| WANG Dawei,JIA Xu,HOU Tinghong,JIANG Rong,SONG Yingdong.Foreign Object Impact Resistance Test on Electron Beam Welding-Repaired TC4 Titanium Alloy FanBlades[J].航空发动机,2026,52(1):154-161 |
| Foreign Object Impact Resistance Test on Electron Beam Welding-Repaired TC4 Titanium Alloy FanBlades |
| DOI：10.12482/ISSN.1672-3147.20221121002 |
| Key Words:fan blades foreign object damage electron beam patch welding resistance to foreign object impact TC4 titanium
alloy crack aero-engine |
| Author Name | Affiliation | | WANG Dawei | Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China | | JIA Xu | Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China；
State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing 210016,China | | HOU Tinghong | State owned Chuanxi Machinery Factory,Chengdu 611936,China | | JIANG Rong | Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China； State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing 210016,China | | SONG Yingdong | Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China； State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing 210016,China |
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| Abstract:To evaluate the effect of electron beam welding (EBW) repair on the foreign object impact resistance of fan blades and
reveal their impact failure behavior, high-speed ballistic impact tests were conducted on actually repaired fan blades. The results show
that: under the same impact conditions, the intact blades suffer from strip-shaped sheet material loss along the chord direction after impact;
the repaired blades without post-treatment tend to have cracks propagating along the weld seam after impact; although the repaired blades
after heat treatment and shot peening strengthening first initiate impact cracks along the weld seam, the cracks stop propagating quickly
and no material loss along the weld seam occurs. This is because although the impact resistance of the weld seam is weaker than that of the
original blade material, heat treatment and shot peening strengthening can improve the impact resistance of the weld seam; the thinning of
the blade at the weld seam makes it easier to initiate cracks propagating along the weld seam, thereby reducing the impact resistance of the
blade; fracture analysis reveals that the impact fracture of the patch exhibits relatively large dimples, while the impact fracture of the weld
seam shows a stepped quasi-cleavage dimple composite feature with uneven heights. A large number of uneven and small-sized dimples
are distributed on the quasi-cleavage surface, which further indicates that the impact resistance of the weld seam is lower than that of the
original blade material. |
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