Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (7): 857-868.DOI: 10.1007/s40195-019-00877-4
• Orginal Article • Previous Articles Next Articles
I. Ansarian 1,M. H. Shaeri 1(), M. Ebrahimi 2, P. Minárik 3
Received:
2018-10-28
Revised:
2018-11-26
Accepted:
2019-02-20
Online:
2019-02-20
Published:
2019-06-20
Contact:
M. H. Shaeri, shaeri@ENG.ikiu.ac.ir
I. Ansarian, M. H. Shaeri, M. Ebrahimi, P. Minárik. Tribological Characterization of Commercial Pure Titanium Processed by Multi-Directional Forging[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 857-868.
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Fig. 1 EBSD maps of CP titanium after a annealing, b six passes at room temperature, c six passes at 220 °C (ND normal direction, TD transverse direction)
Condition | Vickers hardness (HV) | Shear yield strength (MPa) | Tensile yield strength (MPa) |
---|---|---|---|
As-received | 136?±?7.27 | 207?±?14 | 228?±?17.15 |
One pass at RT | 209?±?4.71 | 393?±?11.8 | 433?±?24.3 |
One pass at 220 °C | 183?±?10.71 | 290?±?3.5 | 335?±?7.5 |
Three passes at RT | 246?±?4.71 | 450?±?1.0 | 560?±?35.2 |
Three passes at 220 °C | 225?±?12.8 | 406?±?5.0 | 450?±?37.41 |
Six passes at RT | 268?±?16.53 | 497?±?13 | 615?±?21.6 |
Six passes at 220 °C | 235?±?9.14 | 450?±?2.0 | 593?±?12.5 |
Table 1 Mechanical properties of CP titanium before and after MDF process up to six passes at both room temperature (RT) and 220 °C
Condition | Vickers hardness (HV) | Shear yield strength (MPa) | Tensile yield strength (MPa) |
---|---|---|---|
As-received | 136?±?7.27 | 207?±?14 | 228?±?17.15 |
One pass at RT | 209?±?4.71 | 393?±?11.8 | 433?±?24.3 |
One pass at 220 °C | 183?±?10.71 | 290?±?3.5 | 335?±?7.5 |
Three passes at RT | 246?±?4.71 | 450?±?1.0 | 560?±?35.2 |
Three passes at 220 °C | 225?±?12.8 | 406?±?5.0 | 450?±?37.41 |
Six passes at RT | 268?±?16.53 | 497?±?13 | 615?±?21.6 |
Six passes at 220 °C | 235?±?9.14 | 450?±?2.0 | 593?±?12.5 |
Fig. 2 Variation of wear rate versus pass number of MDF-processed CP titanium at room and high temperatures in applied normal stresses of a 1 MPa, b 1.5 MPa, c 2 MPa
Fig. 3 Variation of friction coefficient vs. sliding distance of CP titanium during MDF process up to six passes with applied normal stresses of 1 MPa a, b, 2 MPa c, d operating at room temperature a, c, 220 °C b, d, mean friction coefficients of samples before and after MDF process at room temperature e, 220 °C f
Fig. 4 SEM images of worn surfaces during applied normal stress of 1 MPa for a initial condition, b six passes at 220 °C, c six passes at room temperature, d EDS analysis of points A-C in c
Fig. 5 SEM images of worn surface during applied normal stress of 2 MPa for a initial condition, b six passes at 220 °C, c six passes at room temperature, EDS analysis of points A and B in d, c, e
Fig. 6 SEM images of abrasive particles during applied normal stress of 2 MPa for a initial condition, b six passes at 220 °C, c six passes at room temperature, EDS analysis of d points A-C in a, e points A and B in c
Fig. 7 SEM images of abrasive particles during applied normal stress of 1 MPa for a initial condition, b six passes at 220 °C, c six passes at room temperature
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