Abstract
In this study, an investigation is carried out to evaluate and compare the material and physical properties of Grade 5 Titanium alloy (Ti6Al4V G5) samples of three different impeller manufacturers. The study aims to identify the efficient impeller core material from different Ti6Al4V G5 manufacturers. Ultrasonic fatigue test for Ti6Al4V samples of 100 horsepower (hp) centrifugal compressor impeller parts is performed before and after heat treatment. The effect of microstructure on Very High Cycle Fatigue (VHCF) behavior of Ti6Al4V is also analyzed and discussed in detail. Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) observation are carried out to investigate the microstructure of different Ti6Al4V material samples. The dynamic elastic properties are measured by the Impulse Excitation Technique (IET) at room temperature. The fracture behavior of the tensile specimens is analyzed by SEM. Post-heat-treatment analysis of Ti6Al4V is also carried out and presented which affects the grain size of the material sample and thus considerable effect in the mechanical properties. Chemical composition investigation of Ti6Al4V using SEM and Energy Dispersive X-ray Spectroscopy (EDS) also included in this study.
Highlights
The demand for Titanium alloy (Ti6Al4V) dominates in various fields including aerospace, marine, automobile, chemical, and biomedical industries [1,2,3,4,5,6]
Recent studies [18,19] using ultrasonic test systems have shown that many materials including some steels and titanium alloys exhibit a sharp decrease in fatigue strength between very high fatigue lives of 106 and 109 cycles, which is in contrast to the classical concept of fatigue limit
The results summarize the average material properties after repeated measurements in five specimens for each material samples and the values are within the acceptable range, 100–120 GPa [29]
Summary
The demand for Titanium alloy (Ti6Al4V) dominates in various fields including aerospace, marine, automobile, chemical, and biomedical industries [1,2,3,4,5,6] Recent studies [18,19] using ultrasonic test systems have shown that many materials including some steels and titanium alloys exhibit a sharp decrease in fatigue strength between very high fatigue lives of 106 and 109 cycles, which is in contrast to the classical concept of fatigue limit. Ti6Al4V materials are generally cooled by annealing until the solute atoms are completely solid in a single phase by annealing until the β-phase is completely dissolved to prevent diffusion In this state, the alloy has relatively soft and weak properties. Fatigue fracture of the surface is observed with the help stress-versus-cycle fatigue cracks graphs
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