Residual stress and hydrogen effect on Ti-6Al-4V alloys produced by Electron Beam Melting

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Residual stress and hydrogen effect on Ti-6Al-4V alloys produced by Electron Beam Melting

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Title Residual stress and hydrogen effect on Ti-6Al-4V alloys produced by Electron Beam Melting
Author(s) Maimaitiyili, Tuerdi ; Blomqvist, Jacob ; Steuwer, Axel ; Blackmur, Matthew ; Bjerkén, Christina ; Safdar, Adnan
Date 2013
English abstract
There is an internal, self-balanced stress known as residual stress (RS) that exists in all alloy systems without any external applied forces. Depending on the compressive or tensile nature and magnitude of the RS, it significantly affects the mechanical properties of the materials. Therefore, it is crucial to know the nature and magnitude of RS in material for safe and economical operation. In this work, we used unique, multipurpose, high energy (50-150 KeV) beamline I12-JEEP (Joint Engineering, Environment and Processing) at Diamond Light Source in UK with Energy Dispersive X-Ray Diffraction (EDXRD) setup to map up the RS states in one of the most popular titanium alloys with a code name Ti6Al4V. This type of titanium alloy is widely used in biomedical and aerospace industry because of their excellent combination of a high strength/weight ratio and good corrosion resistance. The Ti6Al4V which we were investigated are produced using electron beam melting (EBM) technique as a function of EBM processing parameters. In addition to relation between RS and processing parameters of EBM, the hydride formation versus processing parameters and as well as the effect of residual stress to the hydride precipitation in EBM built Ti6Al4V were investigated. To find out the effect of EBM processing parameters to the residual stress development, various samples produced with different beam size, scanning speed and different building thickness were investigated. From each type of the sample four specimens were prepared and three of them loaded with hydrogen in different concentrations, i.e. the hydrogen concentration of the various samples are 262, 772, 951 and 1410 ppm. Other than these alloy samples we also measured clean and hydrided original powder samples which are used for make these solid samples in our studies. After data collection, the whole pattern fitting method Rietveld and Pawely were performed with structure analysis software package Topas-Academic and GSAS. .
Language eng (iso)
Subject(s) EBM
synchrotron X-ray diffraction
hydrogen related degradation
Electron Beam Melting
Research Subject Categories::NATURAL SCIENCES
Note Svenska Mekanikdagar conference, June 12-15, 2013, Lund, Sweden
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