Abstract
This work deals with the application of the Conform SPD (Severe Plastic Deformation) continuous extrusion process for ultrafine to nanostructured pure titanium production. The process has been derived from the Equal Channel Angular Pressing (ECAP) technique but, unlike ECAP, it offers continuous production of high-strength wire. This study describes the Conform SPD process combined with subsequent cold working (rotary swaging technique), its potential for commercial application, and the properties of high-strength wires of pure titanium. High-strength wire of titanium Grade 4 is the product. Titanium Grade 4 reaches ultimate strengths up to 1320 MPa. This value is more than twice the ultimate strength of the unprocessed material. The typical grain size upon processing ranges from 200 to 500 nm. Process development supported by FEM analysis together with detailed microstructure characterization accompanied by mechanical properties investigation is presented.
Highlights
IntroductionA lot of attention has been paid to the study of the material phenomena called
In recent years, a lot of attention has been paid to the study of the material phenomena calledSevere Plastic Deformation (SPD) [1,2]
Rotary swaging was performed on as-received wire and on a wire after one and three Conform SPD passes at ambient temperature
Summary
A lot of attention has been paid to the study of the material phenomena called. FHT, theforming methodprocess; has beenand modified in order toSPD refine the structure order to refine the structure during the Conform This Conform SPD significantly improved the final mechanical properties [10,11,15]. SPD processes are usually applied in a multi-pass process, which means the grain applied in is a multi-pass means the grain structure gradually refined with the increasing structure gradually process, refined which with the increasing number of ispasses [18,19]. Another method is to combine the process with cold working. [20,21,22,23]
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