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首页> 外文期刊>Journal of Materials Science >Interfacial mechanical properties of TiN coating on steels by indentation
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Interfacial mechanical properties of TiN coating on steels by indentation

机译：压痕在钢上TiN涂层的界面力学性能

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The elastic theory of indentation on nitride films/steel systems showed distribution of stresses (shear stress, radial stress and circumferential stress) near the interface and in the film. The difference in values for each stress along the distance to the load center increased with increasing Poisson's ratios of steels. The shear stresses (sigma(rz)) had the maximum value at a distance to the load center and the difference became more significant with increasing Poisson's ratios of steel substrates ( from 0.2-0.3 of Poisson's ratio for high-speed steels to 0.3-0.35 for stainless steels), which accounted for the large amount of cracks inside the indent cavity of nitride films/stainless steel in spite of the smoothness outside the cavity. The calculation of sigma(r) and sigma(z) showed that the differences in nitride films/steel stress increased with increasing Poisson's ratios of steels, which also facilitated the formation of ring cracks in the film of nitride films/stainless steel composite. Indentation examination revealed the large amount of cracks inside the indent cavity of nitride film/stainless steel but smooth surface outside the cavity. These were formed under the high sinusoidal shear stress and circumferential radial stress due to the higher Poisson's ratio of stainless steel and the plastic deformation due to the lower yield stress of stainless steel (SS), which induced more local residual stresses, whereas some cracks or spalling observed around the cavity and no cracks inside the cavity were attributed to the edge effect when the conical indenter strained the surface downward for nitride film/high-speed steel (HSS) system.
机译：氮化物膜/钢系统上的压痕弹性理论表明，界面附近和膜中的应力分布（剪切应力，径向应力和周向应力）。沿载荷中心距离的每个应力值的差异随着钢的泊松比的增加而增加。剪切应力（sigma（rz））在距载荷中心一定距离处具有最大值，并且随着钢基底的泊松比增加（从高速钢的泊松比的0.2-0.3到0.3-0.35），差异变得更大。对于不锈钢而言），尽管氮化硅膜/不锈钢的凹腔内表面光滑，但仍导致大量裂纹产生。 σ（r）和σ（z）的计算表明，氮化物膜/钢应力的差异随钢的泊松比的增加而增加，这也促进了氮化物膜/不锈钢复合材料膜中环裂纹的形成。压痕检查显示氮化膜/不锈钢的压痕腔内有大量裂纹，但腔外表面光滑。它们是在较高的正弦波剪切应力和周向径向应力下形成的，这是由于不锈钢的泊松比较高，而塑性变形则是由于不锈钢（SS）的屈服应力较低而引起的，从而引起更多的局部残余应力，而某些裂纹或对于氮化物膜/高速钢（HSS）系统，当锥形压头使表面向下应变时，在孔洞周围观察到的剥落现象以及孔洞内部没有裂纹归因于边缘效应。

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