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采用热模拟机对自孕育法制备的2024变形铝合金锭料进行了部分重熔,研究了等温温度对保温处理锭料和未保温处理锭料部分重熔后凝固组织的影响。结果表明,自孕育法制浆可以获得理想的非枝晶组织,未保温处理时组织由大量等轴晶和少量不发达的树枝晶组成,而短时间保温后初生相呈球状均匀分布于基体中且内部无夹裹液相;随着等温温度的增加,一次颗粒和二次颗粒同时发生合并长大与Ostwald熟化,重熔液相先以薄膜形式析出,后逐渐增多成小片区域,为后续二次凝固提供条件;二次初生相依附初生相生长或直接形核长成近球状颗粒,共晶反应的结束标志凝固过程的完成。
The partial remelting of 2024 deformed aluminum alloy ingot prepared by self-inoculation method was carried out by using the thermal simulator. The effect of isothermal temperature on the microstructure of ingot after heat preservation and partial remelting of uninsulated ingot was studied. The results showed that the ideal non-dendritic microstructure could be obtained by self-inoculation pulping method. The structure was composed of a large amount of equiaxed grains and a few underdeveloped dendrites during the non-incubation period, while the primary phases were evenly distributed in the matrix after being incubated for a short time And with no entrapped liquid in the interior. With the increase of isothermal temperature, primary particles and secondary particles coalesce and grow together with Ostwald ripening, and the remelt liquid phase is precipitated in the form of thin film and then gradually increases into small areas for the subsequent two Secondary solidification to provide the conditions; secondary primary dependency attached to the primary phase growth or direct nucleation grow into nearly spherical particles, the end of the eutectic reaction signification of the completion of the solidification process.