Mold Copper Alloy Material Organization And Robustness Study

In recent years, a new type of high - aluminium bronze die had been imported to replace some iron-based dies, such as 35CrMo et. In heat-exchanger production, the new aluminium bronze die material processes some super properties, such as high strength, low friction coefficient and wear-resistance. It belongs to excellent die material in the field of drawing stainless steel. In order to realize localization of manufacture of high-aluminium bronze die material and decrease cost of copper alloy die material, the ordinary smelting process was used by referring to composition of imported high-aluminium bronze. In this paper, microstructure and propertied were studied so that the best microstructure of die material can be obtained.Effect of solid solution and aging treatment on microstructure and properties of multi-aluminum bronze is studied by using optical microscope, SEM, XRD and mechanical property testing. The results show that the high-aluminum grain size increases and r2 phase K phase have been soluted with the increase of solution treatment temperature, and the thermal brittle at high solution temperature results from the segregation of inclusions at grain boundary; with increase of aging temperature, the strength phases precipitate from partly to wholly and B phase will transform into r2+a eutectoid which leads to mechanical properties decreasing . distributing of K phase and r2 phase in high-strength B' phase of high-aluminum bronze can be obtained by 950C X 2h oil-quenching and 500CX5h aging treatment. So comprehensive mechanical properties of the high-aluminum bronze are higher under such heat treatment technique.