The effect of grain size on the damping capacity of Fe-17 wt%Mn

Shin, Sang‐Wook; Kwon, Minhyuk; Cho, Won-Tae; Suh, In Shik; Cooman, Bruno C. De

doi:10.1016/j.msea.2016.10.079

Cited by 42 publications

(12 citation statements)

References 30 publications

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“…[13] There is an initial increase in e-martensite associated with the cfie Stage I transformation occurring at low strains (£ 4 pct) and once the system is saturated with e-martensite and all of the c-austenite is consumed, Stage II efia, transformation occurs to failure as shown in Figure 9. The strain levels associated with the transition of Stage I to Stage II are consistent with the works described by both Shin et al [52] and Huang et al [53] from their works on ferrous shape memory alloys that contain e-martensite. It was shown that beyond 4 pct strain the deformation was unrecoverable due to the formation of a-martensite from the intersection of e-martensite bands.…”

Section: Discussionsupporting

confidence: 88%

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Field

Aken

2018

Metall Mater Trans A

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Dynamic strain aging (DSA) and rapid work hardening are typical behaviors observed in medium-Mn transformation-induced plasticity (TRIP) steel. Three alloys with manganese ranging from 10.2 to 13.8 wt pct with calculated room temperature stacking fault energies varying from À 2.1 to 0.7 mJ/m 2 were investigated. Significant serrations were observed in the stress-strain behavior for two of the steels and the addition of 4.6 wt pct chromium was effective in significantly reducing the occurrence of DSA. Addition of chromium to the alloy reduced DSA by precipitation of M 23 (C,N) 6 during batch annealing at 873 K (600°C) for 20 hours. Three distinct DSA mechanisms were identified: one related to manganese ordering in stacking faults associated with e-martensite and austenite interface, with activation energies for the onset and termination of DSA being 145 and 277 kJ/mol. A second mechanism was associated with carbon diffusion in c-austenite where Mn-C bonding added to the total binding energy, and activation energies of 88 and 155 kJ/mol were measured for the onset and termination of DSA. A third mechanism was attributed to dislocation pinning and unpinning by nitrogen in a-ferrite with activation energies of 64 and 123 kJ/mol being identified. Tensile behaviors of the three medium manganese steels were studied in both the hot band and batch annealed after cold working conditions. Ultimate tensile strengths ranged from 1310 to 1404 MPa with total elongation of 24.1 to 34.1 pct. X-ray diffraction (XRD) was used to determine the transformation response of the steels using interrupted tensile tests at room temperature. All three of the processed steels showed evidence of two-stage TRIP where c-austenite first transformed to e-martensite, and subsequently transformed to a-martensite.

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Section: Discussionsupporting

confidence: 88%

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Field

Aken

2018

Metall Mater Trans A

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“…This effect is similar to the strength-ductility conflict. , Energy dissipation in metallic materials is mainly achieved through operating the crystal defects, such as dislocations and phase or twin boundaries. − Obviously, defects have the opposite effect on strength and damping capacity. Strengthening mechanisms, such as barriers on dislocations and confinements on GBs, reduce the energy dissipation and lead to size-dependent mechanical properties in polycrystalline materials. − The effect is described by the Hall-Petch relation, − namely, materials become stronger as the grain sizes reduce. On the other hand, evidence in experiments as well as in atomistic simulations shows that the tendency reverses when the size decreases to the order of 10 nm. − In this scale, sliding and migration of GBs and rotation of grains become active and dominant.…”

Section: Introductionmentioning

confidence: 99%

Higher Damping Capacities in Gradient Nanograined Metals

Sheng

Gong

et al. 2022

Nano Lett.

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The capability of damping mechanical energy in polycrystalline metals depends on the activities of defects such as dislocation and grain boundary (GB). However, operating defects has the opposite effect on strength and damping capacity. In the quest for high damping metals, maintaining the level of strength is desirable in practice. In this work, gradient nanograined structure is considered as a candidate for high-damping metals. The atomistic simulations show that the gradient nanograined models exhibit enhanced damping capacities compared with the homogeneous counterparts. The property can be attributed to the long-range order of GB orientations in gradient grains, where shear stresses facilitate GB sliding. Combined with the extraordinary mechanical properties, the gradient structure achieves a strength-ductility-damping synergy. The results provide promising solutions to the conflicts between mechanical properties and damping capacity in polycrystalline metals.

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“…Hereinafter, high-Mn austenitic steel is defined in a broad sense as the steel characterised by a high concentration of Mn, an initially fully austenitic phase state, and low-to-moderate stacking fault energies (SFEs). This category includes traditional Hadfield steels (Hadfield 1888), cryogenic high-Mn steels (Charles et al 1981;Kim et al 2015;Sohn et al 2015), non-magnetic high-Mn steels, TRIP/TWIP steels (Grassel et al 2000;Bouaziz et al 2011;Cooman et al 2018), high damping Fe-Mn alloys (Wang et al 2019;Shin et al 2017;Jee et al 1997), and Fe-Mn-Si-based shape-memory alloys (SMAs) (Sato et al 1982;Otsuka et al 1990). In most cases, steels contain other alloying elements, such as Cr, Ni, Al, Si, C, and N, and the concentration of Mn depends on the alloy system (e.g.…”

Section: Introductionmentioning

confidence: 99%

Designing High-Mn Steels

Sawaguchi

2022

The Plaston Concept

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High-Mn austenitic steels undergo characteristic plasticity mechanisms of the γ-austenite with an FCC structure, such as extended dislocation glide, mechanical twinning, and mechanical martensitic transformation into ε-martensite with an HCP structure and/or α’-martensite with a BCC/BCT structure. Distortions of polyhedron models are used to describe these plasticity mechanisms. These are the smallest volumetric units occupying the lattices and reflect the crystallographic characteristics of the lattices. The complicated crossing shears are correlated to the fine crystal phases formed at the intersection of the ε-martensite variants. The unidirectionality of the {1 1 1} < 1 1 2 > γ twinning shear provides reversibility to the dislocation motion under cyclic loading. Based on this knowledge, the design concept of high-Mn steels is described considering microstructural, thermodynamic, and crystallographic characteristics.

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The effect of grain size on the damping capacity of Fe-17 wt%Mn

Cited by 42 publications

References 30 publications

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Dynamic Strain Aging Phenomena and Tensile Response of Medium-Mn TRIP Steel

Higher Damping Capacities in Gradient Nanograined Metals

Designing High-Mn Steels

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