| BONGEN TITANIUM(CHINA) CO.,LTD |
The Brief Introduction for Foundryγ-TiAl Alloy
I. Alloy Composition (sheet-1)
Ti-46.5Al-2.5V-1Cr at.%
Ti-32.77Al-3.33V-1.36Cr wt.%
Sheet-1 (The chemical analyzed composition sheet of the alloy)
|
Ti wt% |
Al
wt% (at%) |
V
wt% (at%) |
Cr
wt% (at%) |
O
ppm |
N
Ppm |
H
ppm |
|
residue |
32.76(46.48) |
3.40(2.55) |
1.30(0.96) |
540 |
49 |
14 |
|
|
|
|
|
600 |
29 |
17 |
|
II. Physical Performance:
1. Density: 3.927 kg/cm3
2. Melting Point: 1460℃
3. Thermal diffusion, specific heat and heat conductivity (sheet-2)
Sheet-2 (Thermal diffusion, specific heat and heat conductivity)
|
Temp. ℃ |
Thermal Diffusion 10-6·m2·s-1 |
Specific Heat
J·kg-1·℃ |
Heat Conductivity
W·m-1·℃-1 |
|
100 |
6.31 |
679 |
16.8 |
|
200 |
6.62 |
687 |
17.9 |
|
300 |
7.02 |
698 |
19.3 |
|
400 |
7.45 |
710 |
20.8 |
|
500 |
7.85 |
725 |
22.4 |
|
600 |
8.16 |
742 |
23.8 |
|
700 |
8.31 |
762 |
24.8 |
|
800 |
8.24 |
783 |
25.4 |
|
900 |
7.91 |
807 |
25.1 |
|
1000 |
7.23 |
833 |
23.7 |
III. Thread Expand Modulus: (Sheet-3)
Sheet-3 (Thread Expand Modulus α×10-6/℃)
|
α25-100℃ |
α25-200℃ |
α25-300℃ |
α25-400℃ |
α25-500℃ |
α25-600℃ |
α25-700℃ |
α25-800℃ |
|
10.5 |
10.8 |
11.2 |
11.8 |
12.0 |
12.2 |
12.4 |
12.5 |
IV. Elasticity Modulus:
Tested under dynamics methods and as per GB/T2105-91 Standard(Sheet-4)
Sheet-4
|
Temp. ℃ |
Elasticity Modulus
E (Gpa) |
Shear Modulus
G (Gpa) |
μ |
|
26 |
162.7 |
60.9 |
0.336 |
|
100 |
160 |
59.9 |
0.34 |
|
200 |
157 |
58.7 |
0.34 |
|
300 |
154 |
57.2 |
0.34 |
|
400 |
150 |
56.0 |
0.34 |
|
500 |
146 |
54.5 |
0.34 |
|
600 |
142 |
53.4 |
0.34 |
|
700 |
138 |
51.0 |
0.35 |
V. Oxidize Limitation: ~870℃
Oxidize Speed: 0~50h: 0.008g/m2.h
50~300h: 0.005g/m2.h
VI. Mechanics performance
The mechanics performance of the alloy is very sensitive with
it’s micro-structure.
1. The typical data of tensile performance (Sheet-5)
| Temp. ℃ |
Elasticity Modulus
E (Gpa) |
Shear Modulus
G (Gpa) |
μ |
|
26 |
162.7 |
60.9 |
0.336 |
|
100 |
160 |
59.9 |
0.34 |
|
200 |
157 |
58.7 |
0.34 |
|
300 |
154 |
57.2 |
0.34 |
|
400 |
150 |
56.0 |
0.34 |
|
500 |
146 |
54.5 |
0.34 |
|
600 |
142 |
53.4 |
0.34 |
|
700 |
138 |
51.0 |
0.35 |
2. Breakage Toughness (Sheet-6)
| Sample No. |
Test Temp. |
Organization |
Kq Mpa·m1/2 |
|
1 |
Room Temp. |
NL |
29 |
|
2 |
21 |
|
3 |
28 |
|
4 |
26 |
|
5 |
22 |
Kq instead of K1C because of not all test conditions could be
met.
3. High Temperature Permanence and Creep
(1) Elongation permanence intension at 800℃, 150 hours, i.e. σ800℃150h
is higher than 200Mpa, see sheet-7
|
|
Test temp. |
Test Tension Mpa |
Test Time h |
Elongation % |
Remark |
|
1 |
800℃ |
150 |
164 |
|
no-break |
|
2 |
800℃ |
200 |
150 |
|
no-break |
|
2 |
800℃ |
200 |
150 |
|
no-break |
(2) Creep
1) 700℃, 200Mpa, 1000hours: total elongation εt =0.42%, plastic
elongationεp =0.299%, takes 336 hours to reachεp =0.2%, i.e. σ700℃0.2/300h≥200Mpa;
2) 700℃, 300Mpa, 500hours: total elongation εt =0.845%, plastic
elongationεp =0.65%, takes 52 hours to reachεp =0.2%, i.e. σ700℃0.2/50h≥300Mpa;
4. Rotated Twist Fatigue Tension
Room Temp. (no-break after 107 rounds) σ-1 =412Mpa
800℃ (no-break after 107 rounds) σ-1 =260Mpa
5. Cold & heat fatigue
This test is executed as per HB6660-1992 Standard, some samples
among them is tested by non-standard oil cold, see sheet-8
|
|
Test temp. ℃ |
Crack length |
Total Cycle Times |
Remark |
|
1 |
20~800 |
0.62 |
20 |
Water |
|
2 |
0.63 |
58 |
Oil |
|
3 |
0.50 |
58 |
Oil |
|
