| JING Peng-fei,YU Shu-rong,SONG Wei,HE Yan-ni,SHAO Chen.Effect of Contact Load on Fretting Wear Behavior of TC4 Titanium Alloy[J],48(11):266-274 |
| Effect of Contact Load on Fretting Wear Behavior of TC4 Titanium Alloy |
| Received:April 11, 2019 Revised:November 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.11.029 |
| KeyWord:fretting wear contact state damage mechanism damage volume TC4 titanium alloy fretting map |
| Author | Institution |
| JING Peng-fei |
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou , China |
| YU Shu-rong |
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou , China |
| SONG Wei |
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou , China |
| HE Yan-ni |
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou , China |
| SHAO Chen |
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou , China |
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| Abstract: |
| The work aims to study the effect of fretting contact states, sliding regimes and damaged volumes on fretting wear under different loads and displacement amplitudes with fretting maps and the damage mechanism of materials in different fretting contact and sliding states, so as to provide certain theoretical support for fretting wear protection of mechanical components. The fretting friction and wear behaviors of TC4 titanium alloy against GCr15 steel ball were studied by SRV-V friction tester with a ball/plane contact configuration in a condition of dry friction with 50% relative humidity. After the experiment, the surface morphology, roughness, modulus of elasticity, wear volume, cross sectional morphology, microstructure, wear scar, wear debris, etc. of TC4 samples were tested with atomic force microscope, nanoindentation instrument, three-dimensional optical surface profilometer, SEM with EDS. Under low normal load, fretting regime was a gross slip. Abrasive wear, adhesive wear, oxidation wear, and fatigue delamination were the main damage mechanisms. On the other hand, under large loads, fretting regime was a partial slip and a mixed slip. In this case, damage mechanisms were correlated with fatigue cracks due to highly concentrated stress. In addition, under different fretting conditions, material damage areas were also different. Under complete slip regime, the damage was mainly concentrated in the center of the wear scar, and under partial slip conditions, the damage was mainly concentrated on the edge of the wear scar. Tangential friction and fretting amplitude are important factors affecting fretting wear. Wear debris at small displacement amplitude can slow down fretting wear of titanium alloy matrix material at contact surface, while wear debris at large displacement amplitude can intensify fretting wear of matrix material at contact surface. |
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