The significance of grain size, segregations and inclusions for the very high cycle fatigue (VHCF) behavior of tempered martensitic steels

Krupp, Ulrich; Koschella, Kevin; Giertler, Alexander

doi:10.1016/j.prostr.2020.01.138

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…High density grain boundaries played a significant role in hindering the dislocation slip during deformation, which effectively improved the effect of dislocation strengthening and inhibited the initiation and propagation of cracks [30]. This work confirmed previous studies on fatigue behavior of martensitic steels , that is, martensite packet and block boundaries were efficient microstructural barriers for crack growth [31]. After the QTQT treatment, the grain boundary density and the proportion of high-angle grain boundary for tested steel increased.…”

Section: Effect Of the Microstructure Refinement On The Fatigue Fract...supporting

confidence: 86%

Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

Zhang

Gao²,

Wang³

et al. 2022

Mater. Res. Express

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The relationship between microstructure, stress ratio, and fatigue fracture behavior of high-strength steel for flexible marine risers was investigated by microstructure characterization and fatigue test. The microstructure characteristic, S-N curve, fatigue fracture morphology, and fatigue crack morphology after quenching and tempering treatment and cyclic heat treatment, respectively, were evaluated. The results revealed that after cyclic heat treatment, the microstructure was refined considerably, the grain boundary density and the content of high-angle grain boundary increased, which inhibited the fatigue crack propagation and improved the fatigue strength. The average stress increased by increasing the stress ratio, which promoted the crack initiation and propagation; consequently, the fatigue strength and fatigue life of the tested steel decreased.

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Section: Effect Of the Microstructure Refinement On The Fatigue Fract...supporting

confidence: 86%

Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

Zhang

Gao²,

Wang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…The design life and service time of bearings also increase dramatically. In certain areas, such as high-speed rail, power generation, and aerospace industry, the demand for the fatigue life of bearings exceeds 10 9 [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

Liu

Lian

et al. 2021

Int J Miner Metall Mater

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A numerical study of stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions was conducted with finite element modeling simulations under different assumptions. Fatigue mechanisms were also analyzed accordingly. The results showed that the effects of inclusions on fatigue life will distinctly decrease if the mechanical properties are close to those of the steel matrix. For the inclusions, which are tightly bonded with the steel matrix, when the Young's modulus is larger than that of the steel matrix, the stress will concentrate inside the inclusion; otherwise, the stress will concentrate in the steel matrix. If voids exist on the interface between inclusions and the steel matrix, their effects on the fatigue process differ with their positions relative to the inclusions. The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of inclusions on fatigue behavior and lead to a sharp stress concentration. The void on the top of inclusion along the fatigue loading direction will accelerate the debonding between the inclusion and steel matrix.

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“…With the development of advanced industry, the requirements for bearing steel quality have sharply increased, and the design life and service time of bearing have greatly increased. In some fields, such as the high-speed railway, power generation, and aerospace industries, the demand for bearing fatigue life exceeds 10 9 [3][4][5]. Although many factors contribute to fatigue defects in bearings, nonmetallic inclusion is an important factor affecting the fatigue life of bearing steel.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of the Formation of Non-Metallic Inclusions during the Deoxidation of GCr15 Bearing Steel

Cao,

Zhu,

Zhao

et al. 2023

Metals

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The non-metallic inclusions in steel mainly come from the deoxidization process of molten steel. Based on the different deoxidization processes of GCr15 bearing steel produced by a domestic steel plant, the single deoxidization curves of Al, Si, and Mn and the compound deoxidization curves of Al-Si and Si-Mn under pure molten iron and GCr15 bearing steel production conditions were calculated with the FactSage 8.1 thermodynamic software. The results show that the deoxidization curves under the two conditions are quite different. At the same time, the Al-Ti deoxidation equilibrium curve under the condition of GCr15 bearing steel was calculated. It was found that when [Ti] < 0.0015% in the steel, the equilibrium deoxidation product was Al2O3, and no titanium oxide was generated. Finally, a thermodynamic calculation and analysis of the effect of rare-earth Ce content on the modification of inclusions in GCr15 bearing steel were carried out. The results showed that when T = 1873 K, the rare-earth Ce treatment of aluminum deoxidized the GCr15 bearing steel; when [Al] = 0.015%, Al2O3 inclusions increased with the increase in [Ce] content, and the evolution path was Al11O18Ce→CeAlO3→Ce2O3. When [Si] = 0.28%, [O] > 50 ppm, and CeCrO3 and [O] 0.012% appeared. CeS inclusions appeared in the steel, and the final equilibrium product was CeS + Ce2O3. When [Ce] < 0.012%, CeS was not produced in the steel, and only Ce2O3 existed.

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The significance of grain size, segregations and inclusions for the very high cycle fatigue (VHCF) behavior of tempered martensitic steels

Cited by 5 publications

References 7 publications

Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

Fatigue fracture behavior of high-strength low-alloy steel for flexible marine riser in the high cycle fatigue regime

In-depth analysis of the fatigue mechanism induced by inclusions for high-strength bearing steels

Thermodynamics of the Formation of Non-Metallic Inclusions during the Deoxidation of GCr15 Bearing Steel

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