| WANG Cheng,DAI Peng-li,YAO Dong-ye,XIE Meng-yun,ZHANG Pei-yu,CHAI Yan.Influence of LSPwC on Fatigue Property of GH3044 Treated with Aging[J],48(8):280-285 |
| Influence of LSPwC on Fatigue Property of GH3044 Treated with Aging |
| Received:November 06, 2018 Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.037 |
| KeyWord:laser shock peening without coating aging carbide microstruture high temperature stress relaxation fatigue life |
| Author | Institution |
| WANG Cheng |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
| DAI Peng-li |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
| YAO Dong-ye |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
| XIE Meng-yun |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
| ZHANG Pei-yu |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
| CHAI Yan |
Key Laboratory of Plasma Dynamics, Air Force Engineering University, Xi’an , China |
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| Abstract: |
| The work aims to repair the GH3044 alloy treated with aging and improve the service life. LSPwC was adopted to treat the aging GH3044 alloy. The change of the surface phase of the specimen was analyzed before and after the treatment. In addition, the effect of aging and the strengthening process on the microstructure of the alloy surface was studied, and the stress relaxation and fatigue life of the alloy specimens before and after the treatment were compared. After solid solution at 1200 ℃, the single phase of the alloy specimen was γaustenite and WC. The main phase composition of the specimens before and after the composite treatment remained the same as austenite and Cr23C6. After aging for 100 h, the amount of carbide increased and the intercrystalline precipitation was obvious. Moreover, the surface residual stress value was -28.5 MPa and the fatigue life was about 1.013×106. After LSPwC, the carbide chains were broken and distributed more evenly. The surface residual stress was about -479.3 MPa and the fatigue life increased to 3.448×106, which was about 2.4 times higher than that of the aging specimen. After 120 min heat preservation at 800 ℃, the surface residual stress dropped by 32% and was -324.2 MPa, thus indicating that the specimen after strengthening process had better thermal stability. LSPwC can effectively improve the fatigue property of GH3044 alloy after aging treatment. |
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