Ultrafine grained ferrite–martensite dual phase steels fabricated via equal channel angular pressing: Microstructure and tensile properties

Son, Young Il; Lee, Young Kook; Park, Kyung Tae; Lee, Chong Soo; Shin, Dong Hyuk

doi:10.1016/j.actamat.2005.02.015

Cited by 283 publications

(121 citation statements)

References 33 publications

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“…High-strength and high-ductility steels are needed in various industrial sectors such as automobiles, aviation, aerospace, power, transport, and building construction. Such steels have been developed based on several design principles; typical categories include the transformation-induced plasticity (TRIP) steels [8,9], twinning-induced plasticity (TWIP) steels [10,11], dual-phase (DP) steels [12,13], nano-structured steels [14,15], and even hypereutectoid steel wires with ultrahigh (6.35 GPa) tensile strength [16].…”

Section: Introductionmentioning

confidence: 99%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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Keywords:High specific strength steel Dual-phase nanostructure Strain hardening Ductility In situ high-energy X-ray diffraction a b s t r a c tWe report a detailed study of the strain hardening behavior of a Fee16Mne10Ale0.86Ce5Ni (weight percent) high specific strength (i.e. yield strength-to-mass density ratio) steel (HSSS) during uniaxial tensile deformation. The dual-phase (g-austenite and B2 intermetallic compound) HSSS possesses high yield strength of 1.2e1.4 GPa and uniform elongation of 18e34%. The tensile deformation of the HSSS exhibits an initial yield-peak, followed by a transient characterized by an up-turn of the strain hardening rate. Using synchrotron based high-energy in situ X-ray diffraction, the evolution of lattice strains in both the g and B2 phases was monitored, which has disclosed an explicit elasto-plastic transition through load transfer and strain partitioning between the two phases followed by co-deformation. The unloadingreloading tests revealed the Bauschinger effect: during unloading yield in g occurs even when the applied load is still in tension. The extraordinary strain hardening rate can be attributed to the high back stresses that arise from the strain incompatibility caused by the microstructural heterogeneity in the HSSS.

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Section: Introductionmentioning

confidence: 99%

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

et al. 2016

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“…Combining the two great performances, DP steels show great mechanical properties. 3 The intercritical heat treatment, which involves holding in the two-phase (a+g) region, followed by quick cooling, is frequently applied to obtain ferrite and martensite phases in a low-alloy steel. [4][5][6][7][8] Previous investigations suggested that different chemical compositions, thermomechanical processing routes or heat treatments lead to different microstructural configurations, different phase-space distributions and other microstructure characteristics, affecting the deformation and failure behaviors of DP steels.…”

Section: Introductionmentioning

confidence: 99%

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

Zhao¹,

Zhao²,

Sun³

et al. 2017

Mater. Tehnol.

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In this work, the phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications were investigated theoretically and experimentally. In particular, the micromechanical behavior of the steel was modeled, based on the effects of the microstructure, phase fractions, local compositions of single phases and their area shapes. The developed model was used for predicting the damage behavior of a specimen. It was demonstrated that the tensile strength increased with the increasing temperature due to an increase in the amount of martensite in the steel, but the hardening behavior of this specimen was affected by the microstructure. Furthermore, the flow curves of the steel under different intercritical temperatures could be well predicted based on the real microstructures. The subsequent simulation results showed that while higher stress concentrated on the martensite, the shear-band appearance strongly depended on the microstructures of the phases. In addition, for the prediction of damage behaviors, the true stress/true strain curves of macroscale simulations showed good agreement with the experiments involving differently heat-treated steels. Keywords: intercritical treatment, steel, micro model V tem delu so teoreti~no in eksperimentalno preiskovali fazne spremembe in mikromehanske lastnosti dvofaznega jekla po kemijskih prilagoditvah. [e posebej je bilo modelirano mikromehansko obna{anje jekla glede na mikrostrukturo, dele`e posameznih faz, lokalno sestavo posameznih faz in njihovo morfologijo. Razviti model je bil uporabljen za napoved po{kodb vzorca. Dokazano je bilo, da se natezna trdnost pove~uje z nara{~ajo~o temperaturo zaradi nara{~anja vsebnosti martenzita v jeklu, vendar je na kaljivost tega vzorca vplivala mikrostruktura. Nadalje je bilo ugotovljeno, da je mo`no krivulje te~enja jekla pri razli~nih interkriti~nih temperaturah dobro napovedati na podlagi dejanskih mikrostruktur. Nadalje so rezultati simulacij pokazali, da so vi{je napetosti koncentrirane na martenzitu in isto~asna prisotnost stri`nih pasov, mo~no odvisne od mikrostruktur posameznih faz. Poleg tega je za napoved po{kodb pomembno, da se prave krivulje napetost-deformacija, dobljene s pomo~jo simulacij na makronivoju, dobro ujemajo z eksperimentalnimi, dobljenimi pri razli~no toplotno obdelanih jeklih.

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“…The majority of papers on SPD materials have been devoted to the face-centered cubic (FCC) materials such as Al [5], Cu [6] and Ni [7]. For body-centered cubic (BCC) metals, carbon steels have mostly been studied [8][9][10][11][12][13][14][15][16] from a practical view point.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

Rifai¹,

Haga²,

Miyamoto³

et al. 2013

MSA

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Microstructural development of ultra low C, N, Fe-Cr alloy and pure copper processed by equal-channel angular pressing (ECAP) have been examined focusing on the initial stage of the formation of ultrafine grain structure. Fe-Cr alloys were pressed at 423 K while pure copper at room temperature for 1 to 3 passes via the route Bc to compare at the equivalent homologous temperature. Microstructural evolutions were characterized by electron backscatter diffraction (EBSD) image and transmission electron microscopy (TEM). It was found that deformation structures were mostly deformation-induced subboundaries in both the materials after one pass, but the fraction of high-angle grain boundary became higher in the Fe-Cr alloys than in pure copper in subsequent passes by increasing misorientation of the boundaries. The more enhanced formation of high angle boundaries in Fe-Cr alloys was discussed in terms of the nature of crystal slip of FCC and BCC structures.

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Ultrafine grained ferrite–martensite dual phase steels fabricated via equal channel angular pressing: Microstructure and tensile properties

Cited by 283 publications

References 33 publications

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Strain hardening in Fe–16Mn–10Al–0.86C–5Ni high specific strength steel

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

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