Alloy Metal Part Aluminum Die Casting Parts

The internal stress generated during the heat treatment of forgings includes thermal stress and phase change stress, and their formation causes and effects are different.

Thermal stress is the phenomenon of thermal expansion and contraction when the forging is heated and cooled. When the surface and the core of the forging are heated or cooled at different speeds, resulting in a temperature difference, the expansion or contraction of the volume is different on the surface and the core. This kind of internal stress caused by the non-timeliness of the volume change due to the temperature difference is called thermal stress.

During the heat treatment process of the forging, the thermal stress changes mainly as follows: when the forging is heated, the surface heats up faster than the core, the surface temperature is high and expands, and the core temperature is low without expansion. At this time, the surface is under compressive stress and the core Tensile stress

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