喷射沉积颗粒梯度增强铝合金活塞的锻压工艺

发布时间：2018-03-26 14:43

  本文选题：铝合金活塞　切入点：锻压工艺　出处：《湖南大学学报(自然科学版)》2017年06期

【摘要】：提出了采用喷射沉积高硅铝合金碳化硅梯度增强复合材料,进行墩挤锻压制备汽车发动机活塞的方法,设计了该方法所用的活塞锻压模具,并研究了变形速率、始锻温度、坯料保温时间等工艺参数对梯度增强高硅铝合金活塞锻件组织及力学性能的影响.结果表明:所提出的方法可以制备出碳化硅梯度分布的铝合金活塞,活塞壁部外表面沿裙部末端至环槽区碳化硅分布为3.7%~13.6%;且最佳的锻压工艺参数为:变形速率为0.05s~(-1),始锻温度为465℃,坯料保温时间为2h.活塞取样并经固溶+时效热处理后,其性能指标为抗拉强度达382MPa,延伸率为6.0%.
[Abstract]:In this paper, a method of preparing automobile engine piston by extrusion forging with silicon carbide gradient reinforced composite material of high silicon aluminum alloy by spray deposition is presented. The piston forging die used in this method is designed, and the deformation rate, starting forging temperature and deformation rate are studied. The effect of heat preservation time on the microstructure and mechanical properties of gradient-reinforced high-silicon aluminum alloy piston forgings is studied. The results show that the aluminum alloy piston with gradient distribution of silicon carbide can be prepared by the proposed method. The distribution of sic from the end of the skirt to the ring groove is 3.713.6.The optimum forging process parameters are as follows: the deformation rate is 0.05s / L, the initial forging temperature is 465 鈩，

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