启锻时间对铸锻复合成形2014铝合金组织与性能的影响

Microstructure and Mechanical Properties of 2014 Aluminum Alloy Prepared by Casting-forging Integrated Technology at Different Forging-starting Time

研究了不同的启锻时间对2014铝合金的组织与性能的影响。结果表明,当启锻时间为4~5s时,制件的组织致密,施加的锻压力有效地对铸坯进行了强制补缩;与锻头接近的部位都存在明显的变形组织,随着启锻时间的延长,制件中的晶粒尺寸增大。热处理前后制件的抗拉强度和伸长率随着启锻时间的延长先增大然后减小,接着又增大。未热处理状态下,启锻时间为4s时,其力学性能最高,抗拉强度和伸长率分别为280MPa和8.5%;热处理后,启锻时间为5s时,其力学性能最高,抗拉强度和伸长率分别为380 MPa和6.5%。

Microstructure and mechanical properties of 2014 aluminum alloy prepared by casting-forging integrated technology at varied forging-starting time were investigated.The results show that microstructure of the parts exhibits compaction with forging-starting time of 4~5sas a result of effectively forced feeding by forging force on the castings.The deformation microstructure can be observed in the parts near to the forged head,and the grain size is increased with the increase of forging-starting time.The tensile strength and elongation of the alloy before and after heat-treatment are increased firstly and then decreased,and then increased again.Without heat treatment,the tensile strength and elongation of parts reach 280 MPa and 8.5%,respectively,when forging-start time is 4s,while with heat treatment,they reach 380 MPa and 6.5%,respectively,when forging-start time is 5s.