Improvement of strength – ductility balance of B2-strengthened lightweight steel

Hwang, Ji Hyun; Trang, Trần Thị Thu; Lee, O.; Park, Gyeongbae; Zargaran, Alireza; Kim, Nack J.

doi:10.1016/j.actamat.2020.03.022

Cited by 124 publications

(32 citation statements)

References 53 publications

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“…Meanwhile, the separation in the lattice strains increased between different grain families within each phase, which indicated the occurrence of stress partitioning and therefore the plastic deformation progressing not only in the austenite phase but also in the B2 phase. These results, along with the observations on the deformed microstructures of B2 phase in similar alloys [22,23], suggested that the B2 phase in the present alloy was essentially not brittle and was capable for plastic deformation. The elastic stress in each constituent phase, i.e., the so-called phase stress [37,40,41], can be evaluated from the phase strains using Hook's law and Poisson's ratios.…”

Section: Resultssupporting

confidence: 79%

“…Although some very fine B2 particles could be observed in the interior of austenite grains, as was also observed in similar alloys [16], the majority of the B2 particles had coarse sizes. It has been shown that the B2 particles in the alloy were not brittle but plastically deformable [22,23]. Therefore, in the present study, the specimen was considered as a dual-phase alloy having ultrafine-grained microstructures rather than a precipitation strengthened alloy, as was also suggested in Reference [17].…”

Section: Methodsmentioning

confidence: 90%

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Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

et al. 2020

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Intermetallic compounds are usually considered as deleterious phase in alloy designing and processing since their brittleness leads to poor ductility and premature failure during deformation of the alloys. However, several studies recently found that some alloys containing large amounts of NiAl-type intermetallic particles exhibited not only high strength but also good tensile ductility. To clarify the role of the intermetallic particles in the excellent tensile properties of such alloys, the tensile deformation behavior of an ultrafine-grained Fe-Mn-Al-Ni-C alloy containing austenite matrix and B2 intermetallic particles was investigated by using in situ synchrotron radiation X-ray diffraction in the present study. The elastic stress partitioning behavior of two constituent phases during tensile deformation were quantitively measured, and it was suggested that B2 particles played an important role in the high strength and large tensile ductility of the material.

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Section: Resultssupporting

confidence: 79%

Section: Methodsmentioning

confidence: 90%

Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

et al. 2020

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“…The reason for the error of Ti70 alloys at 77 K may be that the existence of the B2 phase affected the slip and interaction of dislocations. At the same time, the strength calculation of B2 require accurate phase volume fraction and size [ 59 ]. It is difficult to quantify the contribution of B2 precipitation strengthening.…”

Section: Resultsmentioning

confidence: 99%

Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures

Lin

Guo

Shi

et al. 2022

Entropy

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Lightweight multiprincipal element alloys (MPEAs) are promising candidates for potential application as engineering materials due to their high strength and low density. In this work, lightweight Ti70Al15V15 and Ti80Al10V10 MPEAs were fabricated via vacuum arc melting. The phases of the Ti70Al15V15 alloys consisted of a BCC phase and a small amount of B2 phase while the Ti80Al10V10 alloys displayed a dual-phase structure with BCC and HCP phases. The different phase compositions led to differences in their mechanical properties. When the temperature changed from 298 K to 77 K, the strength of the alloys further increased and maintained a certain plasticity. This is attributed to the increasing lattice friction stress at cryogenic temperature. TEM observation demonstrated that dislocation played a crucial role in plastic deformation for both the Ti70Al15V15 and Ti80Al10V10 alloys. In addition, Ti80Al10V10 exhibited significant work-hardening capabilities. By analyzing the strengthening mechanism of the alloys, the theoretical yield strength was calculated, and the results agreed with the experimental values. The present results provide new insight into developing lightweight MPEAs containing Ti and Al.

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“…In the past decades, various types of low-density steels (LDSs) have been extensively designed to meet the increasing demands for steel strength, energy saving, and emission reduction that reduces the ecological burden in the automotive industry [1][2][3][4][5]. In the 1980s, Fe-Mn-Al-C LDS was considered as a substitute for austenitic Ni-Cr stainless steel because of its lower price.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances on the Corrosion Resistance of Low-Density Steel: A Review

Liu

Cheng

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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This paper reviews the previous literature on the alloy composition design of low-density steel (LDS), focusing on the effect of Al, Mn, Ni, and other alloy elements on the formation of the steel matrix and second phase, and provides classification. The microstructure of LDS after processing includes the matrix structure, к-carbide, and B2 (FeAl, NiAl, or MnAl) phase of ferritic LDS, austenitic LDS, and dual-phase LDS. The influence of alloy elements on the corrosion resistance of LDS is derived from the addition of Al and Mn for metallurgy. Additionally, the influence of Cr and Mo addition on the corrosion resistance improvement was studied. The electrochemical properties of the corrosion process in LDS are discussed. Further, the microstructure of LDS affects the corrosion resistance properties including pitting corrosion, hydrogen embrittlement, and SCC (stress corrosion cracking). Finally, future research directions are proposed.

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Improvement of strength – ductility balance of B2-strengthened lightweight steel

Cited by 124 publications

References 53 publications

Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

Lightweight Multiprincipal Element Alloys with Excellent Mechanical Properties at Room and Cryogenic Temperatures

Recent Advances on the Corrosion Resistance of Low-Density Steel: A Review

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