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灰铸铁作为汽车制动盘的主要制造材料,其表面通常需要提供高而稳定的摩擦系数,但是制动过程中摩擦产生的高温会导致摩擦系数骤降。在灰铸铁动态应变时效(DSA)温度范围内,采用激光喷丸(LP)对灰铸铁表面进行微造型,造型参数分别为不同的深径比和面密度。室温下通过摩擦磨损试验研究了造型样品的几何参数对于材料表面摩擦系数的影响,挑选最佳参数进行高温摩擦试验并讨论了磨损机理。结果表明:温度辅助的激光微造型技术能大幅提高灰铸铁表面的摩擦学性能,造型试样的抗磨损性也优于未造型试样。
Gray cast iron, as the main manufacturing material of automotive brake discs, usually requires a high and stable coefficient of friction on its surface, but the high temperature generated by friction during braking can cause the coefficient of friction to plummet. In the gray cast iron dynamic strain aging (DSA) temperature range, the surface of gray cast iron was micro-formed by laser shot peening (LP) with different depth-to-diameter ratio and area density. At room temperature, the influence of the geometric parameters of the sample on the surface friction coefficient was studied by means of friction and wear test. The best parameters were selected for high temperature friction test and the wear mechanism was discussed. The results show that the temperature-assisted laser micro-molding technology can greatly improve the tribological properties of the surface of gray cast iron, and the wear resistance of the shaped sample is also better than the non-shaped sample.