High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

Tsuchida, Noriyuki; Tomota, Yō; Nagai, Kotobu

doi:10.2355/isijinternational.42.1594

Cited by 25 publications

(22 citation statements)

References 5 publications

(9 reference statements)

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“…3 show the changes in the strain rate calculated by using Eq. (6). The calculated strain rates show good agreement with the measured ones.…”

Section: Computation Procedures For Flow Stress During Creepsupporting

confidence: 69%

“…5,6) We conducted tensile tests with strain rates from 10 Ϫ9 to 10 Ϫ2 s Ϫ1 at temperatures between 77 and 296 K. For the alpha Ti alloy 2) and the austenitic 25Cr-19Ni steel, 4) the s-e relations at very low strain rates were obtained by a crosshead-arresting test in which the changes in load and displacement were recorded after the crosshead was arrested at several displacements. After a sufficiently long time, the changes either in load or in displacement became non-detectable.…”

Section: Introductionmentioning

confidence: 99%

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True Stress-True Strain Relations with Very Low Strain Rates at Room Temperature for an Austenitic 25Cr-19Ni Steel

et al. 2004

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True stress (s)-true strain (e) relations at very low strain rates at room temperature are compared in creep and tensile tests to investigate the effect of deformation history on the s-e relation and the applicability of the Kocks-Mecking (KM) model for the austenitic 25Cr-19Ni steel. Experimental results obtained by the creep and the tensile tests indicate that the s-e relation is not influenced by prior deformation history at true strains below 0.2. The s-e curves at very low strain rates between 10 Ϫ8 and 10 Ϫ10 s Ϫ1 obtained by the creep test are in accordance with those calculated by the KM model as well as that measured by the crosshead-arresting test. The KM model is concluded to be applicable to the s-e relations at very low strain rates obtained by various deformations.

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“…3 show the changes in the strain rate calculated by using Eq. (6). The calculated strain rates show good agreement with the measured ones.…”

Section: Computation Procedures For Flow Stress During Creepsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

True Stress-True Strain Relations with Very Low Strain Rates at Room Temperature for an Austenitic 25Cr-19Ni Steel

et al. 2004

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“…According to N. Tsuchida et al, 18) the thermal component of flow stress is independent of ferrite grain size while the athermal component increases with decreasing grain size. Therefore, in Fig.…”

Section: Estimation Of Fracture Stressmentioning

confidence: 99%

Ductile-Brittle Transition Temperature of Ultrafine Ferrite/Cementite Microstructure in a Low Carbon Steel Controlled by Effective Grain Size

2004

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To analyze the good toughness of ultrafine ferrite/cementite steels, the concept of effective grain size (d EFF ) is applied to ductile-to-brittle transition temperature, DBTT, for ultrafine ferrite/cementite (Uf-F/C), ferrite/pearlite (F/P), quenched (Q), and quench-and-tempered (QT) microstructures in a low carbon steel. The d EFF is determined to be 8, 20, 100, and 25 mm for Uf-F/C, F/P, Q, and QT, respectively. In F/P and Q, it is in accordance with the ferrite grain size and the prior austenite grain size, respectively. In QT, the d EFF fits the martensite packet size. In Uf-F/C, the ferrite grain size has a bimodal distribution and the larger grain size corresponds to the d EFF , which is the smallest among the four microstructures. In terms of the relationship between d EFF and DBTT, the Uf-F/C, Q, and QT microstructures can be placed into the same group and the F/P to a different one. Furthermore, the Uf-F/C has the highest estimated fracture stress among the four microstructures. These might be the result of the difference in the surface energy of fracture, namely the former is estimated to have a surface energy of 34.6 J/m 2 and latter a surface energy of 7.7 J/m 2 . Thus, the excellent toughness of the ultrafine ferrite/cementite steel can be attributed to the small d EFF and the high surface energy of fracture.KEY WORDS: effective grain size; ductile-to-brittle transition temperature; toughness; fracture strength; low carbon steel; ultrafine grain structure. Fig. 1. Relationship between the change in DBTT and the change of 9.8 MPa in yield strength for different microstructural factors, i.e. dislocation strengthening, dispersion strengthening, and grain-size strengthening.

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“…Table 1, (b) the values of f q and K were listed in Table 1 and the value of d was assumed to be 100 nm. ( 4 ) eϭln(1ϩe) ииииииииииииииииииииииииииииииииииииииииииииииииииииииии ( 5 ) s -e Hollomon sϭAe n иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ( 6 ) A n ( 4 )ϳ ( 6 ) e s sϭAe n ϭs(1ϩe)ϭs exp e иииииииииииииииииииииииииииииииииииииии ( 7 ) ииииииииииииииииииииииииииииииииииииииииииииииииииииии( 8 ) steels with various grain sizes, 20) (c) ferrite and pearlite single microstructure steels and ferrite-pearlite (FP) steels, 22,23) and (d) FP and tempered martensite (QT) steels. 16) Fig.…”

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“…Calculated work-hardening rate at s pdl as a function of yield strength in various single and multi microstructure steels. 16,[20][21][22][23] …”

mentioning

confidence: 99%

Effect of Cementite Volume Fraction on Static Tensile Properties in Ultrafine-grained Ferrite–Cementite Steels

Tsuchida¹,

Torizuka²,

Nagai³

et al. 2010

Tetsu-to-Hagane

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High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

Abstract: Note Fig. 1. Optical micrographs of ferrite-pearlite steels with ferrite grain sizes of 3.6 mm (a), 9.8 mm (b) and 46.2 mm (c).

Cited by 25 publications

References 5 publications

True Stress-True Strain Relations with Very Low Strain Rates at Room Temperature for an Austenitic 25Cr-19Ni Steel

True Stress-True Strain Relations with Very Low Strain Rates at Room Temperature for an Austenitic 25Cr-19Ni Steel

Ductile-Brittle Transition Temperature of Ultrafine Ferrite/Cementite Microstructure in a Low Carbon Steel Controlled by Effective Grain Size

Effect of Cementite Volume Fraction on Static Tensile Properties in Ultrafine-grained Ferrite–Cementite Steels

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