Hybrid Additive Manufacturing of Gamma Titanium Aluminide Space Hardware

2018 ◽  
Author(s):  
A. Seidel ◽  
T. Maiwald ◽  
T. Finaske ◽  
S. Polenz ◽  
S. Saha ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium

Hybrid Additive Manufacturing of Gamma Titanium Aluminide Space Hardware

2018 ◽  
Author(s):  
A. Seidel ◽  
T. Maiwald ◽  
T. Finaske ◽  
S. Polenz ◽  
S. Saha ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium

Effect of melt parameters on density and surface roughness in electron beam melting of gamma titanium aluminide alloy

2017 ◽  
Vol 23 (3) ◽  
pp. 474-485 ◽  
Author(s):  
Ashfaq Mohammad ◽  
Abdurahman Mushabab Al-Ahmari ◽  
Abdullah AlFaify ◽  
Muneer Khan Mohammed
Keyword(s):  
Surface Roughness ◽  
Electron Beam ◽  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Electron Beam Melting ◽  
Tial Alloy ◽  
Gamma Titanium Aluminide ◽  
Content Type ◽  
Gamma Titanium ◽  
New Material

Purpose Electron beam melting (EBM) is one of the potential additive manufacturing technologies to fabricate aero-engine components from gamma titanium aluminide (γ-TiAl) alloys. When a new material system has to be taken in to the fold of EBM, which is a highly complex process, it is essential to understand the effect of process parameters on the final quality of parts. This paper aims to understand the effect of melting parameters on top surface quality and density of EBM manufactured parts. This investigation would accelerate EBM process development for newer alloys. Design/methodology/approach Central composite design approach was used to design the experiments. In total, 50 specimens were built in EBM with different melt theme settings. The parameters varied were surface temperature, beam current, beam focus offset, line offset and beam speed. Density and surface roughness were selected as responses in the qualifying step of the parts. After identifying the parameters which were statistically significant, possible reasons were analyzed from the perspective of the EBM process. Findings The internal porosity and surface roughness were correlated to the process settings. Important ones among the parameters are beam focus offset, line offset and beam speed. By jointly deciding the total amount of energy input for each layer, these three parameters played a critical role in internal flaw generation and surface evolution. Research limitations/implications The range selected for each parameter is applicable, in particular, to γ-TiAl alloy. For any other alloy, the settings range has to be suitably adapted depending on physical properties such as melting point, thermal conductivity and thermal expansion co-efficient. Practical implications This paper demonstrates how melt theme parameters have to be understood in the EBM process. By adopting a similar strategy, an optimum window of settings that give best consolidation of powder and better surface characteristics can be identified whenever a new material is being investigated for EBM. This work gives researchers insights into EBM process and speeds up EBM adoption by aerospace industry to produce critical engine parts from γ-TiAl alloy. Originality/value This work is one of the first attempts to systematically carry out a number of experiments and to evaluate the effect of melt parameters for producing γ-TiAl parts by the EBM process. Its conclusions would be of value to additive manufacturing researchers working on γ-TiAl by EBM process.

Intrinsic Heat Treatment Within Additive Manufacturing of Gamma Titanium Aluminide Space Hardware

JOM ◽  
2019 ◽  
Vol 71 (4) ◽  
pp. 1513-1519 ◽  
Author(s):  
André Seidel ◽  
Shuvra Saha ◽  
Tim Maiwald ◽  
Juliane Moritz ◽  
Stefan Polenz ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium

Limitations of an Indentation Model for Grinding Gamma Titanium Aluminide

2002 ◽  
Author(s):  
H. Ali Razavi ◽  
Steven Danyluk ◽  
Thomas R. Kurfess
Keyword(s):  
Force Control ◽  
Titanium Aluminide ◽  
Normal Force ◽  
Removal Rate ◽  
Cubic Boron Nitride ◽  
Normal Component ◽  
Grinding Force ◽  
Cutting Depth ◽  
Gamma Titanium Aluminide ◽  
Gamma Titanium

This paper explores the limitations of a previously reported indentation model that correlated the depth of plastic deformation and the normal component of the grinding force. The indentation model for grinding is studied using force control grinding of gamma titanium aluminide (TiAl-γ). Reciprocating surface grinding is carried out for a range of normal force 15–90 N, a cutting depth of 20–40 μm and removal rate of 1–9 mm3/sec using diamond, cubic boron nitride (CBN) and aluminum oxide (Al2O3) abrasives. The experimental data show that the indentation model for grinding is a valid approximation when the normal component of grinding force exceeds some value that is abrasive dependent.

The Dependence of Tensile Ductility on Investment Casting Parameters in Gamma Titanium Aluminides

1998 ◽  
Vol 552 ◽  
Author(s):  
R. Raban ◽  
L. L. ◽  
T. M.
Keyword(s):  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Tensile Ductility ◽  
Gamma Titanium Aluminide ◽  
Cooling Rates ◽  
Gamma Titanium ◽  
Investment Cast ◽  
Thermal Data ◽  
Titanium Aluminide Alloys ◽  
Simulation Package

ABSTRACTPlates of three gamma titanium aluminide alloys have been investment cast with a wide variety of casting conditions designed to influence cooling rates. These alloys include Ti-48Al-2Cr-2Nb, Ti- 47Al-2Cr-2Nb+0.5at%B and Ti-45Al-2Cr-2Nb+0.9at%B. Cooling rates have been estimated with the use of thermal data from casting experiments, along with the UES ProCAST simulation package. Variations in cooling rate significantly influenced the microstructure and tensile properties of all three alloys.

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