To improve Contact wear and fatigue fracture of Near β TB11（Ti15Mo） its surface properties need to be strengthened.
The control variable method is used to mechanically hammer the surface of TB11 alloy, and nanostructures with different grain sizes are prepared on the surface of TB11 alloy. The relationship between surface grain size and hardness and wear resistance was studied.
The results show that the surface grain size of TB11 titanium alloy basically tends to be stable after 30 minutes of hammering,32.21 nm in size, The hardness increased from 288 Hb to 399 Hb, about 42.5%, and the smaller the grain size, the higher the hardness.
Combined with the wear morphology and the finite element simulation results of pin disk wear, the Archard wear model is used for calculation. After the grain size is reduced to 30.84 nm, the wear depth is reduced by about 30% compared with the original grain. The smaller the grain size on the surface of TB11 alloy, the stronger the wear resistance, and the more difficult the nanolayer is to wear, indicating that mechanical hammering can effectively improve the surface properties of TB11 titanium alloy.
Chemical composition of TB11 alloy for an experiment (mass fraction,%)
|
Mo |
O |
Fe |
C |
H |
N |
Ti |
|
14.0~16.0 |
≤0.20 |
≤0.10 |
≤0.10 |
≤0.015 |
≤0.05 |
allowance |
XRD Diagram of TB11 Alloy Hammered at Different Times
Grain size and hardness values at different hammering times
|
Hammering time/min
|
0 |
10 |
20 |
30 |
40 |
|
Grain size/nm |
- |
65.32 |
45.23 |
32.31 |
30.84 |
|
Bhn |
280 |
341 |
376 |
392 |
399 |
