锻压技术

启锻时间对铸锻成形A356铝合金组织与性能的影响

英文标题：Effect of forging start-up time on microstructure and mechanical properties of

作者：王顺成牛艳萍郑开宏戚文军

单位：广东省工业技术研究院

分类号：

出版年,卷(期):页码：2014,39(1):131-135

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 microstructure 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 microstructure densification 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.

基金项目：

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）

王顺成（1976-），男，博士，高级工程师

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