scholarly journals Microstructural refinement of boron-containing β-solidifying γ-titanium aluminide alloys through heat treatments in the β phase field

2013 ◽  
Vol 32 ◽  
pp. 12-20 ◽  
Author(s):  
M. Oehring ◽  
A. Stark ◽  
J.D.H. Paul ◽  
T. Lippmann ◽  
F. Pyczak
Keyword(s):  
Phase Field ◽  
Titanium Aluminide ◽  
Heat Treatments ◽  
Microstructural Refinement ◽  
Β Phase ◽  
Titanium Aluminide Alloys

Microstructural Refinement of a Ti‐40Al‐8Nb‐0.5B Alloy by Hot Deformation Within (α+β) Phase Field and Subsequent Tempering

2019 ◽  
Vol 21 (8) ◽  
pp. 1900239 ◽  
Author(s):  
Pujian Tian ◽  
Guang Yang ◽  
Zhenghao Ge ◽  
Yifei Wang ◽  
Liang Cheng ◽  
...  
Keyword(s):  
Phase Field ◽  
Hot Deformation ◽  
Microstructural Refinement ◽  
Subsequent Tempering ◽  
Β Phase

Microstructure Formation in Cast β-Solidifying γ-Titanium Aluminide Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1394-1399 ◽  
Author(s):  
Michael Oehring ◽  
Fritz Appel ◽  
Jonathan H.D. Paul ◽  
Renat M. Imayev ◽  
V.M. Imayev ◽  
...  
Keyword(s):  
Titanium Aluminide ◽  
Microstructure Formation ◽  
State Transformation ◽  
Solid State Transformation ◽  
Alloying Effect ◽  
Microstructural Refinement ◽  
Nucleation Sites ◽  
Cast Alloys ◽  
Titanium Aluminide Alloys ◽  
Kinetics Of

In view of the development of improved TiAl cast alloys the potential of the  transformation and its dependence on the addition of several alloying elements has been investigated. It was found that microstructural refinement in  solidifying alloys can be attributed to the alloying effect on the kinetics of the  transformation. This also holds for grain refinement through Borides which apparently serve as nucleation sites for the  phase in the solid-state transformation.

Influence of Heat Treatments on the Microstructure and Mechanical Properties in Ti-10V-2Fe-3Al Alloy

2015 ◽  
Vol 750 ◽  
pp. 160-165
Author(s):  
Cong Li ◽  
Jian Chen ◽  
Wei Li ◽  
Wei Qiu ◽  
Jian Jun He
Keyword(s):  
Mechanical Properties ◽  
Phase Field ◽  
Solution Treatment ◽  
Heating Time ◽  
Heat Treatments ◽  
Ongoing Research ◽  
Field Solution ◽  
Β Phase ◽  
Α Phase ◽  
Treatment Conditions

This paper reports the results of an ongoing research which was set up to investigate the effect of microstructures on the activity of different deformation mechanisms and the resulting mechanical behavior of the Ti-10V-2Fe-3Al alloy. Various microstructures were established by different heat treatments. Depending on the microstructures, obvious differences in the mechanical properties of this alloy were obtained. It is shown that in α+β phase field solution treatment conditions, with the increase of heating time, the fraction of globular α phase decreases, the compression strength increases. In β+(α+β) phase field solution treatment conditions, with the increase of heating time, alloys have opposite trends. In aging conditions, the microstructure and mechanical property do not change apparently with the aging time. The microstructure of the α phase and β phase has a great influence on the fractographic morphology.

Modeling of β→α Transformation in Complex Titanium Alloys

2011 ◽  
Vol 172-174 ◽  
pp. 1044-1049 ◽  
Author(s):  
Paolo Di Napoli ◽  
Benoît Appolaire ◽  
Elisabeth Aeby Gautier ◽  
Adeline Bénéteau
Keyword(s):  
Titanium Alloys ◽  
Phase Field ◽  
Nucleation And Growth ◽  
Heat Treatments ◽  
Β Phase ◽  
Growth Laws ◽  
Kinetics Of

A model has been developed which is able to predict the kinetics of β → α transformation in industrial multicomponent titanium alloys during complex heat treatments. It isbased on (i) analytical nucleation and growth laws based on simple geometric representationsof the di erent morphologies commonly observed in these alloys; (ii) the assumption of localequilibrium at interfaces, handled within the CalPhaD framework; (iii) averaged solute balancesin each morphology. The potentialities of the model will be demonstrated on the Ti17 industrialalloy upon isothermal holdings and cooling from the β phase field.

Microstructural Refinement of Boron Containing β-Solidifying γ-Titanium Aluminide Alloys

2012 ◽  
Vol 706-709 ◽  
pp. 1089-1094 ◽  
Author(s):  
Michael Oehring ◽  
Andreas Stark ◽  
Jonathan D.H. Paul ◽  
Thomas Lippmann ◽  
Florian Pyczak
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Grain Refinement ◽  
Titanium Aluminide ◽  
Grain Refining ◽  
Microstructural Refinement ◽  
Refining Effect ◽  
Prior Heat Treatment ◽  
Titanium Aluminide Alloys ◽  
Cast Condition

β solidifying γ titanium aluminide alloys exhibit fine and homogeneous microstructures in the cast condition, in particular if the alloys contain B as a grain refining agent. Following work in the literature [1], it is demonstrated that the grain refining effect due to B is solely attributed in such alloys to its effect on the solid-state β/α transformation. The results further show that grain refinement in these materials can be obtained by a simple heat treatment, even if the microstructure has been extensively coarsened through prior heat-treatment.

Mechanical properties of Zr–2.5%Nb pressure tube material subjected to heat treatments in α+β phase field

2014 ◽  
Vol 451 (1-3) ◽  
pp. 300-312 ◽  
Author(s):  
R.V. Kulkarni ◽  
K.V. Mani Krishna ◽  
S. Neogy ◽  
D. Srivastava ◽  
E. Ramadasan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Field ◽  
Heat Treatments ◽  
Pressure Tube ◽  
Tube Material ◽  
Β Phase

Effect of carbon on upper (α + β) phase field of Ti-5.6Al-4.8Sn-2.0Zr-1Mo-0.34Si-0.7Nd titanium alloy

2004 ◽  
Vol 20 (2) ◽  
pp. 167-172 ◽  
Author(s):  
S. Z. Zhang ◽  
G. P. Li ◽  
Q. J. Wang ◽  
Y. Y. Liu ◽  
R. Yang
Keyword(s):  
Titanium Alloy ◽  
Phase Field ◽  
Β Phase

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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