An investigation of high temperature tensile properties of selective laser melted Ti-6AL-4V

Ti-6Al-4V alloy is successfully used in selective laser melting (SLM) especially for production of metal dental and surgical prostheses. On the other hand Ti-6Al-4V alloy is widely used in aerospace industry including applications with temperatures up to 350°C (623 K). In this work, for investigation of high temperature tensile properties, Ti-6Al-4V alloy tensile specimens were fabricated by selective laser melting. Tensile tests were carried out at room and elevated temperatures (up to 350°C). For all considered temperatures, SLM fabricated Ti-6Al-4V shown more strength and less ductility in comparison with wrought material.Published versio

Selective Laser Melting Of Nickel Base Heat Resistance Alloy EP648

For successful development of selective laser melting technology, it is important to increase the range of suitable materials. One of the most interesting materials for aerospace, automotive, shipbuilding and energy industries is heat-resistance superalloys. In this research EP648 nickel base heat resistance alloy was used for SLM. For determination of influence of SLM process parameters on EP648 4x4x4 mm cubic specimens were fabricated in SINTERSTATION® Pro DM125 SLM machine by using different process parameters (laser power, layer thickness, point distance, exposure time). The porosity of fabricated specimens was determined by scanning electron microscopy of polished cross-sections. SLM mode with lowest porosity (less than 1%) was selected for produce specimens for tensile strength tests. Tensile tests were carried out by using Gleeble 3800 Thermal-Mechanical Testing System for different test temperatures (up to 1073 K). Results of tests (ultimate tensile strength) showed that SLM produced EP648 by mechanical properties not inferior to cast material.Published versio