The silicon brass bushings were prepared by spinning. The microstructure and properties of the bushing before and after spinning were compared

and the microstructure evolution and strengthening mechanism were analyzed. The results indicate that silicon brass bushing with excellent performance was obtained by spinning process. After spinning

the tensile strength

yield strength

elongation and Brinell hardness reach up to 638.3 MPa

543.7 MPa

14.7% and 183.3 HB

respectively

which can be comparable to the foreign advanced level. Large amounts of deformation structures such as slip lines

twins

broken crystals

and sub-crystals are generated in the silicon brass bushing. The grains are refined while the number of small angle grain boundaries is increased

and the β phase with high strength is precipitated along the grain boundary in form of dots

which synergistically contribute to the improvement of material strength and hardness.