Boost in mechanical strength of additive manufactured CoCrFeMnNi HEA by reinforcement inclusion of B4C nano-particles

Ahn, Soung Yeoul; Haftlang, Farahnaz; Kim, Eun Seong; Jeong, Sang Guk; Lee, Ji Sun; Kim, Hyoung Seop

doi:10.1016/j.jallcom.2023.170631

Cited by 13 publications

(3 citation statements)

References 57 publications

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“…In 316 L stainless steel, the proportion of small-angle grain boundaries escalated from 3.09% to 65.6%, as depicted in figures 6(a1)-(c1), while in 316LNi stainless steel, the analogous boundaries increased from 0.81% to 70.5%, as displayed in figures 6(d1)-(f1). This augmentation in small-angle grain boundary content within both stainless steels is chiefly attributed to the significant plastic deformation induced by cold rolling, which, in turn, imparts a pronounced dislocation strengthening effect on the material's strength [46][47][48]. Upon incorporation of Nickel (Ni), the grain size of 316 L stainless steel notably expands, concurrently leading to a reduction in the prevalence of large-angle grain boundaries within the field of view.…”

Section: Strengthening Mechanismmentioning

confidence: 99%

Effect of Ni element on microstructure and properties of cold-rolled 316 L austenitic stainless steel

Zhang,

Xiao,

Cai

2024

Mater. Res. Express

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In this current investigation, the impact of Nickel (Ni) on the microstructural attributes and properties of a cold-rolled 316L sheet was examined. The microstructure and phase configuration of austenitic stainless steels, specifically 316L and 316LNi, were meticulously characterized through the utilization of metallography, X-ray Diffraction (XRD), and Electron Backscatter Diffraction (EBSD) techniques. Subsequent assessments were conducted to evaluate magnetic characteristics, microhardness, and tensile properties. The phase structure of both austenitic stainless steels conforms to a Face-Centered Cubic (FCC) crystal lattice, whereby the grain content oriented along the (110) plane progressively escalates with augmenting degrees of cold rolling. The magnetic conductivity of these austenitic stainless steels satisfactorily adheres to established standards. The incorporation of Nickel (Ni) into the alloy composition enhances the cold deformation capacity of 316L stainless steel. However, substantial plastic deformation yields heightened dislocation density, thereby promoting enlarged grain dimensions upon solution treatment. Throughout subsequent cold rolling deformation sequences, the augmented grain size observed in 316LNi stainless steel leads to a reduction in dislocation density within the equivalently ordered cold-rolled plate. Simultaneously, this augmented grain size engenders a decline in grain boundary content coupled with an augmentation in twin content. Consequently, the interplay of grain coarsening, diminished dislocation density, and twin-induced softening collectively bestows upon 316LNi stainless steel a lower tensile strength compared to 316L stainless steel, albeit accompanied by heightened plasticity.

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Section: Strengthening Mechanismmentioning

confidence: 99%

Effect of Ni element on microstructure and properties of cold-rolled 316 L austenitic stainless steel

Zhang,

Xiao,

Cai

2024

Mater. Res. Express

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“…In recent years, high-entropy alloys (HEAs) have attracted widespread attention for subverting the traditional concept of alloy system design [1][2][3][4]. HEAs are composed of five or more principal metallic elements, and each of them has an atomic percentage between 5% and 35% in equal or near-equal molar ratios.…”

Section: Introductionmentioning

confidence: 99%

“…However, the CoCrFeMnNi alloy with a single face-centered cubic (FCC) solid-solution structure exhibits a high density (usually >8 g/cm 3 ) and low strength at room temperature (yield strength, i.e., YS < 400 MPa). Moreover, its mechanical properties decrease significantly at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Microstructure Evolution and Mechanical Properties of Al2O3-Reinforced FCC-CoCrFeMnNi Matrix Composites Fabricated via Gas Atomization and Spark Plasma Sintering

Dai,

Chen,

Luo

et al. 2024

Coatings

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In the present work, novel Al2O3 particles were used to reinforce heterogeneous CoCrFeMnNi high-entropy alloy (HEA) matrix composites with nano- (5.0 wt.%) and nano- + micro- (5.0 wt.% + 10.0 wt.%) specimens. Al2O3 particles were fabricated via gas atomization and spark plasma sintering. The microstructure evolution and properties, i.e., density, hardness, and room temperature compression, were systematically investigated. The results indicate that the concentration of the Cr element in the pure CoCrFeMnNi HEA and the HEA matrix composite can be effectively reduced by using a gas-atomized HEA powder as the matrix. The formation of an impurity phase can also be inhibited, while the distribution uniformity of matrix elements can be improved. The composites prepared via gas-atomized powders formed a network microstructure composed of continuous Al2O3-rich regions and isolated Al2O3-poor regions, exhibiting good plasticity and improved density. The relative densities of the pure HEA, nano- (5.0 wt.%), and nano- + micro- (5.0 wt.% + 10.0 wt.%) composites were 98.9%, 97%, and 94.1%, respectively. The results demonstrate a significant improvement in the relative densities compared to the values (97.2%, 95.7%, and 93.8%) of the composites prepared via mechanical alloying. In addition, compared to the compressive fracture strains of nano- (5.0 wt.%) and nano- + micro- (5.0 wt.% + 10.0 wt.%) composites based on the mechanically alloyed HEA powder, the values of the nano- (5.0 wt.%) and nano- + micro- (5.0 wt.% + 10.0 wt.%) specimens prepared via gas atomization and spark plasma sintering increased by 80% and 67%, respectively.

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Experimentally Validated and Empirically Compared Machine Learning Approach for Predicting Yield Strength of Additively Manufactured Multi-Principal Element Alloys from Co–Cr–Fe–Mn–Ni System

Chandraker,

Barik,

Sai

et al. 2024

Metall Mater Trans A

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Boost in mechanical strength of additive manufactured CoCrFeMnNi HEA by reinforcement inclusion of B4C nano-particles

Cited by 13 publications

References 57 publications

Effect of Ni element on microstructure and properties of cold-rolled 316 L austenitic stainless steel

Effect of Ni element on microstructure and properties of cold-rolled 316 L austenitic stainless steel

Revealing the Microstructure Evolution and Mechanical Properties of Al2O3-Reinforced FCC-CoCrFeMnNi Matrix Composites Fabricated via Gas Atomization and Spark Plasma Sintering

Experimentally Validated and Empirically Compared Machine Learning Approach for Predicting Yield Strength of Additively Manufactured Multi-Principal Element Alloys from Co–Cr–Fe–Mn–Ni System

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