| By means of mechanical property testing, microhardness tests, conductivity testing, optical microscopy, SEM and transmission electron microscopy (TEM) effect of quenching agent on mechanical properties, exfoliation corrosion, intergranular corrosion and microscopic structure resistance of 2519A alloy was investigated in this paper. The results show that:(1)Artificial aging process of alloy which is processed by different quenching agents can be divided into three stages, under-aging; peak-aging; over-aging. Along with the reduction of the agents quenching ability, the time which is spent to reaching ageing-peak during artificial ageing process is reduced, while the peak hardness reduced. Alloy with pre-deformation has higher hardness than that without pre-deformation. Quenched in pre-deformation state in 20℃water,the peak-hardness was highest.(2) During aging process, as increasing of aging time, the electrical conductivity of the alloy increases gradually. The conductivity of alloy with pre-deformation treatment changes obviously than that without pre-deformation treatment. The alloy quenched in air has the highest conductivity. It is up to 21.3IACS%.(3) In different quenching agents, the alloy which is processed in T8 state has higher intensity than that which is processed in T6 state. Quenched in 20℃water in T8 state , the tensile strength is maximum; quenched in air is minimum.(4) In different quenching agents, the alloy with pre-deformation treatment has better resistance intergranular corrosion and exfoliation corrosion than that without pre-deformation treatment. Resistance intergranular and exfoliation corrosion of alloys which quenched in 20℃water are best and quenched in air are worst. |
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