Enhanced Mechanical Properties of a Gradient Nanostructured Medium Manganese Steel and Its Grain Refinement Mechanism

Wang, Lei; Li, Meiyu; Tan, Hao; Feng, Yueming; Xi, Yuntao

doi:10.1007/s11665-020-04903-w

Cited by 9 publications

(1 citation statement)

References 32 publications

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“…[10][11][12][13] This gradient metal is generated from the core to surface with the built-in spatially graded distribution of structural features, such as twin or lamellar thickness, phase fraction, grain size, and chemical components, exhibiting a favorable strength-ductility matching. For instance, Wang et al [14] utilized sliding friction treatment of severe plastic deformation technology to produce gradient microstructure in the medium-Mn steel. The tensile results showed that the YS, ultimate tensile strength (UTS), and total elongation (TE) are 600 MPa, 1158 MPa, and 20% for the gradient sample and 350 MPa, 957 MPa, and 22% for the nongradient sample, respectively.…”

Section: Introductionmentioning

confidence: 99%

Superior Yield Strength and High‐Tensile‐Toughness Matching of Medium‐Mn Steel with Gradient Structure Developed by Cyclic Torsion

Zhang,

Su,

Liu

et al. 2024

steel research int.

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A multiphase‐gradient‐structured medium‐Mn steel with dislocation/stacking fault (SF) density gradient, austenite fraction gradient, and grain size gradient is designed and fabricated by cyclic torsion. It exhibits higher yield strength (YS) (942 MPa), ultimate tensile strength (1295 MPa), and tensile toughness (290 mJ mm−3) than its homogeneous counterpart (672, 1273 MPa, and 278 mJ mm−3, respectively). High‐density‐interlaced SFs are generated at the surface region because of the change in strain path and stress state during cyclic torsion. These massive interactive SFs promote the persistent martensite transformation of the retained austenite in the surface region within the entire uniform strain range. Therefore, in addition to the central layer, the surface region in the gradient structures provides strong strain hardening. Moreover, the continuous martensite transformation in the surface region allows the gradient structure to be retained even after tensile failure, which is beneficial for improving the heterogeneous‐deformation‐induced (HDI) hardening of the gradient‐structured sample during tensile deformation. Thus, the combination of active and persistent transformation‐induced plasticity effect and HDI hardening contributes to its excellent tensile toughness and ductility. Quantitative analysis indicates that HDI strengthening and dislocation strengthening play a dominant role in the sample's ultrahigh YS.

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