[Technology] Heat treatment process for casting magnesium alloy castings

The purpose of heat treatment of magnesium alloy castings is to improve its mechanical properties, such as tensile strength, yield strength, elongation or plasticity, hardness and impact toughness, to varying degrees. Some heat treatment is to reduce the casting casting stress or quenching stress and the growth tendency when working at high temperature, so as to achieve the purpose of stable size.

Whether the magnesium alloy can be strengthened by the heat treatment, that is, its mechanical properties, depends on whether the solubility of each component in the solid solution in the alloy changes with the temperature. Diffusion of magnesium is slow in the process of diffusion and decomposition of solid solution. Therefore, the heating time is longer in solid solution and aging treatment, and the solid solution does not decompose when cooled in air or hot water.

Magnesium alloys are not sensitive to natural aging and can remain in the quenched state at room temperature after quenching. Some alloys require artificial aging in order to increase the yield strength, and the holding time during artificial aging is also longer.

Magnesium alloys tend to oxidize more strongly than aluminum alloys, so the heating temperature of magnesium alloys should be accurately controlled. To prevent oxidation, the protective gas must be introduced into the furnace as often as so: or a certain amount of pyrite ore JA is placed in the furnace. To prevent oxidation or combustion of magnesium alloys.

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