Abstract
The warm sheet cylindrical deep drawing experiment of aluminum alloy was carried out and macro-mechanical properties and microstructure evolution of hydro-formed cups with different cooling medium were analyzed, which aimed to investigate the effects of different types of cooling on mechanical properties and microstructure of cylindrical cups hydro-formed by warm Hydro-mechanical Deep Drawing (HDD). Results show that, under the condition of warm hydroforming, the mechanical properties such as yield stress and ultimate strength were influenced very little by air or water cooling. Grain coarsening of these hydro-formed cups can be inhibited to a certain extent with subsequent rapid water cooling. Moreover, it shows that the processing with warm sheet hydroforming and subsequent rapid cooling of 7075-O aluminum alloy has a positive significance in maintaining the stability of macro mechanical properties and inhibiting the degradation of the microstructure of materials.
Highlights
IntroductionWarm/hot sheet hydroforming has prominent advantages in improving the forming limit due to combining the advantages of both cold sheet hydroforming and warm sheet forming [1,2]
Warm/hot sheet hydroforming has prominent advantages in improving the forming limit due to combining the advantages of both cold sheet hydroforming and warm sheet forming [1,2].Since temperatures and fluid pressures can lead to more formability than by using cold sheet hydroforming or warm sheet forming, a warm/hot sheet hydroforming process is suitable to form the thin-wall structural parts with complex surfaces of hard-to-form materials at Room Temperature (RT), which can solve the manufacturing problems in hard shaping or hard integral shaping using conventional forming methods [3,4]
In order to observe the influence of different types of cooling on mechanical properties of cylindrical cups after being formed by warm/hot sheet Hydro-mechanical Deep Drawing (HDD), it was necessary to carry out the uniaxial tension test, which was conducted using the electro-hydraulic servo tension test machine
Summary
Warm/hot sheet hydroforming has prominent advantages in improving the forming limit due to combining the advantages of both cold sheet hydroforming and warm sheet forming [1,2]. The hard-to-form materials, which cannot be formed using a traditional forming method, can be formed using warm/hot sheet hydroforming with subsequent rapid cooling to proceed incomplete solution strengthening. It can maintain the stability of macro-mechanical properties and inhibit the degradation of the microstructure of materials to a certain extent. Considering that the cylindrical cups HDD experiment is a classic basic research method [13,14], it was used to research the effect of the process of warm/hot sheet hydroforming with subsequent rapid cooling on mechanical properties and microstructure evolution of the cups, which were formed by warm/hot sheet HDD [15,16]. The results can promote the application process of warm/hot sheet hydroforming technology effectively in the field of aerospace
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