Aging heat treatment is a classification of heat treatment process for forgings, refers to the metal or alloy workpiece (such as low carbon steel, etc.) by solution treatment, from high temperature quenching or after a certain degree of cold deformation after the placement at a higher temperature or room temperature to keep it The performance, shape, and size of the heat treatment process change over time. In general, after aging, hardness and strength have increased, plastic toughness and internal stress have decreased. Carbon-containing steels have very high hardness immediately after quenching, but their plasticity becomes very low. However, after the quenching of aluminum alloys, the strength or hardness does not immediately reach its peak value, but the plasticity of the aluminum alloy has not decreased but has increased. After a long period of time (for example, 4 to 6 days and nights) at room temperature, the strength and hardness of the quenched alloy increase significantly, while the plasticity decreases. The phenomenon that the strength and hardness of this quenched alloy significantly changes with time is called aging. The aging effect at room temperature is called natural aging, and the aging effect at a certain temperature is called artificial aging. Aging treatment is to deliberately store the material at room temperature or at a relatively high temperature for a long time to produce an aging process.