Impact of Mn–C couples on fatigue crack growth in austenitic steels: Is the attractive atomic interaction negative or positive?

Habib, Kishan; Koyama, Motomichi; Noguchi, Hiroshi

doi:10.1016/j.ijfatigue.2017.02.009

Cited by 22 publications

(6 citation statements)

References 56 publications

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“…Another factor causing the facets was crack propagation along the slip plane within the grain interior. 18,19) The fractions of the facet fracture surface at ΔK = 18 MPa•m 1/2 for both alloys are presented in Table 2. The fraction of the facet fracture surface exhibited no significant difference between the two alloys (approximately 9%), and the major portion of the fracture surface showed non-facet fracture.…”

Section: Reason For Crack Deflection In Heamentioning

confidence: 99%

Growth Behavior of a Mechanically Long Fatigue Crack in an FeCrNiMnCo High Entropy Alloy: A Comparison with an Austenitic Stainless Steel

et al. 2020

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The fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high-entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with SUS316L. The fatigue crack growth rate of the HEA was lower than that of the SUS316L. The predominant crack growth path was the grain interior for both alloys. A difference was observed in the crack roughness; i.e., the fatigue crack growth path of the HEA was more distinctly deflected than that of the SUS316L. This indicates that roughnessinduced crack closure is a key factor reducing the crack growth rate of the HEA. Another key factor is the noncrystallographic transgranular crack growth mechanism. The SUS316L exhibited crack growth via crack blunting/re-sharpening, while the HEA exhibited transgranular crack growth associated with dislocation substructure alignment.

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Section: Reason For Crack Deflection In Heamentioning

confidence: 99%

Growth Behavior of a Mechanically Long Fatigue Crack in an FeCrNiMnCo High Entropy Alloy: A Comparison with an Austenitic Stainless Steel

et al. 2020

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“…[81][82][83] Therefore, the occurrence of DSA can decelerate fatigue crack growth via the formation of crack roughnessses. 84) In summary, the DSA plays dual roles in the improvement of fatigue crack resistance, i.e., local hardening at the crack tip, and the deflection of crack growth path.…”

Section: Effects On Fatigue Strength: Crack Non-propagation and Crackmentioning

confidence: 99%

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

2018

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This paper presents an overview of the recent works on dynamic strain aging (DSA) of Fe-Mn-C austenitic steels including Hadfield and twinning-induced plasticity (TWIP) steels. First, a model of the DSA mechanism and its controlling factors are briefly explained in terms of Mn-C coupling and dislocation separation. Then, we introduce the effects of DSA on mechanical properties such as work hardening capability, uniform elongation, post-uniform elongation, and fatigue strength. Specifically, we note (1) the pinning effect on extended dislocation for the work hardening, (2) the Poretvin-Le Chatelier banding effect on damage evolution for the tensile elongation, and (3) the crack tip hardening/softening effect on crack resistance for the fatigue strength. We believe that this overview will help in designing advanced highstrength steels with superior ductility and fatigue resistance.

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“…The artificial flaw was introduced using a combination of drilling and focused ion beam milling. Each fatigue test specimen was fixed on a round bar with the jig configured as reported in our previous paper [16]. The fatigue tests were performed in a rotating bending fatigue test machine at room temperature, with a stress ratio of −1 and frequency of 30 Hz.…”

Section: Methodsmentioning

confidence: 99%

Visualization of dislocations through electron channeling contrast imaging at fatigue crack tip, interacting with pre-existing dislocations

Habib

Koyama

Tsuchiyama

et al. 2017

Materials Research Letters

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The dislocation pattern at the tip of a non-propagating fatigue crack in an Fe-25Cr-1N steel (mass%) was characterized by electron channeling contrast imaging. Planar dislocation arrays on two different slip planes were observed at the crack tip. Each planar dislocation array acts as a barrier to the motion of the other planar dislocations on different slip planes, contributing to the enhancement of the resistance to the crack propagation. IMPACT STATEMENT This paper employs 'electron-channeling-contrast-imaging (ECCI) in scanning electron microscope' technique to visualize fatigue crack tip dislocations in high nitrogen steel, and it showed highly planar dislocations interacting with pre-existing dislocations assisting non-propagating fatigue crack.

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Impact of Mn–C couples on fatigue crack growth in austenitic steels: Is the attractive atomic interaction negative or positive?

Cited by 22 publications

References 56 publications

Growth Behavior of a Mechanically Long Fatigue Crack in an FeCrNiMnCo High Entropy Alloy: A Comparison with an Austenitic Stainless Steel

Growth Behavior of a Mechanically Long Fatigue Crack in an FeCrNiMnCo High Entropy Alloy: A Comparison with an Austenitic Stainless Steel

Overview of Dynamic Strain Aging and Associated Phenomena in Fe–Mn–C Austenitic Steels

Visualization of dislocations through electron channeling contrast imaging at fatigue crack tip, interacting with pre-existing dislocations

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