Effect of heat- and cryogenic treatments on 12% tin bronze

Jurči Peter - Slovak Technik University of Trnava (Slovak Republik)

In the present work, CuSn12 bronze was subjected to various heat treatments including solutioning, artificial aging and cryogenic treatment. It was found that the as-received bronze contained the α – solid solution and the δ – eutectoid (mixture of α – and δ – phases). Solutioning induced complete dissolution of the δ – phase. Subsequent artificial aging evoked probably some changes in the microstructure, however, they are at nano-level. Cryogenic treatment resulted in substantial increase in the number of fine deformation twins inside the α – solid solution grains. The hardness and yield strength were decreased by all of the applied treatments while opposite effects were recorded for the ductility and impact toughness. However, slight but undisputable effect of aging on all the mechanical properties (increase in hardness, yield strength but decrease in ductility and toughness) was determined.

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