A low-alloy high-carbon martensite steel with 2.6 GPa tensile strength and good ductility

Wang, Yingjun; Sun, Junjie; Jiang, Tao; Sun, Yu; Guo, Shengwu; Liu, Yongning

doi:10.1016/j.actamat.2018.07.060

Cited by 163 publications

(43 citation statements)

References 53 publications

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“…In these cases, the refinement of the austenite grain size contributes some improvement of elongation. The similar grain size effect has been already reported by Wang et al 3) with their study on the medium-carbon martensitic steel. The samples austempered at 400°C exhibit the high strength of 1.4 GPa with preferentially large elongations lager than 27%.…”

Section: Tensile Test and Austempering Temperaturesupporting

confidence: 89%

“…Since martensite provides high strength just as heat treated state, it is preferentially adopted in production processing such as hot stamping. 2) Additionally, the recent study 3) clarified that the refinement of prior-austenite grain size of the high carbon martensite steel brings the enhancement of elongation. This report indicates further possibility of the application of martensite.…”

Section: Introductionmentioning

confidence: 99%

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Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

et al. 2021

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Section: Tensile Test and Austempering Temperaturesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

et al. 2021

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“…Light weight, low pollution, and high safety are the main goals for the new generation of cars, which make use of advanced, high-strength steel an inevitable trend [1][2][3][4][5]. Hot-stamped steel, due to its high wear resistance, high hardness, and ultra-high strength, among other qualities, has been widely used in the production of automobile parts [6,7]; for example, in automobile A-B columns, front and rear bumpers, side door anti-collision beams, and so on.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Content and Strain Rate on Hydrogen-induced Delay Cracking for Hot-stamped Steel

Jia¹,

Zhang²,

Xu³

et al. 2019

Metals

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Hot-stamped steel has been widely used in automobile bumper and other safety components due to its high strength. Therefore, this paper investigates the effect of hydrogen content and strain rate on hydrogen-induced delay cracking (HIDC) behavior. The results showed that the plasticity of the steel significantly decreased with an increase in hydrogen content or a decrease in the strain rate. Fractography was analyzed after tensile tests. It was found that all of the pre-charged specimens cracked at large-sized inclusions when stretched at a strain rate of 1 × 10−3 s−1, which indicates that, in this case, the defect itself in the material had great influence on the extend properties. No inclusions were found at the main fracture origin area for hydrogen steady-state specimens, when stretched at a strain rate of 1 × 10−6 s−1, which demonstrated that a slower strain rate causes greater influence by hydrogen. However, for the non-pre-charged samples, the fractures surface showed that cracking originated from the defect near the sample surface, which was independent of strain rates.

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“…TEM observations of the SLM Ag-Cu-Ge alloy after tensile deformation. a-c Bright-field (BF) TEM micrographs showing the interaction of Cu-rich precipitates with dislocations, stacking faults (SFs) and twins[43][44][45][46][47][48][49] . d BF TEM and e dark-field (DF) TEM images showing the interaction of the grain boundaries with dislocations, SFs and twins.…”

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confidence: 99%

Premature failure of an additively manufactured material

et al. 2020

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Additively manufactured metallic materials exhibit excellent mechanical strength. However, they often fail prematurely owing to external defects (pores and unmelted particles) that act as sites for crack initiation. Cracks then propagate through grain boundaries and/or cellular boundaries that contain continuous brittle second phases. In this work, the premature failure mechanisms in selective laser melted (SLM) materials were studied. A submicron structure was introduced in a SLM Ag-Cu-Ge alloy that showed semicoherent precipitates distributed in a discontinuous but periodic fashion along the cellular boundaries. This structure led to a remarkable strength of 410 ± 3 MPa with 16 ± 0.5% uniform elongation, well surpassing the strength-ductility combination of their cast and annealed counterparts. The hierarchical SLM microstructure with a periodic arrangement of precipitates and a high density of internal defects led to a high strain hardening rate and strong strengthening, as evidenced by the fact that the precipitates were twinned and encircled by a high density of internal defects, such as dislocations, stacking faults and twins. However, the samples fractured before necking owing to the crack acceleration along the external defects. This work provides an approach for additively manufacturing materials with an ultrahigh strength combined with a high ductility provided that premature failure is alleviated.

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A low-alloy high-carbon martensite steel with 2.6 GPa tensile strength and good ductility

Cited by 163 publications

References 53 publications

Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Effect of Hydrogen Content and Strain Rate on Hydrogen-induced Delay Cracking for Hot-stamped Steel

Premature failure of an additively manufactured material

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A low-alloy high-carbon martensite steel with 2.6 GPa tensile strength and good ductility

Cited by 163 publications

References 53 publications

Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Bainite Transformation and Resultant Tensile Properties of 0.6%C Low Alloyed Steels with Different Prior Austenite Grain Sizes

Effect of Hydrogen Content and Strain Rate on Hydrogen-induced Delay Cracking for Hot-stamped Steel

Premature failure of an additively manufactured material

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A low-alloy high-carbon martensite steel with 2.6 GPa tensile strength and good ductility