Laser surface engineering of a magnesium alloy with Al+Al2O3

Majumdar, Jyotsna Dutta; Chandra, B. Ramesh; Mordike, B. L.; Galun, R.; Manna, I.

doi:10.1016/s0257-8972(03)00816-8

Cited by 70 publications

(38 citation statements)

References 7 publications

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“…Furthermore, the deposited coating had some micropores in the matrix with 30 wt pct WC addition. The interface between the undissolved WC and the matrix was adherent and defect free, which is similar to the case in the MEZ + Al + Al 2 O 3 coatings [5] and MEZ + SiC coatings. [6] The microstructure in the first layer near the bonding zone was composed of dendrites (spot 1) and eutectics (spot 2 in Figure 3 was formed where W and C content was low in the molten pool, while that in Figure 3(d) was formed where W and C content was high.…”

Section: A Microstructure and Phasessupporting

confidence: 72%

“…The content of W in the third phases was higher than that in both the dendrites and the eutectics. Comparing spots 5, 6, and 9, we can see that W content in these three different shapes from high to low was block or star shapes (6), dendrite or rod shapes (9), and flower or coral shapes (5). Further, the corresponding W content in them were around 39 at.…”

Section: A Microstructure and Phasesmentioning

confidence: 90%

“…Ceramic materials are often added to metal matrix to form composite coatings to improve the wear resistance of the matrix. [5,6] Cobalt is often mixed with WC in composites for promoting wear resistance and high-temperature properties. Literature on the study of Co-WC is widely available.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Wear Behavior of Laser-Aided Direct Metal Deposited Co-285 and Co-285 + WC Coatings

Sun

Liu

Song

et al. 2010

Metall Mater Trans A

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The laser-aided direct metal deposition technique was used to form Co-285 superalloy (A) and Co-285 + 30 wt pct WC (B) wear-resistant coatings on 1018 mild steel. Microstructure, element distribution, phases, microhardness distribution, and wear properties of the two coatings were investigated using scanning electron microscopy (SEM) with energy-dispersive X-ray (EDX) spectrometry, scanning transmission electron microscopy (TEM), X-ray diffractometry (XRD), microhardness testing, and wear testing. Results indicate that both of the coatings had dense structures, as well as a metallurgical bonding with the substrate. In addition, coating B had microcracks and randomly distributed undissolved WC particles in it. Coating A was composed of a-Co dendrites, Co 3 W precipitates, and eutectics, while coating B was composed of undissolved WC, Co-rich dendrites, eutectics, and the W-rich third phases with various shapes. Crack behavior in coating B was also discussed. The average microhardness of the matrix in coating B was 751 HV 0.5 , which was almost 1.8 times that of coating A (420 HV 0.5 ). Wear results indicate that the wear resistance of coating B was improved by 6.8 times compared with that of coating A. The improvement in wear resistance is believed to be partially due to the undissolved WC and the formation of large numbers of carbides in the matrix working as wear-resistant phases and partially due to the good bonding between the hard phases and the tough matrix.

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Section: A Microstructure and Phasessupporting

confidence: 72%

Section: A Microstructure and Phasesmentioning

confidence: 90%

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Microstructure and Wear Behavior of Laser-Aided Direct Metal Deposited Co-285 and Co-285 + WC Coatings

Sun

Liu

Song

et al. 2010

Metall Mater Trans A

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“…The distribution of WC particles in the coated zone also depends on melt pool convection currents and solidification time. Majumdar et al 62 performed LSC on MEZ using Al and Al 2 O 3 in the ratio of 3:1. In this process, Al was alloyed with Mg matrix and Al 2 O 3 particles were distributed throughout the matrix.…”

Section: Microstructure Analysismentioning

confidence: 99%

Laser Surface Engineering of Magnesium Alloys: A Review

Singh

Harimkar

2012

JOM

125

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Magnesium (Mg) and its alloys are well known for their high specific strength and low density. However, widespread applications of Mg alloys in structural components are impeded by their insufficient wear and corrosion resistance. Various surface engineering approaches, including electrochemical processes (plating, conversion coatings, hydriding, and anodizing), gas-phase deposition (thermal spray, chemical vapor deposition, physical vapor deposition, diamond-like coatings, diffusion coatings, and ion implantation), and organic polymer coatings (painting and powder coating), have been used to improve the surface properties of Mg and its alloys. Recently, laser surface engineering approaches are attracting significant attention because of the wide range of possibilities in achieving the desired microstructural and compositional modifications through a range of laser-material interactions (surface melting, shock peening, and ablation). This article presents a review of various laser surface engineering approaches such as laser surface melting, laser surface alloying, laser surface cladding, laser composite surfacing, and laser shock peening used for surface modification of Mg alloys. The laser-material interactions, microstructural/compositional changes, and properties development (mostly corrosion and wear resistance) accompanied with each of these approaches are reviewed.

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“…Conventional processing of 316L can provide crystalline anisotropy and inter-crystalline defects. The latter crystalline features can provide the dislocation nucleation sites and shorter diffusion paths for enhanced oxidation and corrosion degradation [7,8]. Laser treatments can provide more homogenous structures and amorphisation which can overcome this latter problem.…”

Section: Introductionmentioning

confidence: 99%

Process mapping of laser surface modification of AISI 316L stainless steel for biomedical applications

2010

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A 1.5-kW CO 2 laser in pulsed mode at 3 kHz was used to investigate the effects of varied laser process parameters and resulting morphology of AISI 316L stainless steel. Irradiance and residence time were varied between 7.9 to 23.6 MW/cm 2 and 50 to 167 µs respectively. A strong correlation between irradiance, residence time, depth of processing and roughness of processed steel was established. The high depth of altered microstructure and increased roughness were linked to higher levels of both irradiance and residence times. Energy fluence and surface temperature models were used to predict levels of melting occurring on the surface through the analysis of roughness and depth of the region processed. Microstructural images captured by the SEM revealed significant grain structure changes at higher irradiances, but due to increased residence times, limited to the laser in use, the hardness values were not improved.

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Laser surface engineering of a magnesium alloy with Al+Al2O3

Cited by 70 publications

References 7 publications

Microstructure and Wear Behavior of Laser-Aided Direct Metal Deposited Co-285 and Co-285 + WC Coatings

Microstructure and Wear Behavior of Laser-Aided Direct Metal Deposited Co-285 and Co-285 + WC Coatings

Laser Surface Engineering of Magnesium Alloys: A Review

Process mapping of laser surface modification of AISI 316L stainless steel for biomedical applications

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