Impact of Preparation of Titanium Alloys on Their Abrasive Water Jet Machining.

Adam Štefek,Martin Tyč

doi:10.3390/ma14247768

Abstract

Several titanium alloys, i.e., grade 2 Ti, Ti6Al4V and NiTi alloy, prepared by selected deformation procedures were subjected to abrasive water jet (AWJ) cutting and subsequently analysed. The study describes samples’ preparations and respective material structures. The impact of deformation processing of the selected alloys on the declination angle during cutting, and the results of measurements of surface wall quality performed for the selected samples at the Department of Physics of Faculty of Electrical Engineering and Computer Science at VŠB–Technical University of Ostrava, are presented and discussed, as are also the influences of structural features of the processed titanium alloys on surface qualities of the investigated samples. The results showed that the highest resistance to AWJ machining exhibited the Ti6Al4V alloy prepared by forward extrusion. Its declination angle (recalculated to the thickness 10 mm to compare all the studied samples) was 12.33° at the traverse speed of 100 mm/min, pumping pressure of 380 MPa, and abrasive mass flow rate of 250 g/min.

Highlights

Titanium is one of the high-tech materials featuring high corrosion resistance, low density and elasticity modulus, low thermal conductivity and high strength [1]
Due to the fact that the initial conditions were different for the individual cuts, the theoretical model by Hlaváč presented in [38,39], which was used in this study, was applied after the declination angles were recalculated for the ideal thickness of 10 mm for all the samples, and the traverse speeds were unified to 100 mm/min
As regards the CPTi2 material, the comparison of samples 1a and 1b, prepared from a CPTi2 billet via room-temperature equal channel angular pressing (ECAP), and room-temperature ECAP followed by 10 years of natural aging, respectively, provides the basis to acquire the “rheology factor” for this material

Summary

Introduction

Titanium is one of the high-tech materials featuring high corrosion resistance, low density and elasticity modulus, low thermal conductivity and high strength [1]. Due to the high corrosion resistance and low thermal conductivity, Ti has promising applicability in the aerospace industry as it can be used to protect plastic composite cores from heat and moisture [5]. The severe plastic deformation (SPD) method of equal channel angular pressing (ECAP) was used to alter the properties of CP (commercial purity) Ti [10,11,12], as well as to manufacture ultra-fine grained samples from Ti6Al4V [13,14], NiTi alloys [15,16] or various biocompatible Ti-based alloys [17,18]

Methods

Results

Discussion

Conclusion