i. yukhvid, d.e. andreev, v n. sanin, d.m ... - ism.ac.ru · • energy addition : cao2/al/ca, t c...
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SHS-PRODUCED TiAl CAST ALLOYS FOR ADDITIVE MANUFACTURING TECHNOLOGIES
V.I. Yukhvid, D.E. Andreev, V N. Sanin, D.M. Ikornikov,
E.A. Levashov, Zh.A. Sentyurina, A.A. Zaitsev, Yu.S. Pogozhev
Institute of Structural Macrokinetics and Materials Science RAS Chernogolovka
National University of Science and Technology MISiS Moscow
COIMBRA, PORTUGAL, 2016
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BASE STAGE OF STADY
1. Synthesis of semi-product cast ingots by centrifugal SHS
2. Vacuum induction remelting of semi-product into massive
electrodes for sputtering
3. Preparation of spherical granules by centrifugal sputtering
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TiO2/Nb2O5/Cr2O3/CAO2/Al/Ca → Ti-Al-Nb-Cr +Al2O3-CaO • base mixture: 3TiO2 + 7Al → 3TiAl + 2Al2O3, Tc = 1500K
• alloying addtions: Nb2O5/Al, Cr2O3/Al
• energy addition : CaO2/Al/Ca, Tc =3 800K
CHARACTERISTICS OF COMBUCTION PRODUCTS melting point:
• Ti-Al-Nb-Cr ~ 1800 K • Al2O3-CaO ~ 2000 K
specific weight: • Ti-Al-Nb-Cr ~ 4 г/см3
• Al2O3-CaO ~ 3 г/см3
CHEMICAL SCHEME FOR OBTAINING TiAl ALLOY WITH Nb-Cr ALLOYING AGENTS
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CENTRIFUGAL SHS INSTALATION
Overload – 50-500 g
Mass of initial mixtures from 0,5 to 3,0 kg.
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MAIN STAGES IN SHS OF TIAl-Nb-Cr ALLOY
(1) –oxide phase, (2) – alloy
V
2 initial
mixture
combustion product
1
gravity separation
u
combustion cooling, forming of structure
COMBUSTION PRODUCT WITH GOOD SEPARATION
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0,1 0,2 0,3 0,4 0,50
20
40
60
80
100
η1, η2, %
α(CaO2+Al)
u, см/с
uη2
η1
0
5
10
15
EFFECT OF ENERGETIC ADDITIONS ON CENTRIFUGAL SHS REGULARITIES
α- part of energetic addition in the initial mixture u – combustion velocity η1–sputtering of mixture during combustion η2 -yield of target materialin the ingot
initial mixture-TiO2/Nb2O5/Cr2O3/Al+ α (CaO2/Al/Ca)
a = 250g
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STRUCTURE AND COMPOSITION OF THE TiAl-Nb-Cr ALLOY
Ti Al Nb Cr 59,2 31,7 5,4 2,8
20 30 40 50 60 70 80
100
200
300
400
500
600
I/I0
2Θ
- TiAl- Ti3Al
microstructure phase composition
chemical composition
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COMPOSITION OF STRUCTURAL UNITS OF TIAl-Nb-Cr ALLOY
alloy microstructure
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BATCH OF TiAl ALLOY WITH Nb-Cr ALLOYING AGENTS
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Vacuum induction remelting of SHS ingots
(а) (б)
Vacuum induction remelting furness (a) with copper mold (б)
T=1600-1650°С
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SHS ingots Electrode Ti Al Nb Cr Ti Al Nb Cr
65,0 27,3 4,3 3,4 61,3 30,6 4,9 3,2
COMPOSITION AND STRUCTURE OF ELECTRODES
Chemical composition
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Scheem of installation
1 – working camera 2 – plasmatron 3 – electrod
PREPARATION OF SPHERICAL GRANULES BY CENTRIFUGAL PLASMA SPUTTERING OF
ELECTRODES.
Installation
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SPHERICAL GRANULES OF TiAl-Nb-Cr
d=100-125 мкм
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VIEW AND CHEMICAL COMPOSITION OF TiAl-Nb-Cr GRANULES
granule Ti Al Nb Cr 61,8 30,1 4,8 3,3
electrode Ti Al Nb Cr 61,3 30,6 4,9 3,2
CHEMICAL COMPOSITION
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Conclusions
1. Centrifugal SHS of ingots of TiAl alloys under centrifugal
forces was performed.
2. Optimization of vacuum induction remelting of TiAl- based
SHS alloys and crystallization conditions were carried out.
3.Method of spherical granules preparation of TiAl based alloys
by centrifugal plasma sputtering was created. .