Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite

Liu, H.; Shang, X. K.; He, Binbin; Liang, Z.Y.

doi:10.1016/j.ijplas.2022.103495

Cited by 25 publications

(3 citation statements)

References 63 publications

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“…Strain‐hardening curves together with true stress–strain curves of two DED stainless steels are shown in Figure 7b. The strain‐hardening curve of two stainless steels exhibited a typical parabolic shape, [ 44,45 ] which gradually decreased until it intersected with true strain–stress curve. Based on Considére criterion [ 46–48 ]

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Section: Resultsmentioning

confidence: 99%

Simultaneously Improving the Strength and Plasticity of Additively Manufactured 316L Stainless Steel by Adding Aluminum

Tian,

Li,

et al. 2024

Adv Eng Mater

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Due to the special layer‐by‐layer printing process of additive manufacturing (AM), the heat dissipation in the printed material tends to flow mainly along the building direction, which results in the formation of coarse columnar grains in AM metals. The coarse grains is detrimental to the mechanical properties of AM metals, and is not conducive to the lightweight development of AM metal components. This article proposed a printing strategy for adding aluminum to 316L stainless steel. Based on the aluminum reinforced strategy, low melting point MnSiO3 particles were transformed into high melting point Al‐containing particles (such as Al2O3), and the grain size of 316L stainless steel produced by direct energy deposition (DED) was refined, resulting in a significant improvement of tensile strength. What’s more, the increase in tensile strength of Al‐reinforced 316L did not sacrifice its plasticity. Attributed to the twinning‐induced plasticity (TWIP) effect and good adhesion between Al2O3 particles and matrix, the plasticity of Al‐reinforced 316L was synchronously improved. To be more specific, compared to DED‐316L without adding Al, the yield strength and tensile strength of samples with adding 0.5%wt Al were individually improved by 14.8% and 16.2%, at same time, the uniform elongation and total elongation were increased by 80.4% and 13%, respectively. The printing strategy proposed in this article is expected to provide reference for the strengthening and toughening of AM metals, thereby contributing to the lightweight development of AM components.This article is protected by copyright. All rights reserved.

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$$\left(\right.

…”

Section: Resultsmentioning

confidence: 99%

Simultaneously Improving the Strength and Plasticity of Additively Manufactured 316L Stainless Steel by Adding Aluminum

Tian,

Li,

et al. 2024

Adv Eng Mater

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“…Additionally, the YS of the martensite steel may be approximately rationalized by the strength increments caused by solid solution, lattice friction, boundaries, dislocations, and precipitation. [ 34,35 ] The flow strength of the present steel can be calculated by adding individual strengthening. [ 33 ]

{\sigma }_{y}={\sigma }_{0}\text{&amp;#x00026;amp;amp;amp;plus;}{\sigma }_{\text{g}}\text{&amp;#x00026;amp;amp;amp;plus;}{\sigma }_{\text{d}&amp;#x00026;amp;amp;amp;nbsp;}\text{&amp;#x00026;amp;amp;amp;plus;}{\sigma }_{\text{s}&amp;#x00026;amp;amp;amp;nbsp;}\text{&amp;#x00026;amp;amp;amp;plus;}{\sigma }_{\text{p}}

where σ 0 is the lattice friction stress (54 MPa), σ g , σ d , σ s , and σ p are the strengthening contributions caused by grain boundary, dislocation, solid solution, and precipitation, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the YS of the martensite steel may be approximately rationalized by the strength increments caused by solid solution, lattice friction, boundaries, dislocations, and precipitation. [34,35] The flow strength of the present steel can be calculated by adding individual strengthening. [33]…”

Section: The Strengthening Mechanismmentioning

confidence: 99%

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

Chen,

Zhang,

Tian

et al. 2024

steel research int.

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A 2460 MPa ultimate tensile strength (UTS) has been achieved in this experimental steel, which was processed by a conventional hot stamping process with water quenching to room temperature. Additionally, comparing the microstructure evolution and strengthening mechanism before and after tempering, the microstructure has changed from fresh martensite transformed into tempered martensite with acicular carbides, and the fracture mode has also changed from brittle fracture transformed into ductile fracture mainly. Meanwhile, the main strengthening mechanism has changed from dislocation strengthening to precipitation and dislocation strengthening. Overall, the tempering process reduces dislocation density and produces acicular carbides, which decrease UTS. However, the tempering process reduces the quenching residual stress and changes the morphology of twin martensite, resulting in an increase in ductility. Meanwhile, it enhances the effect of carbide pinning dislocations, significantly enhances precipitation strengthening, and improves yield strength.

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Surface-Dependent Mechanical Behavior of Ultra-Thin 304L Stainless Steel

Liu,

Liang,

et al. 2023

Metall Mater Trans A

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Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite

Cited by 25 publications

References 63 publications

Simultaneously Improving the Strength and Plasticity of Additively Manufactured 316L Stainless Steel by Adding Aluminum

Simultaneously Improving the Strength and Plasticity of Additively Manufactured 316L Stainless Steel by Adding Aluminum

Enhanced Yield Strength and Total Elongation of an Ultrahigh Strength Hot‐Stamped Steel via Tempering Treatment

Surface-Dependent Mechanical Behavior of Ultra-Thin 304L Stainless Steel

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