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用激光表面合金化的方法加入Ni、Cr等成分在铝合金基体材料表面形成具有良好耐磨性能的合金化层。实验首先将合金粉末调和后涂于试样表面,用CO_2激光以不同功率、不同的光斑移动速度对徐层进行激光合金化处理。分析结果表明,工艺参数极大地影响合金化效果;可得到显微硬度达1400HV的高度硬化层;选用合适的功率、光斑运动速度及预涂层厚度可得到单道轨迹、多道搭接及整个试样表面的无气孔、裂纹缺陷的组织细密的合金化层;层内主要强化相为AlNi和多种Al/Ni金属间化合物。最终得到的全试样表面合金化层的硬度比基体高60—100HV,耐磨性比基材提高3—5倍。
By laser surface alloying method adding Ni, Cr and other components in the aluminum alloy substrate surface with good wear resistance of the alloy layer. In the experiment, the alloy powder is first coated on the surface of the sample after being reconciled, and the laser cladding layer of the Xu layer is treated with a CO 2 laser at different powers and different spot moving speeds. The analysis results show that the process parameters greatly affect the alloying effect; a highly hardened layer with a microhardness of 1400 HV can be obtained; single track, multi lashed and the whole can be obtained by selecting appropriate power, spot moving speed and precoating thickness The surface of the sample has no pores and a cracked fine alloyed layer. The main strengthening phase in the layer is AlNi and various Al / Ni intermetallic compounds. The resulting specimen surface alloying layer hardness than the substrate 60-100HV, 3-5 times higher wear resistance than the substrate.