论文部分内容阅读
研究流变压铸工艺参数浇注温度、振动频率和蛇形通道弯道数量对Al-30%Si合金的显微组织和力学性能的影响。流变压铸过程中的半固态Al-30%Si合金浆料采用振动蛇形通道浇注工艺制备。实验结果表明:浇注温度、振动频率和通道数量对Al-30%Si合金显微组织和力学性能的影响较大。在浇注温度为850°C、通道弯道数量为12和振动频率为80 Hz的条件下,流变压铸工艺制备的样品组织的初生硅晶粒被细化成平均粒径约为24.6μm的块状颗粒;此外,流变压铸样品的抗拉强度、伸长率和硬度分别为296 MPa、0.87%和HB 155。因此,振动蛇形通道浇注工艺能有效地细化组织中的初生Si晶粒。初生Si晶粒的细化是流变压铸样品力学性能改善的主要原因。
The effects of pouring temperature, vibration frequency and the number of bends of serpentine channels on the microstructure and mechanical properties of Al-30% Si alloy were investigated. The semi-solid Al-30% Si alloy slurry in rheological die-casting process was prepared by vibrating serpentine channel casting. The experimental results show that the pouring temperature, vibration frequency and the number of channels have great influence on the microstructure and mechanical properties of Al-30% Si alloy. Under the conditions of pouring temperature of 850 ° C, the number of channel bends of 12 and the vibration frequency of 80 Hz, the primary silicon grains of the sample prepared by the rheological die-casting process are refined into lumps having an average particle diameter of about 24.6 μm In addition, the tensile strength, elongation and hardness of rheo-diecasting samples were 296 MPa, 0.87% and HB 155, respectively. Therefore, the vibration of the serpentine channel casting process can effectively refine the primary Si grains in the organization. The refinement of primary Si grains is the main reason for the improvement of the mechanical properties of rheo-diecasting samples.