| SHI Zengxiang,DANG Xiaofeng,LUO Sihai,GUO Jiachen,LIANG Xiaoqing,HE Weifeng,ZHOU Liucheng.Effect of Nanosecond Pulse Laser without Coating on Wear Resistance of DD5 Single Crystal Alloy[J],53(7):136-145 |
| Effect of Nanosecond Pulse Laser without Coating on Wear Resistance of DD5 Single Crystal Alloy |
| Received:April 09, 2023 Revised:June 19, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.07.014 |
| KeyWord:nickel-based single crystal superalloy nanosecond pulse laser aluminum oxide particle microhardness friction and wear wear mechanism |
| Author | Institution |
| SHI Zengxiang |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| DANG Xiaofeng |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| LUO Sihai |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| GUO Jiachen |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| LIANG Xiaoqing |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| HE Weifeng |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
| ZHOU Liucheng |
Aviation Plasma Dynamics Laboratory, Aeronautical Engineering College, Air Force Engineering University, Xi'an , China |
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| Abstract: |
| Nickel-based single crystal superalloys are widely used in advanced aero-engine turbine blades due to their excellent high temperature performance. However, the blade tenon is prone to wear failure due to the combined action of friction and alternating load during service. Nanosecond pulse laser shock peening without coating is an advanced laser surface modification technology, which improves the service performance of materials by improving the surface gradient structure of materials. The work aims to study the effect of nanosecond pulsed laser shock peening without coating on the wear resistance of nickel-based single crystal superalloy DD5 at high temperature (650 ℃). The nickel-based single crystal superalloy DD5 was cut into long squares of 30 mm×10 mm×3 mm under the (100)/[001] orientation condition and polished to 2000# with sandpaper until the surface roughness (Ra) of the material was less than 0.2 μm. Then, the sample was ultrasonically cleaned in alcohol for 30 min and dried. The YSM2000-C30A laser was used to treat the sample. The spatial energy was Gaussian distribution, the wavelength was 532 nm, the pulse width was 8-10 ns, and the spot diameter was 0.4 mm. The path of laser treatment was 'S' shape, the frequency was 500 Hz, and the overlap rate was 50%. The samples were treated with laser energy of 50, 80, and 120 mJ, respectively, and water was used as the constraint layer. Then, the microstructure of the surface layer of single crystal superalloy DD5 was observed by ultra-depth-of-field optical microscope (Keyence, KH-8700, Japan) and scanning electron microscope (Zeiss, Segma 300, Germany). The element analysis of nickel-based single crystal superalloy was carried out by energy spectrometer. The surface profile and roughness of the material were analyzed by open source software Gwyddion 2.58, and the microhardness of the surface and cross section of the material were tested by microhardness tester (Huayin, HV-1000A, China). The friction test was carried out on a multifunctional friction and wear tester (Retec, MFT-5000, America). The volume loss after friction and wear was calculated, and the morphology after the friction surface was observed. After laser treatment, the remelting layer and plastic deformation layer are formed on the surface of nickel-based single crystal superalloy and 50 mJ is the best energy parameter. During the interaction of nanosecond pulsed laser with nickel-based single crystal superalloy, the constraint layer (water) is ionized to generate oxygen. Oxygen reacts with Al in the single crystal alloy to generate nano-scale alumina particles. Under the action of laser-induced shock wave, alumina particles are embedded in the remelting layer, which increases the surface hardness of nickel-based single crystal alloy by 21.2%-31.4%. In addition, the plasma generated by the laser acting on the surface of the material expands rapidly. During the expansion process, the plasma is limited by the constraint layer (water) and repeatedly hits the surface of the material, causing severe plastic deformation on the surface of the single crystal alloy. A large number of slip bands are generated, which in turn increases the KAM value of the surface layer of the single crystal alloy and generates a hardened layer with a gradient structure. Under the combined action of the hardened layer and the remelted layer, the wear rate of the nickel-based single crystal superalloy decreases by 19.7%-37.6% under the best energy parameter. The wear mechanism of Ni-based single crystal superalloy is changed from abrasive wear and adhesive wear to abrasive wear. |
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