Notes

AFFECTING ELEMENTS OF THE OPTION TREATMENT
Remedy treatment describes the heat therapy process in which the alloy is heated to the heat single-phase zone and kept at a continuous temperature level, to make sure that the excess phase is totally dissolved into the strong service and then cooled down promptly to acquire the supersaturated strong solution. It is typically used for spreadings.
Home heating temperature level, holding time and also cooling rate are the major parameters that ought to be managed in solution therapy.
1. In concept, the home heating temperature level can be identified according to the equivalent stage layout. The upper limit temperature is usually near the strong line temperature level or eutectic temperature level. At such a high temperature, the alloy has the maximum strong solubility as well as quick diffusion price. Yet the temperature level must not be expensive, otherwise it will certainly bring about reduced melting point eutectic and also grain boundary stage melting, that is, over-burning sensation, creating quenching splitting and lowering strength. The minimal home heating temperature level ought to be more than the solution curve, otherwise the efficiency will not satisfy the needs after aging. The series of permissible home heating temperature levels may differ commonly from alloy to alloy. The heating temperature variety of some copper alloys and alloy steels is broad, while the quenching temperature level range of the majority of aluminum alloys is really slim, some even only ± 5 ℃.
Aluminum Die Casting
2. The function of heat conservation is to sufficiently change the alloy framework to the state needed for quenching. The holding time mainly relies on the alloy composition, the product pretreatment and original framework, heating temperature level and so on, but likewise with the amount of heating system, work surface density, home heating technique as well as other aspects. The initial structure is great, the home heating temperature level is high, the loading amount is little, the workpiece section size is small, the holding time is short.
3. Quick cooling is usually utilized in solution treatment. The objective of rapid cooling is to prevent the rainfall of the second phase throughout the cooling procedure as well as ensure the optimum supersaturation of solute atoms and jobs, so as to get the highest possible strength and also ideal corrosion resistance after aging. Water is widely utilized as an effective relieving medium, and also the cooling rate attained by quenching in water can satisfy the requirements of the majority of light weight aluminum, magnesium, copper, nickel and iron based alloy items. However, satiating in water can easily cause huge residual anxiety and deformation. To overcome this shortcoming, the water temperature level can be properly raised, or quenched in oil, air as well as some special organic media. Some special quenching methods, such as isothermal quenching and also fractional quenching, can additionally be utilized.

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