Feasibility of using graphene as a substitute to graphite in the laser surface hardening of ferritic stainless steel

Abolhasani, Daniyal; Moon, Byungrok; Kang, Nam Jun; Tyne, C. J. Van; Moon, Young Hoon

doi:10.1016/j.jmrt.2023.02.004

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…The greater trapping of the reinforcement element inside the matrix variants in Cu-Al-Ni-0.9Al2O3 was responsible for its variants' refinement. The lower Marangoni flow caused by the ceramic particles with low thermal conductivity [17,18], in addition to the ceramic's low sensitivity to grain misorientation, reduced the diffusion and aggregation of Al2O3 particles at the grain boundaries [19]. This led to a small variation in the grains, as shown in Figure 5d, but a greater variation in size.…”

Section: Microstructurementioning

confidence: 97%

Enhancing the Mechanical Properties of Cu–Al–Ni Shape Memory Alloys Locally Reinforced by Alumina through the Powder Bed Fusion Process

et al. 2023

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A classical problem with Cu-based shape memory alloys (SMAs) is brittle fracture at triple junctions. This alloy possesses a martensite structure at room temperature and usually comprises elongated variants. Previous studies have shown that introducing reinforcement into the matrix can refine grains and break martensite variants. Grain refinement diminishes brittle fracture at triple junctions, whereas breaking the martensite variants can negatively affect the shape memory effect (SME), owing to martensite stabilization. Furthermore, the additive element may coarsen the grains under certain circumstances if the material has a lower thermal conductivity than the matrix, even when a small amount is distributed in the composite. Powder bed fusion is a favorable approach that allows the creation of intricate structures. In this study, Cu–Al–Ni SMA samples were locally reinforced with alumina (Al2O3), which has excellent biocompatibility and inherent hardness. The reinforcement layer was composed of 0.3 and 0.9 wt% Al2O3 mixed with a Cu–Al–Ni matrix, deposited around the neutral plane within the built parts. Two different thicknesses of the deposited layers were investigated, revealing that the failure mode during compression was strongly influenced by the thickness and reinforcement content. The optimized failure mode led to an increase in fracture strain, and therefore, a better SME of the sample, which was locally reinforced by 0.3 wt% alumina under a thicker reinforcement layer.

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Section: Microstructurementioning

confidence: 97%

Enhancing the Mechanical Properties of Cu–Al–Ni Shape Memory Alloys Locally Reinforced by Alumina through the Powder Bed Fusion Process

et al. 2023

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“…They are cheap and exhibit high formability compared to their austenitic equivalents [2]. FSSs also demonstrate enhanced thermal conductivity, making them appropriate for high-temperature applications [3]. Welded joints of FSS such as AISI 409 and AISI 430 are preferred in automotive industries as they exhibit high resistance to corrosive environments and can withstand mechanical and thermal stresses [4].…”

Section: Introductionmentioning

confidence: 99%

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Nagarajan,

Marimuthu

2023

Mater. Res. Express

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The Mechanical and Stretch-Bend Failure studies on Ultra High Frequency Pulsed Gas Tungsten Arc Welded dissimilar joints of AISI409-AISI430 Ferritic Stainless Steels were conducted. Welding was conducted with 5 ultra high frequencies (50 Hz, 150 Hz, 250 Hz, 350 Hz, 450 Hz). Mechanical characteristics evaluation on the joints included tensile strength, microhardness variations across the welds and creep. Microstructural and metallurgical investigations included weld cross section evaluation, comparing grain variations in high, medium and low thermal heat affected zones, weld zones and base material region. Stretch bend failure studies included studies on angular distortion, fracture limit strain, and coefficient of friction. Tests revealed that joints welded at 350Hz was better, compared to other joints. Dissimilar AISI409-AISI430 joint fabricated at 350Hz exhibited 267 + 3 MPa as yield and 409 + 6 MPa and as ultimate tensile strength. Its creep fracture duration was 72.7 mins (highest among the joints). Microstructural studies revealed grain growth, partially coarse and partially fine grains in heat affected zones. Depending on the difference in grain sizes, on both sides of the welds, heat affected regions were identified as three distinct zones. In AISI430 side; high temperature austenitic, martensitic, delta ferrites and in AISI409 side; needle like martensitic structures, mixture of ferritic-austenitic, δ-ferrite with carbide precipitation were found in high, medium and low thermal heat affected zones, respectively. On increasing the ultra high frequency pulses, angular distortion increased, fractures changed from tensile/shear type to mixed type. In shear bend tests, on increasing the ratio of radius: thickness, fracture limit strain on outer surface, across sheet thickness, due to stretching increased.

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Hardness enhancement by laser modification of titanium under an auxiliary graphite layer

Egorova,

Rozanov,

Sidorova

et al. 2023

Appl. Phys. A

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Feasibility of using graphene as a substitute to graphite in the laser surface hardening of ferritic stainless steel

Cited by 4 publications

References 36 publications

Enhancing the Mechanical Properties of Cu–Al–Ni Shape Memory Alloys Locally Reinforced by Alumina through the Powder Bed Fusion Process

Enhancing the Mechanical Properties of Cu–Al–Ni Shape Memory Alloys Locally Reinforced by Alumina through the Powder Bed Fusion Process

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Hardness enhancement by laser modification of titanium under an auxiliary graphite layer

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