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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Coating Surface Finishing on Fatigue Behavior of C450 Steel CAPVD Coated with (Ti,Cr)N
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Effect of Coating Surface Finishing on Fatigue Behavior of C450 Steel CAPVD Coated with (Ti,Cr)N

机译：涂层表面光洁度对（Ti，Cr）N涂层C450钢CAPVD疲劳行为的影响

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摘要

The present study evaluated the effect of the surface quality of a custom 450 stainless steel substrate coated with a (Ti,Cr)N nanolayer by cathodic arc physical vapor deposition on fatigue performance in air and in a 3.5% NaCl solution. Scanning electron microscopy was used to locate crack origin sites and characterize the coating. X-ray diffraction was used to analyze the phase formation and measurement of residual stress in the coating. The results showed that the determined in plane residual stress is compressive, with amount of GPa. Chemical mechanical polishing was used to decrease the coating surface roughness (R (a) from 0.35 to 0.07 A mu m). This significantly decreased the area having a high stress concentration and delayed the appearance of micro-cracks in the coating during fatigue testing. The results showed that when the material is tested under axial loading at a maximum alternating stress of 555 to 930 MPa, the fatigue strength of coated specimens with polished surfaces increased 10.6% in air and 26.7% in NaCl solution over the coated specimens with normal surfaces. Post-treatment of the coating increased the fatigue strength 3.5% in air and 10.1% in NaCl solution over the uncoated specimens and the weakness of CAPVD coating was eliminated in the field of fatigue.
机译：本研究评估了通过阴极电弧物理气相沉积法涂覆有（Ti，Cr）N纳米层的定制450不锈钢基材的表面质量对空气和3.5％NaCl溶液中疲劳性能的影响。使用扫描电子显微镜来定位裂纹的起源位置并表征涂层。 X射线衍射用于分析涂层中的相形成和残余应力的测量。结果表明，确定的平面残余应力是压缩的，具有GPa量。使用化学机械抛光将涂层表面粗糙度（R（a）从0.35降至0.07 Aμm）。这显着减小了具有高应力集中的区域，并延迟了疲劳测试期间涂层中微裂纹的出现。结果表明，当材料在轴向载荷下承受的最大交变应力为555至930 MPa时，与具有正常表面的涂层试样相比，具有抛光表面的涂层试样在空气中的疲劳强度提高了10.6％，在NaCl溶液中的疲劳强度提高了26.7％ 。涂层的后处理相对于未涂层的样品，在空气中的疲劳强度提高了3.5％，在NaCl溶液中的疲劳强度提高了10.1％，并且消除了CAPVD涂层在疲劳领域中的弱点。

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