Nickel-based superalloys belong to a special class of high-performance alloys that feature large amounts nickel. The uniqueness lies in their design features, most notably mechanical strength, durability, etc. Inconel 718 (IN718) is nickel-based superalloy exhibits high tensile and impact-resistant properties, along with good high-temperature corrosion resistance. Selective Laser Melting (SLM) ...

Interfacial thermal conductance (ITC) affects heat transfer in many physical phenomena and is an important parameter for various technologies. The article considers the influence of mesoscopic effects on ITC, such as through gas gap, near-field radiative transfer, changes wetting behavior during melting. Various contributions to ITC liquid-solid interfaces processes fast pre-melting melting met...

Introduction Whispering Gallery Mode (WGM) microlasers have been of a great interest owing to their low threshold and narrow linewidth lasing due to their high Q and small mode volume. Most of the fabrication methods [1-3] are non-controllable and non-reproducible which rely on fiber-tip melting, such as microspheres [3, 4] or splicing of small active-fiber stubs [3]. Microresonators are realiz...

We have studied the dewetting of thin liquid metal films (Au, Cu, Ni) on fused silica substrates which occurs after melting with a Q-switched laser pulse. Optical microscopy, scanning electron microscopy, and scanning near field acoustic microscopy reveal two distinctly different modes of the dewetting process: On one hand, we observe heterogeneous nucleation of “dry” circular patches, which gr...

Laser additive technology manufacturing is a method that realizes the combination of precise "shape control" complex structure and high-performance "controllability". After rapid solidification, it forms surface coating or matrix with very low dilution. Such can effectively combine metallurgical technology, improve wear resistance, corrosion heat oxidation resistance other properties material, ...

Crystallinity of semicrystalline polymers such as aliphatic homopolymer poly(L-lactic acid) (PLLA) affects their degradation and physical properties. In this paper, the effects of laser irradiation using the third harmonic of a Nd:YAG laser on the crystallinity, long-range order, and short-range conformations at the surface of PLLA films are investigated. The factors affecting the transformatio...

Because of its simple composition, vast availability in pure form and ease of processing, vitreous silica is often used as a model to study the physics of amorphous solids. Research in amorphous silica is also motivated by its ubiquity in modern technology, a prominent example being as bulk material in transmissive and diffractive optics for high-power laser applications such as inertial confin...

We have successfully employed femtosecond laser to craft microstructures on polymeric substrate to imbed micro-mixiers. Since the laser pulse is ultra-short, the heat affected zone is not significant. Therefore the thermal melting damage is not as severe as that using continuous carbon dioxide laser. As a result, using femtosecond laser the fabrications of reproducible and defined micro-structu...

The current work examines the heat-and-mass transfer process in the laser multilayered cladding of H13 tool steel powder by numerical modeling and experimental validation. A multiphase transient model is developed to investigate the evolution of the temperature field and flow velocity of the liquid phase in the molten pool. The solid region of the substrate and solidified clad, the liquid regio...