Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The surface-tension-driven Benard conventions and unique sub-grain
  cellular microstructures in 316L steel selective laser melting   The unique sub-grain patterns have been found in some particular alloys
(316L, Al-Si, Co-Cr-Mo) selective laser melting (SLM), the submicron-scale
cellular, elongated cellular or even band structures are always coexisting
inside one single macro-solidified grain. Furthermore, the cellular structures
are symmetrical with hexagonal, pentagonal and square cellular patterns where
the cellular size is only around 1{\mu}m. Single-layer and bulk 316L SLM
experiments are presented that reveals the forming mechanism of these sub-grain
cellular microstructures. Complex cellular sub-micron patterns were formed by
the local convection and B\'enard Instabilities in front of the solid/liquid
(S/L) interface (so-called mushy zones) affected by intricate temperature and
surface tension gradients. In other words, this nonlinear self-organization
phenomenon (B\'enard Instability) occurring at the S/L interface is
superimposed on the macro-grain solidification process to form the sub-grain
patterns/structures and elemental microsegregations. This simple and unified
explanation can be expanded to other eutectic alloys formed by SLM, like the
Al-Si system.

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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn