Effect of cerium on properties of tin phosphor bronze alloy

Cerium pairs phosphor bronze that has been cast, homogenized, and recrystallized, The influence of the microstructure characteristics of alloy, through equipment and electron microscope analysis, add a small amount of rare earth cerium tin phosphor bronze alloy casting organization dendrite grid becomes small, deformation after annealing organization obviously refined grains, add a small amount of rare earth cerium can purify the harmful impurities or eliminate the harmful effect from the alloy, and with copper can generate CuCeP intermetallic compound, diffuse in the grain boundary or distributed Intracrystalline, these are small black spots in the second phase in the distribution of the alloy, and significantly improve the strength and hardness of alloy with the addition cerium ions, and to determine the optimum adding amount of cerium in tin phosphor bronze is 0.10% ~ 0.15%, which effectively improved the comprehensive performance of tin phosphor bronze alloy, prolong the service life of the copper alloy materials, tin phosphor bronze QSn7-0.2 is braided copper network In ORDER TO IMPROVE THE STRENGTH, HARDNESS AND processing PERFORMANCE OF THE MATERIAL AND prolong the service life of the copper mesh, the TIN-phosphor bronze with a small amount of rare earth CERium was experimentally studied. The strength and hardness of the copper mesh produced by this material were increased, and the service life was prolonged, and good economic benefits were produced. Tin phosphor bronze mechanical properties testing and microstructure observation, the research of as-cast structure of cerium on the tin phosphor bronze and the effect of homogenization and recrystallization annealing organization, in order to further improve the comprehensive performance of tin phosphor bronze, with the addition cerium ions to extend its application field, electrolytic copper, tin, copper number one - phosphorus intermediate alloy and copper - cerium intermediate alloy by QSn7 0.2 ingredients, in 25 kg medium frequency induction Smelting in electric furnace. In order to optimize the cerium content of the alloy, four kinds of tin phosphor bronze flat ingots with different cerium content were made as shown in Table 1. The size of the flat ingots was 18mm×80mm×160mm. The flat ingot was made according to the following rolling annealing process: specimen: thick 18mm flat ingot → homogenized annealing (600℃,3h)→ rolling to thick 13mm→ middle annealing → rolling to thick 6mm→ middle annealing → rolling to thick 2mm→ finished annealing (500℃,1h). Tension samples were taken along the rolling direction of 2.0mm calendered sheet of each alloy. The specimens for metallographic and hardness test were taken from 6mm calendered plates of no. 1, 3 and 4 alloys. The specimens were divided into 4 groups and annealed at 400℃, 500℃, 600℃ and 620℃ for 2h, respectively. The microstructure was observed, and the grain size and hardness were determined. Metallographic samples were taken from the ingot of four kinds of alloys to observe the as-cast microstructure and the microstructure after homogenization annealing.