In Situ Laser Synthesis of Fe-Based Amorphous Matrix Composite Coating on Structural Steel

Katakam, Shravana; Hwang, Jun Yeon; Paital, Sameer R.; Banerjee, Rajarshi; Vora, Hitesh D.; Dahotre, Narendra B.

doi:10.1007/s11661-012-1312-4

Cited by 47 publications

(18 citation statements)

References 34 publications

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“…According to previous studies on laser processing of crystalline and non-crystalline materials, higher laser energies result in a higher local cooling rate due to a greater temperature difference between the melt pool and surrounding material [27,29]. This higher cooling rate should favor the retention of the amorphous nature of the Al 86 Ni 6 Y 4.5 Co 2 La 1.5 MG.…”

Section: Devitrificationmentioning

confidence: 93%

“…If the value of PE is much large than 1, the convection plays a dominant role in heat transfer within the melt pool. Since the coefficient of the surface tension is negative in metals [25] and the Gaussian distribution of the laser energy (TEM 00 , M 2 < 1.05) results in the center of the melt pool having a higher temperature [27], the liquid flows from the center of the melt pool to the edge.…”

Section: Melt Pool Morphologymentioning

confidence: 99%

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Selective laser melting of an Al86Ni6Y4.5Co2La1.5 metallic glass: Processing, microstructure evolution and mechanical properties

Kang

Huang

et al. 2014

Materials Science and Engineering: A

141

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In this study, single line scans at different laser powers were carried out using selective laser meting (SLM) equipment on a pre-fabricated porous Al86Ni6Y4.5Co2La1.5 metallic glass (MG) preform. The densification, microstructural evolution, phase transformation and mechanical properties of the scan tracks were systematically investigated. It was found that the morphology of the scan track was influenced by the energy distribution of the laser beam and the heat transfer competition between convection and conduction in the melt pool. Due to the Gaussian distribution of laser energy and heat transfer process, different regions of the scan track experienced different thermal histories, resulting in a gradient microstructure and mechanical properties. Higher laser powers caused higher thermal stresses, which led to the formation of cracks; while low power reduced the strength of the laser track, also inducing cracking. The thermal fluctuation at high laser power produced an inhomogeneous chemical distribution which gave rise to severe crystallization of the MG, despite the high cooling rate. The crystallization occurred both within the heat affected zone (HAZ) and at the edge of melt pool. However, by choosing an appropriate laser power crack-free scan tracks could be produced with no crystallization. This work provides the necessary fundamental understanding that will lead to the fabrication of large-size, crack-free MG with high density, controllable microstructure and mechanical properties using SLM

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Section: Devitrificationmentioning

confidence: 93%

Section: Melt Pool Morphologymentioning

confidence: 99%

Selective laser melting of an Al86Ni6Y4.5Co2La1.5 metallic glass: Processing, microstructure evolution and mechanical properties

Kang

Huang

et al. 2014

Materials Science and Engineering: A

141

View full text Add to dashboard Cite

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“…c (100 C min À1 ) is the heating rate employed, r s (10 mm) is the radius of the sample and k S (40 Wm À1 K À1 ) and k D (129 Wm À1 K À1 ) are the thermal conductivities of the fully dense amorphous alloy [41] and graphite, [30] respectively. c (100 C min À1 ) is the heating rate employed, r s (10 mm) is the radius of the sample and k S (40 Wm À1 K À1 ) and k D (129 Wm À1 K À1 ) are the thermal conductivities of the fully dense amorphous alloy [41] and graphite, [30] respectively.…”

Section: Resultsmentioning

confidence: 99%

Densification and Crystallization in Fe–Based Bulk Amorphous Alloy Spark Plasma Sintered in the Supercooled Liquid Region

2017

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Spark plasma sintering of Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 bulk amorphous alloy at a range of temperatures in the supercooled liquid region (SLR) and above yielded near fully dense compacts. Upon sintering in the temperature range of 570-630 C in SLR, large increments in density are observed due to enhanced sintering resulting from drastic reduction in the viscosity of the alloy. Above 630 C, the absence of sufficient driving force for sintering and stiffening of the amorphous matrix from partial crystallization leads to sluggish densification. Analysis of the temperature profile in the sample and the die reveals that the temperature at the center of the sample is higher than that at the inner wall of the die as recorded by the thermocouple and the difference between the two is estimated to be between 31 and 53 C.

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“…[84,85] This is because that although the overall heating and cooling rates during metal additive manufacturing is reported to be very high at the order of 10 3 -10 8 K s À1 , [86] the local heating and cooling rate may vary. [87] The second reason is the strong directional global heat flux in the metal additive manufacturing process. The first reason is the intrinsic energy distribution of energy source, for example, the Gaussian-like distribution of the laser beam.…”

Section: Additive Manufacturing and Requirements For Producing Bulk Mmentioning

confidence: 99%

“…The first reason is the intrinsic energy distribution of energy source, for example, the Gaussian-like distribution of the laser beam. [87] The second reason is the strong directional global heat flux in the metal additive manufacturing process. [88] Therefore, some regions of the materials will probably undergo a relatively low cooling rate compared to other regions.…”

Section: Additive Manufacturing and Requirements For Producing Bulk Mmentioning

confidence: 99%

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

2017

Adv Eng Mater

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Bulk metallic glasses (BMGs) and high entropy alloys (HEAs) are both important multi-component alloys with novel microstructures and unique properties, which make them promising for applications in many industries. However, certain hindrances have been identified in the fabrication of BMGs and HEAs by conventional techniques due to the intrinsic requirements of BMGs and HEAs. With the advent of metal additive manufacturing, new opportunities have been perceived to fabricate geometrically complex BMGs and HEAs with tailorable microstructure theoretically at any site within the specimen, which are not achievable using conventional fabrication techniques. After providing some background and introducing the conventional fabrication techniques for BMGs and HEAs, this review will focus on the current status, development, and challenges in metal additive manufacturing of BMGs and HEAs including different additive manufacturing techniques being used, microstructure design and evolution, as well as properties of the fabricated BMGs and HEAs. A future outlook of metal additive manufacturing of BMGs and HEAs will also be provided at the end.

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In Situ Laser Synthesis of Fe-Based Amorphous Matrix Composite Coating on Structural Steel

Cited by 47 publications

References 34 publications

Selective laser melting of an Al86Ni6Y4.5Co2La1.5 metallic glass: Processing, microstructure evolution and mechanical properties

Selective laser melting of an Al86Ni6Y4.5Co2La1.5 metallic glass: Processing, microstructure evolution and mechanical properties

Densification and Crystallization in Fe–Based Bulk Amorphous Alloy Spark Plasma Sintered in the Supercooled Liquid Region

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

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