不同冷却速度对铝合金锻件组织与性能的影响  

Effect of different cooling rates on the microstructure and properties of aluminum alloy forgings

作　　者：石芬[1] SHI fen(Xi'an Aeronautical Vocational and Technical College,Xi'an 710089,Shaanxi,China)

机构地区：[1]西安航空职业技术学院,陕西西安710089

出　　处：《金属功能材料》2023年第6期144-150,共7页Metallic Functional Materials

摘　　要：为探究不同冷却速度对AlSi7Mg铝合金锻件组织与性能的影响,用半连续铸造扁锭,连续铸造AlSi7Mg铝合金,过程中使用1.0℃/s~21℃/s内不同的冷却速度对其进行锻造,观察锻件的组织与性能。研究结果表明,随着冷却速度的增加,AlSi7Mg铝合金锻件的孔隙率会先减小后增加,当在12℃/s时,其孔隙率最低,达到了0.251%,此时铝合金的组织最为紧密,组织结构致密性最好;AlSi7Mg铝合金锻件的拉伸强度性能会先增加,当达到7.5℃/s后保持不变,拉伸强度维持在280 MPa左右。冷却速度为12℃/s时,AlSi7Mg铝合金锻件的孔隙率最小,组织致密性最好,同时拉伸性能也较好。To investigate the effect of different cooling rates on the microstructure and properties of AlSi7Mg aluminum alloy forgings,semi continuous casting of flat ingots and continuous casting of AlSi7Mg aluminum alloy were used.During the process,different temperatures were used for forging,and the microstructure and properties of the forgings were observed.Results show that with the increase of cooling rate,the porosity of AlSi7Mg aluminum alloy forgings will first decrease and then increase.At 12℃/s,the porosity is the lowest,reaching 0.251%.At this time,the microstructure of the aluminum alloy is the most compact and the structural density is the best;The tensile strength performance of AlSi7Mg aluminum alloy forgings will first increase and then remain unchanged,with the highest tensile strength maintained at around 280 MPa.With a cooling rate of 12℃/s,AlSi7Mg aluminum alloy forgings have the smallest porosity,the best microstructure density,and good tensile properties.

关 键 词：冷却速度 铝合金锻件组织 铝合金锻件性能 AlSi7Mg铝合金 孔隙率 

分 类 号：TG319[金属学及工艺—金属压力加工]