Study on the Influence of 2A14 Aluminium Alloy Thick Plate Microstructure on Chemical Milling Quality
In order to improve the chemical milling quality of 2A14 aluminium alloy thick plate,the microstructure of the plate were analysed using testing equipments such as electron microscopy(OM),scanning electron microscopy(SEM),energy dispersive spec-trometer(EDS),etc.It was determined that the point pits after plate chemical milling were caused by large-size compounds and string compounds.The formation of honeycombs was due to the large size of the compounds during the chemical milling process,which de-posited at the bottom of the grooves after detachment,forming uneven honeycomb corrosion.The roughness of the chemical milling surface was caused by the aggregation of large-size compounds.Due to the presence of compound phases,pits could occur during the corrosion(chemical milling)process,and the size of the pits was directly proportional to the size and degree of aggregation of the com-pound phase.Finally,the Si element mass fraction was controlled to around 0.90%,the Fe element mass fraction was controlled to around 0.35%,and the amount of online refiners was increased to achieve composition optimization.At the same time,optimizing the homogenization process of the ingot,appropriately increasing the homogenization soaking temperature of the ingot,reducing the ho-mogenization soaking time can improve the microstructure,and solve the chemical milling quality problems.
chemical millinglarge-size compoundsstring compoundshomogenizing
万方数据
维普
