Notes

INFLUENCING ELEMENTS OF THE OPTION THERAPY
Remedy treatment refers to the warmth treatment process in which the alloy is warmed to the heat single-phase zone and preserved at a constant temperature, to make sure that the excess stage is fully liquified into the strong option and then cooled down rapidly to obtain the supersaturated strong solution. It is normally utilized for spreadings.



Heating temperature, holding time and cooling price are the major criteria that need to be regulated in solution treatment.



1. In principle, the home heating temperature can be figured out according to the equivalent stage diagram. Bronze Casting is generally close to the solid line temperature or eutectic temperature level. At such Brass Casting , the alloy has the optimum solid solubility as well as fast diffusion price. However the temperature level ought to not be expensive, otherwise it will cause low melting point eutectic and grain border phase melting, that is, over-burning phenomenon, creating relieving fracturing and minimizing strength. The minimum heating temperature should be greater than the remedy contour, otherwise the efficiency will certainly not meet the demands after maturing. The range of permitted heating temperature levels might differ commonly from alloy to alloy. The heating temperature variety of some copper alloys and alloy steels is large, while the satiating temperature variety of a lot of aluminum alloys is really slim, some even only ± 5 ℃.



2. The objective of warmth preservation is to sufficiently change the alloy structure to the state needed for quenching. The holding time mainly depends on the alloy structure, the product pretreatment and also initial framework, heating temperature and more, however also with the amount of heater, workpiece thickness, heating method and also other aspects. The original framework is great, the home heating temperature is high, the packing amount is little, the work surface section dimension is small, the holding time is short.





3. Rapid air conditioning is usually made use of in solution treatment. The purpose of fast air conditioning is to hinder the precipitation of the 2nd stage during the cooling procedure and make certain the maximum supersaturation of solute atoms as well as jobs, so as to acquire the highest possible strength and also ideal corrosion resistance after aging. Water is widely made use of as an efficient relieving medium, and the cooling down speed attained by satiating in water can meet the requirements of a lot of light weight aluminum, magnesium, copper, nickel as well as iron based alloy items. Nevertheless, satiating in water can quickly trigger large residual tension and also contortion. To overcome this imperfection, the water temperature level can be suitably elevated, or satiated in oil, air as well as some special organic media. Some unique quenching methods, such as isothermal quenching and also fractional quenching, can likewise be made use of.
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