Abstract
Abstract This paper compares the creep behavior of Ti-6Al-4V alloy after different surface treatments, the plasma nitriding using Plasma Enhanced Chemical Vapor Deposition (PECVD), and the deposition of SiC thin films with Cr interlayer using High Power Impulse Magnetron Sputtering (HiPIMS). A microstructural characterization was performed with Scanning Electron Microscopy (SEM), Scanning and Transmission Electron Microscopy (STEM), and Energy Dispersive Spectroscopy (EDS) techniques. The creep test was performed at a constant load from 500 to 600 °C and 125 to 319 MPa, and a fractographic analysis was performed. The EDS analysis of the plasma nitrided layer indicated the nitrogen presence of the compounds TiN and Ti2N and an increase in the iron concentration. Creep test results in both conditions indicated an increase in the creep resistance. Plasma nitrided condition indicated the lowest creep rate and lesser elongation, making it the most suitable in applications that require a low dimensional distortion.
Highlights
Ti-6Al-4V alloy is one of the most widely used titanium alloys
Surface treatments of plasma nitriding[9,13] and the application of Cr interlayer silicon carbide (SiC) film deposited by HiPIMS14,15 have been studied by this research group and the objective of this work is to verify under what conditions each one of them may be considered more appropriate
This work about the effects of plasma nitriding and SiC coating with Cr interlayer treatments applied in the surface of the Ti-6Al-4V alloy led to the conclusions below:
Summary
Ti-6Al-4V alloy is one of the most widely used titanium alloys. It is widely used in the aeronautical industry due to its good creep resistance[1,2,3]. Titanium suffers from oxidation and for high-temperature applications a surface treatment, that acts as an oxygen diffusion barrier, is indicated to maintain good mechanical strength[2,4]. Comparing to the other microstructures, the Widmanstätten microstructure previously studied[8,9,10,11] had the highest creep resistance in Ti-6Al-4V alloy. This fact can be attributed to the α/β interfaces that act as obstacles to the dislocations slip and the larger grain size that reduces the grain boundary sliding[12]
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