Effect of pre-forging on microstructure and properties of 2A70 aluminum alloy forgings
In order to obtain high-performance 2A70 aluminum alloy forgings,the micro-structure and mechanical properties of 2A70 aluminum alloy forgings after forging+heat treatment and pre-forging+forging+heat treatment were studied.The microstructure of 2A70 aluminum alloy forgings after treatment were observed under GX51 metallography mi-croscope and their mechanical properties were tested on electronic universal test machine.The results show that the properties of forging+heat-treated 2A70 aluminum alloy forgings meet the design requirements of Rm ≥410 MPa,Rp0.2 ≥ 350 MPa,no burnt microstructure and grain size not less than Lv.4,but does not meet the design requirements of A ≥8％.The performance of 2A70 aluminum alloy forgings modified by pre-forging+forging+heat treat-ment meets all design requirements of Rm ≥410 MPa,Rp0.2 ≥350 MPa,A ≥8％,no burnt microstructure and grain size not less than Lv4.The elongation after fracture of 2A70 alumi-num alloy forgings can be improved by adding pre-forging before forging,and the comprehen-sive performance is excellent,which meets the design requirements.
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