Laser surface coating of Fe–Cr–Mo–Y–B–C bulk metallic glass composition on AISI 4140 steel

Basu, A.; Samant, Anoop N.; Harimkar, Sandip P.; Majumdar, Jyotsna Dutta; Manna, I.; Dahotre, Narendra B.

doi:10.1016/j.surfcoat.2007.09.028

Cited by 137 publications

(65 citation statements)

References 21 publications

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“…This indicates that the cooling rate experienced by the deposited materials was high enough to form an amorphous microstructure, consistent with that reported for these Fe-based MGs. [19,34] The top surface contained some partly unmelted particles that retained the original partially amorphous structure of the powder, as shown in Figure 3(a). These particles will be completely melted and resolidified during the subsequent layer deposition, because the surface of the previously deposited layer is always partially remelted by the laser beam during deposition.…”

Section: Microstructure Of Lens-deposited Samplesmentioning

confidence: 99%

Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping

Zheng

Zhou

Smugeresky

et al. 2009

Metall Mater Trans A

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In this article, the laser-engineered net shaping (LENS) process is implemented to fabricate netshaped Fe-based Fe-B-Cr-C-Mn-Mo-W-Zr metallic glass (MG) components. The glass-forming ability (GFA), glass transition, crystallization behavior, and mechanical properties of the glassy alloy are analyzed to provide fundamental insights into the underlying physical mechanisms. The microstructures of various LENS-processed component geometries are characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The results reveal that the as-processed microstructure consists of nanocrystalline a-Fe particles embedded in an amorphous matrix. An amorphous microstructure is observed in deposited layers that are located near the substrate. From a microstructure standpoint, the fraction of crystalline phases increases with the increasing number of deposited layers, effectively resulting in the formation of a functionally graded microstructure with in-situ-precipitated particles in an MG matrix. The microhardness of LENS-processed Fe-based MG components has a high value of 9.52 GPa.

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Section: Microstructure Of Lens-deposited Samplesmentioning

confidence: 99%

Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping

Zheng

Zhou

Smugeresky

et al. 2009

Metall Mater Trans A

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“…The crystallization of many amorphous materials upon laser melting is reported in the literature. [30][31][32] Hence, laser melting and rapid re-solidification (into amorphous structures) are unlikely to explain the retention of an amorphous structure in ribbons laser treated with 10 and 12 J Á cm À2 laser fluences. Furthermore, a careful observation of the surface of laser treated samples did not reveal any marks, such as a recast layer and dross corresponding to laser melting (Fig.…”

Section: Resultsmentioning

confidence: 99%

Periodically Laser Patterned FeBSi Amorphous Ribbons: Phase Evolution and Mechanical Behavior

et al. 2011

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Bulk metallic glasses or amorphous alloys, in contrast to crystalline materials, exhibit superior properties, such as high hardness, elastic modulus/limits, and corrosion/wear resistance because of their disordered atomic structure without long-range periodicity. [1][2][3][4] These alloys are attracting increasing attention as potential materials for a range of applications in structural, biomedical, and microelectronic industries. [5][6][7][8][9][10][11] However, the actual utilization of amorphous materials in practical applications is limited due to their near-complete brittleness accompanied with strain softening and shear localization. This limited plasticity of amorphous materials is often attributed to the initiation and propagation of localized regions of extensive plastic deformation known as shear bands. [12][13][14][15] There has been a great thrust toward improving the overall global plasticity of amorphous materials by designing amorphous matrix composites reinforced with crystalline phases. [16][17][18] The amorphous matrix composites can also be formed in situ by controlled thermal processing such that partial devitrification results in precipitation of small crystallites in the amorphous matrix. These reinforced crystalline phases are expected to promote the initiation of shear bands and also hinder the propagation of shear bands, thus enhancing the global plasticity of the amorphous materials. [19][20][21][22][23] Most of the ductility-enhancement methods applied to amorphous materials are focused on designing bulk amorphous matrix composites with reinforced crystalline phases. [24,25] However, the role of surface treatments on the deformation and failures of amorphous materials is not well studied. Recently, significant research interests are attracted toward enhancing the plasticity of the amorphous materials by means of surface engineering methods. Most of the interests were invigorated after the publication of a paper by Zhang et al. regarding plasticity enhancement (plasticity in compression and bending) of amorphous materials by controlling the residual state of stresses on the surface of amorphous materials. [26] The compressive surface stresses were induced in the Zr-based amorphous materials by a shot-peening method. The compressive stresses in the peened surfaces caused more shear bands with smaller shear on each band, thus facilitating general continuing plasticity instead of a premature failure on few dominant shear bands. It was observed that the enhanced plasticity in compression and bending is due to a combination of a reduced likelihood of surface cracking and more uniform deformation induced by high population of pre-existing shear bands. [26] More recently, a controlled surface crystallization of amorphous materials by a surface mechanical attrition treatment (SMAT) has beenThe properties of amorphous alloys are significantly influenced by structural relaxation and partial/full crystallization induced by thermal annealing of the alloy. In this paper, the phase evolution and mech...

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“…Several compositions of BMGs based on Fe-, Zr-, Cu-, Mg-, Ti-, Ni-, and Pd-based alloy systems have been developed [5]. The amorphous alloys, in the form of coatings, are also being considered in diverse applications [6][7][8]. In most of these applications of amorphous alloys and their coatings, wear and friction properties are of primary interest or at least an important consideration.…”

Section: Introductionmentioning

confidence: 99%

Dry Sliding Wear Behavior of Spark Plasma Sintered Fe-Based Bulk Metallic Glass/Graphite Composites

Alavi

Harimkar

2016

Technologies

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Bulk metallic glass (BMG) and BMG-graphite composites were fabricated using spark plasma sintering at the sintering temperature of 575 • C and holding time of 15 min. The sintered composites exhibited partial crystallization and the presence of distributed porosity and graphite particles. The effect of graphite reinforcement on the tribological properties of the BMG/graphite composites was investigated using dry ball-on-disc sliding wear tests. The reinforcement of graphite resulted in a reduction in both the wear rate and the coefficient of friction as compared to monolithic BMG samples. The wear surfaces of BMG/graphite composites showed regions of localized wear loss due to microcracking and fracture, as was also the case with the regions covered with graphite-rich protective film due to smearing of pulled off graphite particles.

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Laser surface coating of Fe–Cr–Mo–Y–B–C bulk metallic glass composition on AISI 4140 steel

Cited by 137 publications

References 21 publications

Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping

Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping

Periodically Laser Patterned FeBSi Amorphous Ribbons: Phase Evolution and Mechanical Behavior

Dry Sliding Wear Behavior of Spark Plasma Sintered Fe-Based Bulk Metallic Glass/Graphite Composites

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