SALAR NIKNAFS

Salar Niknafs. sniknafs. Steel Solidification Dendrites Cellular Microstructure. Phase field simulation of solidification. confocal microscopy.

Model of dendritic solidification

 

Dendritic structures are one of the most frequent patterns in nature, that appear in crystalline systems (such as metals), advanced ceramics and neural systems of the living organisms. A classic example is the six-fold radial symmetry of snowflakes. Every second, about 10 million metallic dendrites are produced globally during solidification processes, while the human brain alone has a hundred billion neurons, each being connected to the neighboring cells with dendritic receivers and axon terminals (transmitters). These self-organized patterns exhibit unique properties that have attracted a great deal of scholarly interest in science, engineering and design [...]

 

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Salar Niknafs. sniknafs. Steel Solidification Dendrites Cellular Microstructure. Phase field simulation of solidification. confocal microscopy.

Solidification Patterns in Metallic Systems

 

Solidification patterns in crystalline systems are one the most aesthetically pleasing examples of pattern formation in nature. During solidification when a planar solid/liquid interface becomes unstable, it reorganizes itself into cellular and dendritic micro arrangements. These interfacial patterns appear as fractal features and their level of complexity is characterized by their fractal dimension or by their primary and secondary arms spacing. In metallic systems, because solidification microstructure is a defining link between production techniques and the mechanical properties, it is technologically crucial and economically favored to achieve desired properties of the final product through a controlled solidification process [...]

 

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Salar Niknafs. sniknafs. Steel Solidification Dendrites Cellular Microstructure. Phase field simulation of solidification. confocal microscopy.

Applied Research

 

Maintaining an international contact at a high academic level, principally involved in applied research and education in the field of physical metallurgy. The Process Engineering Group specializes in unique experimental facilities such as the state-of-art high-temperature laser-scanning confocal microscopy (HT-LSCM), computational engineering (MICRESS®, Thermo-CalcTM, DictraTM) and has access to a range of sophisticated instruments within the UOW and at the collaborative organizations [...]

 

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Salar Niknafs. sniknafs. Steel Solidification Dendrites Cellular Microstructure. Phase field simulation of solidification. confocal microscopy.

Publications

 

Image: Tracking the delta-ferrite/austenite phase interface during continuous cooling at a constant rate, under uniform temperature gradient. Austenite nuclei precipitated when they became thermodynamically stable at δ-triple points mostly assuming an initial trihedral shape. The γ-phase then gradually grow along δ grain boundaries and into the matrix with a slightly curved but planar growth front. The exact way in which delta-ferrite transforms to austenite could influence the subsequent transformation of austenite to ferrite, by which much of the mechanical properties of the steel is determined.

 

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