启锻时间对铸锻成形A356铝合金组织与性能的影响  

Effect of forging start-up time on microstructure and mechanical properties of A356 aluminum alloy prepared by casting-forging integrated technology

作　　者：王顺成[1] 牛艳萍[2] 郑开宏[1] 戚文军[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)金属加工与成型技术研究所,广东广州510650 [2]广东省工业技术研究院(广州有色金属研究院)分析测试中心,广东广州510650

出　　处：《锻压技术》2014年第1期131-135,共5页Forging & Stamping Technology

基　　金：国家科技部科研院所技术开发专项项目(2013EG115006);广东省教育部科技部产学研结合项目(2012B090600051)

摘　　要：采用铸锻一体化成形技术制备A356铝合金汽车制动器卡钳,研究了启锻时间对卡钳的组织与力学性能的影响。结果表明,随着启锻时间的延长,锻压对模腔内凝固合金的强制性补缩效果越好,显微组织塑性变形越明显,卡钳的抗拉强度和伸长率越高。当启锻时间大于3 s时,锻压工艺能够完全压实愈合收缩缩孔和裂纹,使显微组织产生明显的塑性变形,破碎细化枝晶晶粒。锻压后A356铝合金汽车制动器卡钳的抗拉强度和伸长率分别为318.5 MPa和6.6%,比未锻压卡钳的抗拉强度和伸长率分别提高了19.9%和34.7%。The casting-forging integrated technology was adopted to prepare A356 aluminum alloy automobile brake calipers. The effects of forging start-up time on mierostrueture and mechanical properties of A356 aluminum alloy automobile brake calipers were studied. Results show that with the prolonging of forging start-up time, the ultimate tensile strength and elongation of A356 aluminum alloy automobile brake calipers are increasing due to the forced feeding and microstrueture densifieation by forging. When the forging start-up time is more than 3 s, the shrinkage cavities and cracks within automobile brake calipers can be removed and the dendrite grains can be broken to fine grains. The ultimate tensile strength and elongation of A356 aluminum alloy automobile brake calipers with forging are 318.5 MPa and 6. 6% , which are improved by 19. 9% and 34. 7% compared with that of A356 aluminum alloy automobile brake calipers without forging.

关 键 词：铸锻一体化成形 启锻时间 A356铝合金 汽车制动器卡钳 

分 类 号：TG319[金属学及工艺—金属压力加工]