Rapid cooling by laser melt quenching

Elliott, William Allan; Gagliano, F. P.; Krauß, G.

doi:10.1063/1.1654202

Cited by 36 publications

(8 citation statements)

References 5 publications

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“…For example, shock-hardening of an aluminum alloy by a pulse laser was found to improve the fatigue strength as a result of compressive residual stresses build-up (Hsu, 1973), and laser-aided hardening of steel was found to be due to the formation of martensite with embedded graphite particles (Walther and Pera, 1978). Moreover, rapid quenching of laser melted aluminum and Ag-Cu alloys resulted, respectively, in a fine dendritic microstructure and a single-phase solid solution (Elliott et al, 1972). Laser melting was reported to be an effective means of reducing the microporosity and surface roughness of plasma-sprayed coatings (Walther and Pera, 1978;Pangborn and Beaman, 1980).…”

Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Laser-Cladded Coating Materials

Komvopoulos

Nagarathnam

1990

Journal of Engineering Materials and Technology

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The feasibility of laser cladding as a surface modification process was experimentally investigated. Emphasis was placed on identification of the effects of independent critical process parameters such as laser power, process speed (interaction time), and feed rate of cladding powder mixture on the microstructure, compositional homogeneity, geometry (e.g., thickness and width), and mechanical properties of the developed coatings. Rapidly solidified coatings metallurgically bonded to AISI 1018 steel substrates were formed in situ by using a 10 kW continuous wave C0 2 laser to melt a thin layer of the substrate as well as a powder mixture consisting of Fe, Cr, C, and W with a weight ratio of 10:5:1:1 delivered to the substrate by means of blown shielding gas and a pneumatic screw feed system. Various diagnostic methods, indentation hardness measurements, and scratch-resistance testing of the laser-cladded coating materials revealed a high degree of grain refinement, increased solid solubility and uniform distribution of alloying elements, high hardness, and appreciable resistance against plastic shear deformation when the important process parameters were optimized. Microstructure studies demonstrated that coatings with very fine or relatively coarse dendritic, feathery, and particulate type microstructures were obtained, depending on the processing conditions. This investigation verified that due to the inherent rapid solidification and high concentration of key elements in the surface, hard coating materials of novel microstructures and physical properties which can be tailored to the surface requirements of the application can be produced with minimum dilution and thermal distortion. Implications of the laser cladding process in tribological applications are also interpreted qualitatively in light of the obtained results.

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Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Laser-Cladded Coating Materials

Komvopoulos

Nagarathnam

1990

Journal of Engineering Materials and Technology

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“…Nonequilibrium structures with better wear resistance and thermal stability may be formed in steel (by precipitation of austenite and bainite) and aluminium alloys on rapid solidification by laser melt quenching (75,76).…”

Section: Surface Texturingmentioning

confidence: 99%

Laser Processing of Metallic and Intermetallic Surfaces

Petit¹

1993

Materials and Manufacturing Processes

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The most common applications 01 the laser processing 01 metallic and intermetallic surfaces are presented. The advantages 01 this technology are deduced Irom the basic principles 01the interaction 01laser light w"h metallic materials. Applicetions, like superficial hardening and surface cleaning and alloying, are extensions 01 exi:rting processes beneming by the specific advantages 01laser annealing. Other ones, like de,position 01 passivating or wear·resistant coatings, exploit photochemical reactions induced in gas-phase or at metallic and semiconducting surfaces by UV or high intens"y laser beams.

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“…Laser surface melting (LSM)/quenching is a relatively new and active research area [1][2][3][4][5][6][7][8][9] in the field of material processing with directed energy sources. Focussed laser energy is used to melt a thin layer with the bulk providing selfquenching.…”

Section: Introductionmentioning

confidence: 99%

The use of laser surface melting to homogenize Fe-Al bronzes

Draper¹

1981

J Mater Sci

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Laser surface melting has been used to homogenize the near-surface region of several Fe-AI bronzes. A continuous CO2 laser beam was focussed onto the sample surface while the samples moved at high velocities in order to produce melt stripes. The quenched regions were approximately 10/lm deep. In the case of the aluminum bronzes C-61 400 and C-62 400 iron-rich precipitates have been eliminated from the surface region. For C62 400 the pre-irradiation matrix is ~ -I-3'2, following laser processing, a single phase, presumably metastable/3, is formed in the quenched region. The aluminium bronze C-62 500 is not homogenized to the same degree as the C-61 400 or C-62 400. Sample analysis was carried out utilizing optical microscopy, scanning electron microscopy, energy dispersive X-ray analysis and scanning Auger microscopy.

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Rapid cooling by laser melt quenching

Cited by 36 publications

References 5 publications

Processing and Characterization of Laser-Cladded Coating Materials

Processing and Characterization of Laser-Cladded Coating Materials

Laser Processing of Metallic and Intermetallic Surfaces

The use of laser surface melting to homogenize Fe-Al bronzes

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