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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effects of Gas Nitriding on Fatigue Behavior in Titanium and Titanium Alloys
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The Effects of Gas Nitriding on Fatigue Behavior in Titanium and Titanium Alloys

机译：气体氮化对钛及钛合金疲劳行为的影响

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摘要

Fatigue behavior has been studied on gas-nitrided smooth specimens of commercial pure titanium, an al-pha/beta Ti-6Al-4V alloy, and a beta Ti-15Mo-5Zr-3Al alloy under rotating bending, and the obtained re-sults were compared with the fatigue behavior of annealed or untreated specimens. It was found that the role of the nitrided layer on fatigue behavior depended on the strength of the materials. Fatigue strength was increased by nitriding in pure titanium, while it was decreased in the Ti-6Al-4V and Ti-15Mo-5Zr-3Al alloys. Based on detailed observations of fatigue crack initiation, growth, and fracture surfaces, the improvement and the reduction in fatigue strength by nitriding in pure titanium and both alloys were primarily attributed to enhanced crack initiation resistance and to premature crack initiation of the ni-trided layer, respectively.
机译：研究了在商业弯曲的纯钛，α-β/βTi-6Al-4V合金和β-Ti-15Mo-5Zr-3Al合金的气体渗氮光滑试样在旋转弯曲下的疲劳行为，并获得了结果将其与退火或未处理样品的疲劳行为进行比较。发现氮化层对疲劳行为的作用取决于材料的强度。通过在纯钛中氮化可提高疲劳强度，而在Ti-6Al-4V和Ti-15Mo-5Zr-3Al合金中可降低疲劳强度。根据对疲劳裂纹萌生，扩展和断裂表面的详细观察，纯钛和两种合金中氮化处理引起的疲劳强度的提高和降低主要归因于增强的抗裂纹萌生性和镍合金层的过早裂纹萌生。 ， 分别。

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