Grain size reduction
“Is it possible to increase the strength of a material by reducing the grain size?”
Many materials in their original form are not strong enough for practical engineering purposes. However, is there a way in which we could strengthen a material by modifying its grain structure? Well, let’s look into it. We know that the strength of a material is contingent upon its grain size. Specifically, the smaller the grain sizes are, the more of them will be able to be present within a material. So wouldn’t it logically follow that if we were to reduce the size of grains, the stronger our material would be? This is the fundamental principle behind grain size reduction, and modifies the yield strength of a material by the equation sigma =sigma_0+kdx, where sigma is the new yield stress, sigma_0 is the original yield stress, k is a constant, and d is the grain size.