| LU Ying,ZHAO Ji-bin,QIAO Hong-chao,SUN Bo-yu.Strengthening Mechanism of TC17 Titanium Alloy Warm Laser Shock Peening[J],47(2):1-7 |
| Strengthening Mechanism of TC17 Titanium Alloy Warm Laser Shock Peening |
| Received:September 16, 2017 Revised:February 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.02.001 |
| KeyWord:warm laser shock peening (WLSP) residual stress dislocation dynamic strain aging fatigue heat treatment |
| Author | Institution |
| LU Ying |
Shenyang Institute of Automatic, Chinese Academy of Science, Shenyang , China |
| ZHAO Ji-bin |
Shenyang Institute of Automatic, Chinese Academy of Science, Shenyang , China |
| QIAO Hong-chao |
Shenyang Institute of Automatic, Chinese Academy of Science, Shenyang , China |
| SUN Bo-yu |
Shenyang Institute of Automatic, Chinese Academy of Science, Shenyang , China |
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| Abstract: |
| The work aims to improve fatigue properties of materials under alternating load and at high temperature, stabilize dislocation structure of materials. The pinning effect of dislocation was significantly enhanced, laser induced residual compressive stress was more stable, and high temperature instability of peening effect was effectively inhibited. Deeper residual stress layer and nanoscale precipitated phase were generated on the surface of materials by combining dynamic strain aging (DSA) (due to temperature rise) and warm laser shock peening (WLSP), which leaded to deeper residual stress layer and nanoscale precipitate. After WLSP at 200 ℃, microhardness of TC17 titanium alloy could reach 385HV, increased by 18.48% compared with that of original alloy, and 4.62% compared with that of alloy receiving LSP at room temperature. Residual compressive stress amplitude in depth direction first increased and then decreased, residual stress reached -236 MPa at 200 ℃, increased by 14.56%, compared with that receiving peening at normal temperature. Microstructure observation results showed that both stability and dislocation density of the dislocation structure were improved. High-temperature stability of residual compressive stress layer on the surface of materials is enhanced by WLSP technology, initiation and expansion inhibition of fatigue cracks are facilitated, stability of residual stress and surface strength at high temperature is effective improved. Warm laser shock peening technology is relatively easily operated, pollution-free, and plays a significant role in maintaining stability of residual stress at high temperature. |
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