Notes

INFLUENCING VARIABLES OF THE SOLUTION TREATMENT
Solution treatment refers to the warm treatment procedure in which the alloy is heated up to the heat single-phase area and kept at a consistent temperature level, to make sure that the excess phase is completely liquified into the strong solution and afterwards cooled down promptly to get the supersaturated strong service. It is usually used for spreadings.
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Heating temperature, holding time as well as air conditioning price are the primary parameters that ought to be managed in solution treatment.
1. In principle, the heating temperature can be established according to the equivalent phase representation. The upper limit temperature level is normally near the strong line temperature or eutectic temperature level. At such a high temperature, the alloy has the optimum solid solubility as well as fast diffusion rate. But the temperature level ought to not be expensive, otherwise it will bring about low melting point eutectic and grain boundary stage melting, that is, over-burning sensation, triggering relieving breaking as well as minimizing toughness. The minimal heating temperature level must be more than the solution curve, or else the efficiency will certainly not fulfill the requirements after maturing. The series of acceptable heating temperature levels might differ commonly from alloy to alloy. The heating temperature level range of some copper alloys and alloy steels is wide, while the satiating temperature series of many light weight aluminum alloys is very narrow, some also just ± 5 ℃.
2. The purpose of warmth preservation is to sufficiently transform the alloy framework to the state needed for quenching. The holding time mostly depends upon the alloy composition, the product pretreatment and also original structure, heating temperature and so forth, but likewise with the amount of heater, work surface thickness, home heating method and other factors. The initial framework is fine, the home heating temperature is high, the filling amount is tiny, the work surface section size is small, the holding time is short.
3. Rapid cooling is usually used in solution therapy. The purpose of fast air conditioning is to prevent the rainfall of the second phase during the cooling process and guarantee the maximum supersaturation of solute atoms as well as vacancies, so as to get the highest stamina as well as ideal corrosion resistance after aging. Water is commonly utilized as an efficient relieving medium, and the cooling down rate achieved by satiating in water can satisfy the requirements of most light weight aluminum, magnesium, copper, nickel and also iron based alloy products. Nevertheless, relieving in water can conveniently trigger large recurring anxiety as well as deformation. To conquer this imperfection, the water temperature can be properly raised, or quenched in oil, air as well as some unique organic media. Some special quenching methods, such as isothermal quenching and also fractional quenching, can likewise be used.

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