What refers to an excess of changes that stay in place on a material?

An excess of changes that remain in place on a material is often referred to as "residual stress." This phenomenon occurs when a material undergoes deformation or alterations during processes like manufacturing or cooling, yet does not fully return to its original shape. As a result, internal stresses can develop, which may affect the material's performance and longevity. Residual stress is crucial to consider in fields like engineering and materials science.