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在相同的切削条件下对工业纯钛(TA2)和钛合金(TC4)进行切削试验,获得了不同形态的切屑.从价电子结构角度研究不同合金元素对绝热剪切敏感性的作用机理.研究结果表明,绝热剪切敏感性与界面电子密度和晶格电子密度有关,界面电子密度越大,结合强度越大,绝热剪切敏感性越高,晶格电子密度小,热导率低,绝热剪切敏感性亦高.TA2界面电子密度小,晶格电子密度大,绝热剪切敏感性低,切屑形态近似带状,TC4由于加入了合金元素Al和V,产生异相界面,界面电子密度增大,同时降低了晶格电子密度,使TC4有较高的绝热剪切敏感性,产生由绝热剪切带均匀间隔的锯齿形切屑.从价电子结构角度研究具体合金元素对绝热剪切敏感性的影响规律,可从一定程度上预测切屑形态,为设计、选择具有不同切削性能的材料,优化工艺参数提供参考依据.
In the same cutting conditions of industrial pure titanium (TA2) and titanium alloy (TC4) cutting test obtained different forms of chip.From the valence electron structure study of different alloying elements on the adiabatic shear susceptibility mechanism.Study The results show that the adiabatic shearing sensitivity is related to the interfacial electron density and lattice electron density. The larger the interfacial electron density, the greater the bonding strength, the higher the adiabatic shearing sensitivity, the smaller the lattice electron density, the lower the thermal conductivity, Shear sensitivity is also high.TA2 interface electron density is small, lattice electron density, adiabatic shear sensitivity is low, the chip shape is approximately ribbon shape, TC4 due to the addition of alloying elements Al and V, resulting in heterogeneous interface, the interface electron density Increases, and at the same time reduces the lattice electron density, making TC4 have a higher adiabatic shear sensitivity, resulting in serrated chip evenly spaced by adiabatic shear bands. From the viewpoint of valence electron structure, the specific alloying elements are sensitive to adiabatic shear The law of the impact of the nature of the chip can be predicted to some extent, for the design, selection of materials with different cutting performance, optimize the process parameters provide a reference.