testing is shown to be associated with a martensite transformation γ ⇒ ε in the surface layer. One option to intensify a fatigue life increase of the steel in focus is supposed to be the neutralization of crater-forming on a surface treated by electron beams.

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Section: Methodsmentioning

confidence: 66%

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

et al. 2020

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“…Various methods to form gradient structures have been discussed in some publications. For example, the surface modification (for instance, by concentrated flows of charged particles) has been widely applied to increase fatigue life [ 12 , 13 , 14 ]. However, according to the authors, the approaches based on the initiation of shear strains under the highly constraint conditions are of the greatest interest.…”

Section: Introductionmentioning

confidence: 99%

Increasing Fatigue Life of 09Mn2Si Steel by Helical Rolling: Theoretical–Experimental Study on Governing Role of Grain Boundaries

et al. 2020

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The structure and mechanical properties of the 09Mn2Si high-strength low-alloyed steel after the five-stage helical rolling (HR) were studied. It was revealed that the fine-grained structure had been formed in the surface layer ≈ 1 mm deep as a result of severe plastic strains. In the lower layers, the “lamellar” structure had been formed, which consisted of thin elongated ferrite grains oriented in the HR direction. It was shown that the five-stage HR resulted in the increase in the steel fatigue life by more than 3.5 times under cyclic tension. The highest values of the number of cycles before failure were obtained for the samples cut from the bar core. It was demonstrated that the degree of the elastic energy dissipation in the steel samples under loading directly depended on the area of the grain boundaries as well as on the grain shapes. The fine-grained structure possessed the maximum value of the average torsional energy among all the studied samples, which caused the local material structure transformation and the decrease in the elastic energy level. This improved the crack resistance under the cyclic mechanical loading. The effect of the accumulation of the rotational strain modes at the grain boundaries was discovered, which caused the local structure transformation at the boundary zones. In the fine-grained structure, the formation of grain conglomerates was observed, which increased the values of the specific modulus of the moment of force. This could be mutually compensated due to the small sizes of grains. At the same time, the coarse-grained structures were characterized by the presence of the small number of grains with a high level of the moments of forces at their boundaries. They could result in trans-crystalline cracking.

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“…Few studies have paid attention to differences in fatigue resulting from the load [3][4][5][6][7][8][9][10][11][12]. A different fatigue life may correspond, as a result, to the same strain or stress curve.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

2020

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In this study, we created a new model to determine strain fatigue characteristics obtained from a bending test. The developed model consists of comparing the stress and strain gradient surface ratio for bending and tensile elements. For model verification, seven different materials were examined based on fatigue tests we conducted, or data available in the literature: 30CrNiMo8, 10HNAP, SM45C, 16Mo3 steel, MO58 brass, and 2017A-T4 and 6082-T6 aluminum alloys. As a result, we confirmed that the proposed method can be used to determine strain fatigue characteristics that agree with the values determined on the basis of a tensile compression test.

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Multicyclic fatigue of stainless steel treated by a high-intensity electron beam: surface layer structure

Cited by 31 publications

References 6 publications

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

Increasing Fatigue Life of 09Mn2Si Steel by Helical Rolling: Theoretical–Experimental Study on Governing Role of Grain Boundaries

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

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