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·­Ò룺In polycrystalline materials, grain size and their uniformity are key factors to influence material properties. T
he heat treatment technology is adopted to control the grain growth is one of the commonly used methods to improve material properties.
Although in most cases the grain refinement is useful, but sometimes there are also disadvantages for too fine grain, especially for high temperature alloy with coarse grain to ensure high temperature strength and creep resistance.

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The grain size and uniformity are two key influential factors for polycystalline materials.One commonly used way to improve performance of the material is to control the grain growth with heat treatment technology. Although grain refinement is beneficial in most cases, it's not always the case, especially for the high-temperature alloy when coarse grains are expected to ensure high-temperature strength and creep resistance.
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