The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced

The cause of formation of fiber structure, banded structure and deformation texture during cold working and their influence on metal properties are briefly introduced

The banded structure in the metal is the structure defect produced in the process of casting, forging and rolling of iron and steel. In fact, the alloying elements are distributed unevenly in a certain direction in the shape of strip. The segregation of alloying elements between them is serious. They will make the mechanical properties of the material show anisotropy and the reduction of area, especially the transverse performance shadow.

A bottle of saturated solution of a substance, sealed with a cap, solution () A. It becomes an unsaturated solution or remains a saturated solution after precipitation of crystals B. becoming an unsaturated solution C. Unsaturated solution after precipitation of crystals D. Still saturated

This solution is saturated and sealed, so the quality of the solvent will not change, so it will not affect the state of the solution; however, when the temperature changes, whether it increases or decreases, the solubility of the substance will change, which may increase or decrease.
A. If the solubility of the substance increases with the change of temperature, the saturated solution will become unsaturated solution; if the solubility of the substance decreases with the change of temperature, the saturated solution will become supersaturated solution, and some crystals will be precipitated, so the option is correct;
B. If the solubility of the substance increases with the change of temperature, the saturated solution will become unsaturated solution; however, it is not considered that if the solubility of the substance decreases with the change of temperature, the saturated solution will become supersaturated solution and some crystals will be precipitated, so the option is wrong;
C. If the solution precipitates crystals, the solution must be saturated solution, so the option is wrong;
D. If the solubility of the substance increases with the change of temperature, the saturated solution may become unsaturated solution, so the option is wrong.
Therefore, the answer is: A.