Stabilized uniform deformation in a high-strength ferrite-cementite steel with multiscale lamellar structure

Ning, Jiangli; Zhang, Yatong; Huang, Lu; Feng, Yunli

doi:10.1016/j.matdes.2017.02.031

Cited by 20 publications

(5 citation statements)

References 63 publications

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“…The lamellar coarsening process is influenced by the lamellar shrinkage and termination ACCEPTED MANUSCRIPT 3 annihilation as well as by the merging of lamellae [14,15]. The lamellar structure is also of interest in other class of materials in engineering and biomedical applications [16][17][18]. In order to gain fundamental understanding of the role of alloying elements in modifying the structural, electronic and mechanical properties of TiAl, specific knowledge of the lattice site occupancy behaviour is crucial.…”

Section: Introductionmentioning

confidence: 99%

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Mathabathe

Bolokang

Govender

et al. 2018

Journal of Alloys and Compounds

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Structure-property orientation relationship of a γ/α 2 /Ti 5 Si 3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy, Journal of Alloys and Compounds (2018), Abstract Structure-property relationship of the as-cast γ-Ti-45Al-2Nb-0.7Cr-0.3Si based intermetallic alloy was examined. The phases stable at room temperature in the alloy were γ/α 2 /Ti 5 Si 3 , respectively; while their crystal structures were described by means of chemical formulas, Pearson's number, space groups, lattice parameters, atomic positions and occupancy numbers using a Vienna ab initio simulation package (VASP) software for materials design. Moreover, high resolution electron backscatter diffraction (HSEBSD) was used to analyse the orientation relationship of both the ascast (β-solidifying) and heat-treated (α-solidifying) microstructural phases. The results showed that the formation of γ/α 2 /Ti 5 Si 3 follows the Blackburn orientation relationship (BOR): (β-solidifying) {110} β // {0001} α and <111> β // <2110> α , and for (α-solidifying) = (111)γ || (0001)α and <110]γ || <1120>α.

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Section: Introductionmentioning

confidence: 99%

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Mathabathe

Bolokang

Govender

et al. 2018

Journal of Alloys and Compounds

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“…Another reason may be due to the composition of phases as the samples deformed in the two-phase region followed by water quenching. The UTS of all the cooling modes is more than the already reported [18,24]. It may be caused by the difference in the size of ferrite grain and carbide particles.…”

Section: Resultsmentioning

confidence: 62%

“…It deteriorates the plastic deformation and reduces the accumulative space of dislocation. During tensile test, the crack emerges, once the dislocation density reaches a critical value [24].…”

Section: Discussionmentioning

confidence: 99%

Effect of cooling mode on the microstructure and mechanical properties of medium carbon steel after warm rolling

Fan

Chen

et al. 2019

Ironmaking & Steelmaking

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The effects of cooling modes (air, furnace and water) on the variation of microstructure and mechanical properties of medium carbon steel were investigated. SEM, TEM and EBSD techniques were used to observe the microstructure. The observed results show that the effect of cooling mode on the grain size is insignificant. The average sizes of ferrite grain obtained under different cooling modes were little different. Moreover, in all the cases, most of the cementite lamellas were transformed into cementite particles, except for some of the residual cementite lamellas which were present on the original pearlite colonies. It has also been found that the ferrite substructure and precipitation of cementite particles are significantly affected by the cooling modes. Compared to other cooling modes, the furnace cooling is beneficial to the homogeneity of microstructure. The particles are distributed on the ferrite matrix more homogeneously after furnace cooling which results in a better combination of strength and ductility.

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“…The as-received material shows a homogeneous distribution of ferritic-pearlitic grains, Figure 5a, which has been shown numerously in the literature. [53] The microstructure of the blank quenched in the cooled tool section, Figure 5b, consists of a fully martensitic structure. This is a clear evidence for the high cooling rate imposed by the forming step.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…This is a clear evidence for the high cooling rate imposed by the forming step. [53] In case of SEM analysis of the transition zone of the differentially cooled, microstructurally graded blank, a complex microstructure consisting of ferritepearlite and martensite as well as bainite can be observed (Figure 5c). However, here it has to be noted that the locally prevailing fractions of these phases may differ.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

Scharifi

Schade

Ademaj³

et al. 2021

steel research int.

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The ongoing global trend toward carbon dioxide emission reduction forced the automotive industry to design lighter and resource-efficient vehicle bodies, leading to the huge success of the press hardening process. [1][2][3][4][5] One reason for this success lies in the availability of thin-walled ultrahigh strength steel 22MnB5, which combines good formability and highest strength properties of 1500 MPa at a fully martensitic structure after press hardening at reasonable costs. [6,7] Since the first application in the automotive industry in 1986 as a side-impact beam, [8] the application field of 22MnB5 components increases continuously from B-pillar to roof rail reinforcement and other parts to enhance passenger safety. [9,10] The thermomechanical approach of press hardening allows the production of complex-shaped components with high dimensional accuracy, [11] excellent mechanical properties, and, at the same time, offers the opportunity for realizing tailored properties. [12,13] Although a time-temperature course of uniform austenitization and quenching in a cooled forming tool, Figure 1a, results in a homogenous fully martensitic structure with highest strength, a locally varying time-temperature course during the forming process, Figure 1b, enables the creation of a tailored distribution of microstructures, where mechanical properties are locally adjusted to perfectly meet the load profile, e.g., in case of crash-relevant components. [5,6] According to Ademaj et al., after uniform austenitization at 930 C but differential cooling of 22MnB5, zones following "route H" develop highest tensile strengths (1500 MPa) whereas zones following "route S" show lower tensile strength properties (614 MPa). [14] Both process strategies of Figure 1 are chosen for the current study with respect to the aforementioned investigations.This approach has been identified as a viable option to obtain lighter body structures through the ability to design load adapted structures and to combine contradictory requirements within one component. [14,15] A prominent example in car body structures is the B-pillar, in which the bottom section exhibits higher

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Stabilized uniform deformation in a high-strength ferrite-cementite steel with multiscale lamellar structure

Cited by 20 publications

References 63 publications

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Structure-property orientation relationship of a γ/α2/Ti5Si3 in as-cast Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy

Effect of cooling mode on the microstructure and mechanical properties of medium carbon steel after warm rolling

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

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