Full
Outline
Laser cladding is widely used in additive manufacturing， damaged-surface repair， and surface modification of Ti-6Al-4V alloys. However， the performance optimization of laser-cladded layers on this alloy is still limited by several issues， including locally coarse grains， excessive residual tensile stress， and limited improvement in corrosion resistance. In this study， a novel process combining laser cladding with synchronous laser shock peening is proposed. Through this synchronous composite process， a laser-shock forging effect is generated， enabling simultaneous cladding layer fabrication and strengthening. This further refines the microstructure， enhances the mechanical properties， and improves the corrosion resistance of the cladding layer. The results show that the lamellar β-Ti phase and acicular martensitic α′-Ti phase in the cladding layer prepared by the composite process are significantly refined， forming an interwoven and dense basket-weave structure. The microhardness of the cladding layer increases from 360-405HV0.2 to 470-530HV0.2， indicating a remarkable strengthening effect. Meanwhile， the average friction coefficient decreases from 0.42 to 0.35， corresponding to a reduction of 16.67%， and the volume wear loss decreases by 25.93%， confirming the significant improvement in wear resistance of the cladding layer. In addition， the shock wave induced by laser shock processing effectively promotes the transformation of residual tensile stress into compressive stress. The maximum residual compressive stress reaches 390 MPa， and the stress distribution becomes more uniform. The corrosion potential （Ecorr） of the cladding layer increases by 0.027 V， while the corrosion current density （icorr） decreases by 8.71×10-8 A·cm-2， indicating that the corrosion resistance is significantly enhanced and that passivation behavior occurs more readily.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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