Study of hot-workability of titanium alloys through hottorsion testing and its application to the optimization of forging and extrusion processesWednesday (08.11.2017) 15:20 - 15:40 Part of:
In the development of hot metal forming, the metallic products must comply with the requirements imposed by current standards. In some cases, the required microstructure can only be obtained through thermo-mechanical processing. With titanium and its alloys, small ranges of good workability are an additional difficulty.
In this work the hot-workability of aeronautical quality titanium alloys was studied through hot torsion and compression testing. The results of these tests were used to define the material’s plastic behaviour seeking to optimize forging and extrusion operating parameters, such as temperature, strain rate, area reduction, etc. Additionally, different processing routes were simulated through hot-torsion testing and the resulting microstructures were analyzed.
The results of hot-workability testing plus the information registered in full-scale Grade 2 Ti extrusion tests were used to simulate different extrusion processes with FEA, considering a 2000 t Loewy hydraulic press. To calibrate the FEM model it was also necessary to evaluate the billet’s temperature evolution through the press’s feeding system and the behaviour of the available lubricants. Ring Tests were used to this effect, together with de macroscopic analysis of the extrusion test products.
Finally, the feasibility of extruding different sections was determined and the operating parameters were optimized to maintain the extrusion pressure within operative limits as well as to obtain the material’s properties and microstructures required in current standards.
|Category||Short file description||File description||File Size|
|Short Paper||BUNTE DEFERRARI - Short paper||This is the short paper to the abrstract||509 KB||Download|