Effect of heat treatment on properties of brass
Heat treatment plays an important role in the practical application of brass. The corrosion resistance, wear resistance and workability of brass can be improved by heat treatment, and the mechanical and physical properties of brass can be changed by heat treatment. For different types of brass the heat treatment temperature and the related microstructure properties after heat treatment are briefly described as follows.
The heat working temperature of aluminum brass is 720~770℃, annealing temperature is 600~650℃, and internal stress relieving temperature is 270~350℃. After the above temperature heat treatment, a small amount of aluminum can form a strong oxide film on the surface of the alloy when it encounters the corrosive medium, and improve the alloy gas
Corrosion resistance of body, solution and high speed seawater at the same time, due to the high zinc equivalent coefficient of aluminum, the formation of & Beta; The strength and hardness of the alloy can be significantly improved by the large trend of phase and the high strengthening effect. Hal77-2 is the largest amount of aluminum brass, which is mainly made into pipes with high strength and corrosion resistance material, widely used for sea ships and power plant condenser, etc.
The hot working temperature of nickel brass is 750℃~870℃, the annealing temperature is 600℃~650℃, and the low temperature annealing temperature of eliminating internal stress is 300℃~400℃. Taking HNI65-5 nickel brass as an example, it has good mechanical properties, good machinability and easy welding and welding after the above temperature heat treatment
Brazing, low conductivity, thermal conductivity, high corrosion resistance, and no corrosion cracking tendency, widely used in Marine parts, steam and water pipe fittings, etc.
The hot working temperature of brass is usually 680℃~730℃, and the annealing temperature is 600℃~650℃. As the two most typical types of iron brass, HFE59-1-1 and HFE58-1-1 have higher strength, toughness and good anti-friction properties after heat treatment at the above temperatures.
The seawater has high corrosion resistance and good plasticity in hot state. It is often used to make structural parts that work under the condition of friction and corrosion by seawater.
Tin brass can withstand the heat and cold pressure better processing. For example, HSN70-1, hot rolling at 700~720℃ or hot extrusion at 670~720℃ (strict control of impurity content is required (e.g. Pb<0.03%), copper upper limit (71%), tin lower limit (1.0~ L.2%)) can be effectively used it is mainly used for high strength corrosion-resistant condensing pipes, heat exchangers, ship parts and so on in sea wheel and thermal power plant.
Sadykov with ohters studied the effect of deformable heat treatment on the wear resistance of CuZnPb brass. They found that recrystallization occurs during deformable heat treatment of brass. This process results in the formation of many microcrystalline structures in brass, resulting in a significant increase in wear resistance of brass.
Wilborn studied the effect of heat treatment on warping deformation of machined workpiece and found that proper heat treatment of the workpiece before machining can reduce warping deformation to a certain extent. Mapelli are studying the residual stresses on the failure parts.
It is pointed out that stress release heat treatment can have beneficial effect on residual stress and improve the surface tension. Kim studied the effect of heat treatment on the mechanical properties of brass after equal channel angular extrusion. They found that the corner of the waiting passage was crowded
After pressure, 20 minutes of heat treatment at 350℃ will lead to a significant increase in elongation and a significant decrease in yield strength and ultimate tensile strength, as shown in FIG. 9.K.v.varli studied the effect of different heat treatment temperatures on the properties of 58-2-2-1 brass.
Sigma at different quenching and tempering temperatures; B, & sigma;0.2 and & sigma; S data.
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Excerpt from CHINA National Material environment Corrosion Platform