高速钢刀具上氮化钛硬质涂层残余应力分析

摘要：表面涂层（或薄膜）作为表面技术及复合表面技术中的重要一种，在现代材料设计和应用中发挥着愈来愈重要的作用。为了更有效地发挥表面涂层技术的优势，在确定要应用某种材料之前，需要充分了解其基本力学性能。因为涂层的基本力学性能是材料设计的依据，对材料的性能、可靠性和使用寿命有很大影响。从理论和试验两个环节研究了TiN涂层/金属基体系统的残余应力。主要结论：涂层厚度对其残余应力有很大影响。当涂层厚度从10μm变化到50μm时，TiN涂层总残余应力分布在-2.19～ -1.53GPa之间；热应力分布在-1.62～ -1.24GPa 之间。当膜基比ξ<0.1时，总残余应力随 的增加呈非线性减少；当ξ=0.1时，该值达到最大值2.19GPa。
关键词：TiN涂层  高速钢  残余应力  曲率法  有限元法
Curvature Testing and Finite Element Analysis for the Residual Stress in TiN Coatings on High Speed Steel
 

  Abstract: As one of important surface technologies and composite surface technologies, the coatings (or films) technologies played very important roles in modern materials designs and industry application. It is vital to study the basic mechanical performances of coatings, because these mechanical performances are helpful to design and to apply materials, they also have great influence on the materials performances, reliability, and service life. TiN coatings/metals substrates systems were measured in this paper. Residual stresses were studied in theory and experiment, respectively. The main conclusions are shown as following: TiN coating thickness affects greatly on residual stresses. When the coating thickness changes from 10 μm to 50μ m, the total residual stresses of TiN coating change from -2.19 Gpa to -1.53Gpa, tthe thermal stresses from -1.62Gpa to -1.24Gpa. The TiN residual stresses decrease nonlinearly with the increasing coating thickness, when the ratio of TiN coating thickness to substrate thickness ξ is 0.1,the total residual stresses reach to the maximum value -2.19Gpa.
Key words: TiN coatings  High speed steel  Residual stress  Curvature method  Finite dlement method

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