Heterostructured alloys with enhanced strength-ductility synergy through laser-cladding

Kim, Rae Eon; Kim, Eun Seong; Karthik, G.M.; Gu, Gang Hee; Ahn, Soung Yeoul; Park, Hyojin; Moon, Jongun; Kim, Hyoung Seop

doi:10.1016/j.scriptamat.2022.114732

Cited by 40 publications

(3 citation statements)

References 57 publications

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“…In addition, the elastic-plastic interface with a larger strength differential on both sides will generate a higher strain gradient, which needs to be accumulated by more GNDs, causing a higher increment of the GND density in the 1000-4 sample compared to the 1050-5 sample at the same strain. Accompanied by the accumulation of the GNDs, forward stress in the relatively harder layer and back stress in the relatively softer layer are produced accordingly [17,23], which collectively generate HDI strengthening and hardening [24], leading to the good strength-ductility combination for the inverse gradient-grained CoCrFeMnNi HEA [25]. To quantitively investigate the evolution of HDI strengthening and hardening during deformation, the true stress-strain curves under the loading-unloading-reloading tensile tests of the experimental CoCrFeMnNi HEAs with inverse gradient-grained structures are presented in Figure 7a.…”

Section: Microstructural Evolution During Tensile Deformationmentioning

confidence: 99%

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Chen,

Hu,

Wang

et al. 2024

Materials

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The microstructures and mechanical properties of equiatomic CoCrFeMnNi high-entropy alloys (HEAs) treated with various processing parameters of laser surface heat treatment are studied in this paper. The typical inverse gradient-grained structure, which is composed of a hard central layer and a soft surface layer, can be obtained by laser surface heat treatment. A much narrower gradient layer leads to the highest yield strength by sacrificing ductility when the surface temperature of the laser-irradiated region remains at ~850 °C, whereas the fully recrystallized microstructure, which exists from the top surface layer to the ~1.05 mm depth layer, increases the ductility but decreases the yield strength as the maximum heating temperature rises to ~1050 °C. Significantly, the superior strength–ductility combination can be acquired by controlling the surface temperature of a laser-irradiated surface at ~1000 °C with a scanning speed of ~4 mm/s due to the effect of hetero-deformation-induced strengthening and hardening, as well as the enhanced interaction between dislocation and nanotwins by the hierarchical nanotwins. Therefore, retaining the partial recrystallized microstructure with a relatively high microhardness in the central layer, promoting the generation of hierarchical nanotwins, and increasing the volume proportion of gradient layer can effectively facilitate the inverse gradient-grained CoCrFeMnNi HEAs to exhibit a desirable strength–ductility synergy.

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Section: Microstructural Evolution During Tensile Deformationmentioning

confidence: 99%

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Chen,

Hu,

Wang

et al. 2024

Materials

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“…In addition, the tensile strength of this alloy component was increased by up to 46% compared to the fabrication of a single mental material. Kim et al [11] reported that a simple process to develop heterogeneous layered alloys by wrought and laser-cladding. They indicated that the heterogeneous structure improved the yield strength and tensile strength by contributing to the strong accumulation of GNDs at the regional interface during plastic deformation compared with conventional deformation and monolithic laser cladding alloys.…”

Section: Region Peak Current (A)mentioning

confidence: 99%

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Jiang

Nie

Teng

et al. 2023

Materials Characterization

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“…In order to avoid serious accidents, some surface modification technologies are used to improve the properties of 45 steel parts. Of these, laser cladding is a new technology to enhance the service life of parts and equipment and is widely used in production [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ceramic Particles on Ni-Based Alloy Coating Fabricated via Laser Technology

Zhang,

Wang,

Wang

et al. 2023

Lubricants

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Laser cladding is a new technology for fabricating coatings with good properties, such as wear resistance, lubrication, and corrosion resistance. Usually, parts of 45 steel are used as a shaft under conditions of high-speed rotation or friction and wear, and they have a short service life and sometimes cause accidents. In order to avoid serious accidents, a cladding coating made from a Ni-based alloy with ceramic particles was fabricated via laser technology on a substrate of 45 steel in this research. The microstructure and properties were investigated via SEM, EDS, XRD, and a wear and friction tester. The results show that there was an obvious boundary between the cladding coating and the substrate. The main phases were γ(Fe, Ni), WC, TiC, Cr2Ti, and Cr23C6. In the middle of cladding coating, the microstructure was composed of dendrite and cellular crystals, while the microstructure was composed of equiaxial crystals in the bonding region. Inside the cellular crystal, the main phase was γ~(Fe, Ni), which occasionally also showed the appearance of some white particles inside the cellular crystal. Compared with the cellular crystal, the boundary had less of the Fe and Ni elements and more of the Cr and W elements. The amount of C element around the dendrite crystal was more than that around the boundary of cellular crystal due to the long formation time of dendrite. The white particles around the boundary were carbides, such as WC and Cr23C6 phases. Meanwhile, the segregation of the Si element also appeared around the boundaries of the crystal. The maximum microhardness was 772.4 HV0.5, which was about 3.9 times as much as the substrate’s microhardness. The friction coefficients of the 45 steel substrate and Ni-based alloy coating were usually around 0.3 and 0.1, respectively. The Ni-based coating had a smaller coefficient and more stable fluctuations. The wear volume of the cladding coating (0.16 mm3) was less than that of the substrate (1.1 mm3), which was about 14.5% of the wear volume of 45 steel substrate. The main reason was the existence of reinforced phases, such as γ~(Fe, Ni), Cr23C6, and Cr2Ti. The added small WC and TiC particles also enhanced the wear resistance further. The main wear mechanism of the cladding coating was changed to be adhesive wear due to the ceramic particles, which was helpful in improving the service life of 45 steel.

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Heterostructured alloys with enhanced strength-ductility synergy through laser-cladding

Cited by 40 publications

References 57 publications

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Multi-wire arc additive manufacturing of TC4-Nb-NiTi bionic layered heterogeneous alloy: Microstructure evolution and mechanical properties

Effect of Ceramic Particles on Ni-Based Alloy Coating Fabricated via Laser Technology

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