Evolution of Dislocation Structure and Fatigue Crack Behavior in Fe-Si Alloys during Cyclic Bending Test

Ushioda, Kohsaku; Goto, Shoji; Komatsu, Yoshinari; Hoshino, Akinori; Takebayashi, S.

doi:10.2355/tetsutohagane.94.321

Cited by 6 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, strictly speaking, the (1 10) wall is not able to be formed by the real reaction expressed by Eq. (2). Nevertheless, the Li model seemed to be valid in terms of understanding the crystallographic orientation relationship between the active dislocations and the walls.…”

Section: Discussionmentioning

confidence: 99%

“…The dislocation wall is formed in an Fe-Si alloy rather than in pure Fe. 2) Polycrystalline Fe-Si ingot was prepared in a vacuum induction furnace. Table 1 presents the chemical composition of the ingot.…”

Section: Methodsmentioning

confidence: 99%

“…Yokoi et al 1) reported that the formation of a dislocation cell structure is suppressed in an Fe-1.5 mass%Cu alloy showing a higher fatigue strength than Fe. Ushioda et al 2) also found that dislocation cells are hard to form, and dislocation veins and dislocation walls are preferentially formed in Fe alloys containing 0.5-1 mass% of Si, which are known to have a higher fatigue strength than Fe. Shuto and Yokoi 3) compared the fatigue limit and the dislocation structures of an Fe-0.5 mass%Si alloy and an Fe-2 mass%Ni alloy at the same plastic strain amplitude.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation Mechanism of Dislocation Walls during Cyclic Deformation in an Fe–Si Alloy

et al. 2020

View full text Add to dashboard Cite

Low-cycle fatigue tests of a polycrystalline Fe-3 mass%Si alloy were performed at room temperature under a constant total strain amplitude of 1 × 10 − 2. Dislocation structures were observed by high-voltage scanning transmission electron microscopy. The development of dislocation walls parallel to (1 10) started during the first few tens cycles of fatigue. The activation of a set of double slip systems, (211)[1 1 1] and (1 12)[ 11 1], contributed to the formation of (1 10) walls. The (1 10) walls lie in the directions bisecting the angles between the Burgers vectors of the two active dislocations of the double slip systems.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation Mechanism of Dislocation Walls during Cyclic Deformation in an Fe–Si Alloy

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7][8][9][10] Significant attention has been devoted to this area for many years. However, prediction of fatiguelife still remains a challenging research subject.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fatigue Crack Initiation in Thin-walled High Strength Steel as Modeled by Voronoi-polygons

Toyoda¹,

Kimura²,

Kawabata³

et al. 2010

ISIJ Int.

View full text Add to dashboard Cite

Mechanical properties of Fe-rich Si alloy from Hamiltonian

et al. 2017

View full text Add to dashboard Cite

The physical origins of the mechanical properties of Fe-rich Si alloys are investigated by combining electronic structure calculations with statistical mechanics means such as the cluster variation method, molecular dynamics simulation, etc, applied to homogeneous and heterogeneous systems. Firstly, we examined the elastic properties based on electronic structure calculations in a homogeneous system and attributed the physical origin of the loss of ductility with increasing Si content to the combined effects of magneto-volume and D0 3 ordering. As a typical example of a heterogeneity forming a microstructure, we focus on grain boundaries, and segregation behavior of Si atoms is studied through high-precision electronic structure calculations. Two kinds of segregation sites are identified: looser and tighter sites. Depending on the site, different segregation mechanisms are revealed. Finally, the dislocation behavior in the Fe-Si alloy is investigated mainly by molecular dynamics simulations combined with electronic structure calculations. The solid-solution hardening and softening are interpreted in terms of two kinds of energy barriers for kink nucleation and migration on a screw dislocation line. Furthermore, the clue to the peculiar work hardening behavior is discussed based on kinetic Monte Carlo simulations by focusing on the preferential selection of slip planes triggered by kink nucleation.npj Computational Materials (2017) 3:10 ; doi:10.1038/s41524-017-0012-4 INTRODUCTION Mechanical properties of alloys originate from the behavior of electrons and atoms on the microscopic scale; however, the strength of atomic bonding does not directly relate to macroscopic mechanical properties such as the yield strength, fracture toughness, and fatigue resistance. This is because the microstructure on the mesoscale, which is composed of various defects such as impurities, grain boundaries, and dislocations, mediates or enhances the response of alloys against external forces, leading to fairly nonlinear and multiscale phenomena. Facing such a nonlinear nature associated with the strength and plastic deformation of alloys, identifying the controlling factors for the mechanical properties is a significantly difficult task, and clarifying the underlying physics at different length and time scales still remains a major challenge in materials science.The authors of the present article took up the challenge of this complicated problem with their particular theoretical and computational tools unique to each characteristic scale range. These tools are electronic structure calculations, the cluster variation method (CVM) of statistical mechanics, and molecular dynamics (MD) simulations, which may cover the atomic to mesoscopic scale ranges. By virtue of high-performance computers, some of the results obtained by the present calculations achieve a higher precision and reveal a clearer picture than those obtained by ordinary experiments.Among the various mechanical properties, the main focus of the present study is the solid-solut...

show abstract

Evolution of Dislocation Structure and Fatigue Crack Behavior in Fe-Si Alloys during Cyclic Bending Test

Cited by 6 publications

References 18 publications

Formation Mechanism of Dislocation Walls during Cyclic Deformation in an Fe–Si Alloy

Formation Mechanism of Dislocation Walls during Cyclic Deformation in an Fe–Si Alloy

Numerical Simulation of Fatigue Crack Initiation in Thin-walled High Strength Steel as Modeled by Voronoi-polygons

Mechanical properties of Fe-rich Si alloy from Hamiltonian

Contact Info

Product

Resources

About