Solution aging furnace installation

Aluminum alloy solution aging furnace has a certain inevitable relationship with the temperature of aging time, the influence of aging temperature, the influence of residence time from quenching to artificial aging, the influence of alloy chemical composition and the influence of alloy solution treatment process.

When the solid solution aging furnace is aging at different temperatures, the critical nucleus size, quantity, composition and aggregate growth rate of the precipitated phase are different. If the temperature is too low, the G·P zone is not easy to form due to the difficulty of diffusion, and the strength and hardness after aging are low. When the aging temperature is too high, diffusion is easy to take place. That is, it has expired. Therefore, all kinds of alloys have a suitable aging temperature.

1. Prescription time relationship

It was found that some aluminum alloys such as Al-Mg-Si alloy were artificially aged after staying at room temperature, and the strength index of the alloy could not reach z maximum value, but the plasticity increased. For example, ZL101 cast aluminum alloy, after quenching at room temperature for one day and then artificial aging, the strength limit is lower than the quenching immediately after aging 10 ~ 20Mpa, but the plasticity is improved than the aluminum alloy immediately aged.

2, alloying relationship

Whether an alloy can be strengthened through aging depends first on whether the elements of the alloy can be dissolved in the solid solution and the degree to which the solid solubility changes with temperature. For example, the solid solubility of silicon and manganese in aluminum is relatively small and does not change much with temperature, while magnesium and zinc have large solid solubility in the aluminum-based solid solution of the trolley heat treatment furnace, but the structure and matrix of the compounds they form with aluminum have little difference, and the strengthening effect is little. Therefore, binary aluminum-silicon, aluminum-manganese, aluminum-magnesium, and aluminum-zinc are usually not strengthened by aging. Some binary alloys, such as aluminum-copper alloys, and ternary alloys or multi-component alloys, such as aluminum-magnesia-silicon, aluminum-copper-magnesia-silicon alloys, etc., have solubility and solid phase transformation during heat treatment, which can be strengthened by heat treatment.

3, alloy solution treatment temperature relationship

In order to obtain a good aging strengthening effect, under the condition of no overheating, overburning and grain growth, the quenching heating temperature is higher, and the holding time is longer, which is conducive to obtaining a uniform solid solution with z large supersaturation. In addition, the second phase is not precipitated in the quenching cooling process, otherwise the precipitated phase will play a nucleation role in the subsequent aging treatment, resulting in local uneven precipitation and reducing the aging strengthening effect.