| LEI Yiteng,SONG Chengjie,XUE Wujun,HONG Yuan,SUN Cong.Ti6Al4V Surface Anti-fatigue Manufacturing Mechanism by Laser Carburizing Grinding[J],54(10):199-207, 265 |
| Ti6Al4V Surface Anti-fatigue Manufacturing Mechanism by Laser Carburizing Grinding |
| Received:October 18, 2024 Revised:December 31, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.10.016 |
| KeyWord:Ti6Al4V laser carburizing grinding property-shape synergistic manufacturing machining-strengthening integration |
| Author | Institution |
| LEI Yiteng |
Yili Normal University, Xinjiang Yining , China |
| SONG Chengjie |
Northeastern University, Shenyang , China |
| XUE Wujun |
Northeastern University, Shenyang , China |
| HONG Yuan |
Northeastern University, Shenyang , China |
| SUN Cong |
Northeastern University, Shenyang , China |
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| Abstract: |
| Ti6Al4V has been one of the most utilized titanium alloys in modern manufacturing due to its better mechanical properties. High-precision Ti6Al4V surfaces with superior properties are in urgent demand in the manufacturing industry. The existing production model that separates surface manufacturing and surface strengthening processes can lead to long production cycles, low production efficiency and severe resource consumption. Regarding the actual manufacturing process, surface precision removal and surface strengthening are two single surface processing technologies. The series procedure may bring about complicated processes, a long manufacturing period, and even more extra pollution emissions. Therefore, an integrated Ti6Al4V surface machining and strengthening method, laser carburizing grinding, is proposed. The related experiment is set up on a self-designed laser carburizing grinding system, which consists of an automatic grinder, a continuous laser shooting system, a minimal lubricant system, a force measurement system and a transient temperature measurement system. The separable graphite layer is applied on the Ti6Al4V (20 mm×60 mm), which is feasible for the pre-grinding before the experiment and can decrease the fixture frequency. By a separable graphite layer and a micro-lubrication system, the laser carburizing alloying process is coupled to the surface grinding process to achieve synergistic control of the machined surface properties and accuracy. In order to avoid the interference of the rotating grinding wheel, the continuous laser shoots on the upper side of the workpiece, leaving a 5 mm circular spot on the surface. Under the intense heat and shocking effect by continuous laser, the surface material rapidly melts and forms the surface remelt layer. Moreover, the minimal lubricant system is applied to improve the surface cooling velocity of the workpiece surface, which is helpful to increase the microstructure density and decrease the surface burn. The differences in surface micro-phase composition, surface morphology and mechanical properties between integrated processing (laser carburizing grinding) and separated processing (laser alloying & grinding) are compared experimentally. To be specific, the relative surface characteristic experiment is also conducted, and the recorded dynamic mechanical-thermal signal, the XRD, the metallographic phase, the SEM, the EDS, the microhardness and the wear resistance of the machining surface are compared and studied under the laser carburizing grinding and laser alloying & grinding respectively. The laser alloying and grinding tempering effects lead to diffusely distributed granular TiC phases within the remelt layer, improving the mechanical properties and grindability of the material surface. Meanwhile, the laser softening makes the multi-abrasive grain removal process more stable. After laser carburizing grinding, the thickness of the surface remelt layer is about 500 μm, the surface hardness reaches 652HV, and the surface wear resistance is greatly improved. Compared with the separated method, the surface shape accuracy increases by 20%. Grooves and bumps on the machined surfaces are reduced, and ample block shedding disappears. This study is an innovative attempt at Ti6Al4V surface machining-strengthening integration, and the related technology is of great practical significance in guiding production. Meanwhile, the results improve the titanium alloy surface property-accuracy synergistic control theory, which provides technical support for efficiently manufacturing high-performance Ti6Al4V surfaces. |
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