Influence of Modification Treatment and Heat Treatment on Properties and Microstucture of Casting Lead Brass
The influence of modification and different heat treatment process on mechanical properties and microstructure of ZCuZn40Pb2 casting lead brass was studied. The experiment results show that as cast structure of ZCuZn40Pb2 lead brass without additive is coarse, however , the microstructure with additive is changed into short banding from long lath, the microstructure of lead brass is refined, the mechanical property significantly improves. After modification treatment, the solid solution treatment at 500 ℃and aging treatment at 200 ℃ are performed, the microstructure changes into fine equiaxed grains, the plasticity improves and the higher mechanical properties are obtained. With the increase of temperature of solid solution and aging treatment, the microstructure is gradually getting coarse, and the strength descends.