Further investigations on the microstructure and mechanical behaviour of granular bainite in a high strength, low alloy steel: Comparison of ferrite-pearlite and ferrite-martensite microstructures

Samuel, F. H.; Daniel, D. Joseph; Sudre, Olivier

doi:10.1016/0025-5416(87)90155-8

Cited by 11 publications

(11 citation statements)

References 13 publications

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“…ferrite. The present observations are in agreement with the hypothesis of Kang and Kwon [4] that fine distribution of Previous works [7,8] on fractographic observations of DP steels indicate that, during tensile deformation, ferrite martensite enhances toughness of DP steels. When the matrensitic content is increased from ϳ0.6 to ϳ0.78, a sharp deforms first and facilitates the nucleation of cracks either at precipitates present in it or at ferrite-martensite interfaces.…”

Section: Fractographysupporting

confidence: 95%

“…and martensite associated with dynamic recovery. [7] and [8] are referred to as the J-C analysis and modified Specific evidence has not been obtained to support the J-C analysis, respectively. Using both these analyses, Samprevious hypothesis; however, some experimental observauel [40] has been able to reveal the three stages of work hardentions extend support to this view.…”

Section: Fractographymentioning

confidence: 99%

“…(2) Stage II is due to a condition of going through and minimum plastic incompatibility, resulting in lower internal stresses and, thus, enhancing easy flow of ln d d ϭ (1 Ϫ nЈ) ln Ϫ ln (KЉnЉ) [8] dislocations. (3) Stage III consists of simultaneous deformation of ferrite respectively.…”

Section: Fractographymentioning

confidence: 99%

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Influence of martensite content and morphology on tensile and impact properties of high-martensite dual-phase steels

Bag

Ray

Dwarakadasa

1999

Metall Mater Trans A

352

182

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A series of dual-phase (DP) steels containing finely dispersed martensite with different volume fractions of martensite (V m ) were produced by intermediate quenching of a boron-and vanadiumcontaining microalloyed steel. The volume fraction of martensite was varied from 0.3 to 0.8 by changing the intercritical annealing temperature. The tensile and impact properties of these steels were studied and compared to those of step-quenched steels, which showed banded microstructures. The experimental results show that DP steels with finely dispersed microstructures have excellent mechanical properties, including high impact toughness values, with an optimum in properties obtained at ϳ0.55 V m . A further increase in V m was found to decrease the yield and tensile strengths as well as the impact properties. It was shown that models developed on the basis of a rule of mixtures are inadequate in capturing the tensile properties of DP steels with V m Ͼ 0.55. Jaoul-Crussard analyses of the work-hardening behavior of the high-martensite volume fraction DP steels show three distinct stages of plastic deformation.

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Section: Fractographysupporting

confidence: 95%

Section: Fractographymentioning

confidence: 99%

See 1 more Smart Citation

Influence of martensite content and morphology on tensile and impact properties of high-martensite dual-phase steels

Bag

Ray

Dwarakadasa

1999

Metall Mater Trans A

352

182

View full text Add to dashboard Cite

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“…The three stages observed may be due to different work-hardening mechanisms associated with the finer distribution of constituent phases [18]. Several previous investigators [18,31,33,36] have been able to reveal the three stages of work hardening in DP steels using D C−J analyses, which can be attributed to the following deformation mechanisms.…”

Section: Strain-hardening Behaviormentioning

confidence: 92%

Influence of silicon on the microstructures, mechanical properties and stretch-flangeability of dual phase steels

Zhou

Zhang

Liu

2014

Int J Miner Metall Mater

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Uniaxial tension tests and hole-expansion tests were carried out to determine the influence of silicon on the microstructures, mechanical properties, and stretch-flangeability of conventional dual-phase steels. Compared to 0.03wt% silicon, the addition of 1.08wt% silicon induced the formation of finer ferrite grains (6.8 μm) and a higher carbon content of martensite (C m ≈ 0.32wt%). As the silicon level increased, the initial strain-hardening rate (n value) and the uniform elongation increased, whereas the yield strength, yield ratio, and stretch-flangeability decreased. The microstructures were observed after hole-expansion tests. The results showed that low carbon content martensite (C m ≈ 0.19wt%) can easily deform in coordination with ferrite. The relationship between the mechanical properties and stretch-flangeability indicated that the steel with large post-uniform elongation has good stretch-flangeability due to a closer plastic incompatibility of the ferrite and martensite phases, which can effectively delay the production and decohesion of microvoids.

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“…There is no doubt that the main contribution to the strength comes from the high fraction of slender bainitic ferrite plates 12,18,59,60 in the form of the Langford and Cohen relationship (t a ) À1 . 59,61 There is also the contribution of the dislocation density and that of the Cottrell atmospheres, 59,62,63 as well as an important strengthening due to the solid solution of C in both ferrite and austenite. 64 The fact that nanostructured bainitic ferrite is tetragonal 30,38,52,65,66 allows it to accommodate a bigger amount of C in solid solution, 0.18 wt.%, when compared with the cubic structure.…”

Section: Nanostructure In Low-temperature Bainitic Steelmentioning

confidence: 98%

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

Morales-Rivas

Yen

Huang

et al. 2015

JOM

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The present work is concerned with the study of the relationship between microstructure and ductility of nanostructured bainite. The tensile behavior of two steels treated at the same temperature during different times has been analyzed. Special attention has been paid to the role that the retained austenite mechanical stability plays in enhancing the ductility through its contribution to the work-hardening and the damage resistance of these materials. The results have shown that the relative mechanical properties of the phases present affect both the martensitic transformation behavior and the total elongation.

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Further investigations on the microstructure and mechanical behaviour of granular bainite in a high strength, low alloy steel: Comparison of ferrite-pearlite and ferrite-martensite microstructures

Cited by 11 publications

References 13 publications

Influence of martensite content and morphology on tensile and impact properties of high-martensite dual-phase steels

Influence of martensite content and morphology on tensile and impact properties of high-martensite dual-phase steels

Influence of silicon on the microstructures, mechanical properties and stretch-flangeability of dual phase steels

Tensile Response of Two Nanoscale Bainite Composite-Like Structures

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