Abstract
Surface scratch has significant influence on the fatigue behavior of Ti-5Al-2Zr-4Mo-4Cr. In this paper, fatigue test with three different surface roughness are conducted, test results are recorded, including test data and fracture characteristics. The distribution of test data is analyzed and the fracture characteristics are discussed according to the change of surface roughness. Study of fatigue behavior of Ti-5Al-2Zr-4Mo-4Cr with surface roughness is significant intheoretical and engineering fatigue study.
Highlights
Surface scratch has a significant effect on the fatigue property of metal material [1,2,3], titanium alloy titanium alloy is no exception
The main factor causing the fatigue failure, in such care, should be the surface scratches made in machining process or operating process, which can be quantitatively expressed as the surface roughness
Ra has been widely employed to analyze the effect of surface roughness on the fatigue property for its advantages: First, wide expression range, both the surface micro geometry and profile peak of the surface morphology can be reflected by Ra at the same time; Second, simple detection process, the data acquisition of Ra can be conducted out by ZYGO surface profilometer; Third, the theoretical analysis and calculation results tend to be safe
Summary
Surface scratch has a significant effect on the fatigue property of metal material [1,2,3], titanium alloy titanium alloy is no exception. Ti-5Al-2Zr-4Mo-4Cr is a kind of α-β two phase titanium alloy with β-stable element, known as Tc17 titanium alloy It has been widely applied in the marine field for its excellent mechanical property [4,5]: high strength, good corrosion resistance, low relative density, and good high temperature oxidation resistance. It is necessary to study and clear how the different surface scratches the Tc17 fatigue failure mechanism and fatigue property, avoid the fatigue failure of Tc17 parts in actual working condition. Quite a few studies have been carried out to investigate the effect of surface roughness on fatigue failure and the fatigue property of Tc17 titanium alloy. Some investigations have been carried out to study the fatigue failure behavior of TC17, neither the effect of surface roughness on Tc17 fatigue property, nor the Tc17 fatigue property assessment with the consideration of different surface roughness (Ra and Rz) is studied well. The fatigue life prediction models for Tc17 as a function of Ra and Rz are developed respectively, the comparison between theoretical life and the additional test results is carried out to determine which model is more suitable for fatigue life prediction of Tc17
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