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基于纳米压入的有限元模拟即正向分析,研究304不锈钢(AISI-304SS)基体对Ti及Cr2种金属薄膜的影响。Ti膜相对于AISI-304SS基体为软膜硬基,Cr膜相对于AISI-304SS基体为硬膜软基。为了能反映实际工况,模拟时,基体与膜均采用幂律强化本构模型,弹塑性性能参数已知,压深与膜厚比(hmax/t)介于0.05与0.5之间,步长为0.05。作为对照,对2种薄膜对应的块状材料以及不锈钢基体均作了相应的模拟。模拟发现,基体对薄膜弹性模量的影响相应于对薄膜硬度的影响更为敏感,软膜硬基易于在压痕周围产生径向裂纹,硬膜软基易于在压痕周围产生环向裂纹。
The effects of 304 stainless steel (AISI-304SS) matrix on Ti and Cr2 metal films were investigated based on the finite element analysis of nanoindentation, ie, forward analysis. The Ti film is a soft film hard substrate relative to the AISI-304SS substrate and the Cr film is a dura soft substrate relative to the AISI-304SS substrate. In order to reflect the actual working conditions, the matrix and the membrane adopt power law to strengthen the constitutive model, the elastic-plastic performance parameters are known, and the ratio of depth to thickness (hmax / t) is between 0.05 and 0.5, Is 0.05. As a control, two types of films corresponding to the bulk material and stainless steel substrate were simulated accordingly. The simulation results show that the influence of matrix on the elastic modulus of the film is more sensitive to the influence on the hardness of the film, the hard film of the soft film is easy to produce radial cracks around the indentation, and the soft film of the hard film tends to generate circumferential cracks around the indentation.