关键词: Al-Pb合金, 力学性能, 喷射成形SF, 显微组织, 电火花加工, 放电产物, 放电点分布均匀性, 高速摄像机, 钛合金

Abstract: The spray forming process of Al-6.5Pb-4.5Si-Cu-0.5Sn bearing alloy is studied using a spray forming equipment. The microstructure and the mechanical properties of the spray formed steel / Al-Pb composite steel strip is analyzed. It is shown that the microstructure of the spray formed Al-Pb layer consisted of the Al-Si matrix and the homogeneously distribut-ed Pb particles. The refined Pb particles improve the wear-resistant property of the alloy. After a rolling of 50% reduction the bonding strength between the spray formed Al-Pb layer and the steel strip is larger than 50 Mpa. The composite steel / Al-Pb strip may be a good potential material to be used for automotive bearing materials.

Key words: Al-Pb alloy, Mechanical properties, Microstructure, Spray forming, Discharge products, Electric discharge machining, High-speed video camera, Titanium alloy, Uniformity of the discharge point distribution