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首页> 外文OA文献 >Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying
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Fatigue behavior of a structural steel coated with a WC–10Co–4Cr/Colmonoy 88 deposit by HVOF thermal spraying

机译：HVOF热喷涂涂覆WC-10Co-4Cr / Colmonoy 88镀层的结构钢的疲劳行为

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摘要

The fatigue behavior of a SAE 4340 steel, coated with a 50% WC–10Co–4Cr/50% Colmonoy 88 deposit, by high velocity oxygen fuel (HVOF) thermal spray, has been investigated. The change in the maximum alternating stress with the number of cycles to fracture has been described by means of the relationship advanced by Stromeyer. A fractographic analysis has been carried out on some representative fracture surfaces, by means of scanning electron microscopy (SEM) techniques. The mechanical properties of the coating were characterized by means of nanoindentation tests. The results indicate that the coating is highly heterogeneous. Its deposition gives rise to a decrease in the fatigue strength of the substrate of ∼ 30%, in comparison with the uncoated substrate. The decrease in fatigue strength is due to the presence of stress concentrators at the substrate–coating interface, as well as the intrinsic characteristics of the coating.
机译：已经研究了通过高速氧气燃料（HVOF）热喷涂涂覆了50％WC-10Co-4Cr / 50％Colmonoy 88镀层的SAE 4340钢的疲劳性能。最大变形应力随断裂循环数的变化已通过Stromeyer推进的关系进行了描述。借助于扫描电子显微镜（SEM）技术已经在一些代表性的断裂表面上进行了形貌分析。通过纳米压痕测试表征了涂层的机械性能。结果表明涂层是高度不均匀的。与未涂覆的基材相比，它的沉积使基材的疲劳强度降低了约30％。疲劳强度的降低是由于在基体-涂层界面处存在应力集中器，以及涂层的固有特性。

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