fine grain structureの例文

• Metals with fine grain structure before melting provide superior wetting to metals with large grains.
• Cryptocrystalline rocks are good to use for ground stones because they have a very fine grain structure.
• Generally speaking, an area of the casting which is cooled quickly will have a fine grain structure and an area which cools slowly will have a coarse grain structure.
• A fine grain structure can be induced by " grain refinement " or " inoculation ", which is the process of adding impurities to induce nucleation.
• Olivine, chromite, etc . are therefore used because they do not have a phase transition that causes rapid expansion of the grains, as well as offering greater density, which cools the metal faster, producing finer grain structures in the metal.
• In metals and ceramics, requirements for it being superplastic include a fine grain size ( less than approximately 20 micrometres ) and a fine dispersion of thermally stable particles, which act to pin the grain boundaries and maintain the fine grain structure at the high temperatures and existence of two phases required for superplastic deformation.