| DENG Yansheng,CAO Changhong,TAO Yanhui,SUN Cong.Laser Carburizing Grinding of Ti6Al4V Surface and Its Strengthening Mechanism[J],53(18):167-174 |
| Laser Carburizing Grinding of Ti6Al4V Surface and Its Strengthening Mechanism |
| Received:January 10, 2024 Revised:April 12, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.18.014 |
| KeyWord:Ti6Al4V laser carburizing grinding property-shape synergistic manufacturing processing-strengthening integration |
| Author | Institution |
| DENG Yansheng |
Jihua Laboratory, Guangdong Foshan , China |
| CAO Changhong |
Xinjiang Institute of Engineering, Urumchi , China |
| TAO Yanhui |
Xinjiang Institute of Engineering, Urumchi , China |
| SUN Cong |
Northeastern University, Shenyang , China |
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| Abstract: |
| Titanium alloy is considered as the superalloy and widely utilized in military, aerospace, biomedicine, and marine engineering for its special strength and property. Moreover, high-performance Ti6Al4V surfaces are in great demand in aerospace, military, automotive manufacturing and marine engineering. Many surface strengthening methods are applied in Ti6Al4V, such as electrochemical anodic oxidation, chemical vapor deposition, and plasma spraying technology. However, Ti6Al4V surface machining and strengthening technologies face challenges in balancing productivity, energy consumption and equipment cost. Nowadays, the laser technology has become a hot topic in the key part manufacture. The high precision surface removal is required to improve the surface quality. It can be found that these two procedures seem complicated and time-consuming. Immortally, the productivity rate decreases as well. To fill these gaps, an efficient integrated Ti6Al4V machining and strengthening technology, laser carburizing grinding, is proposed to study the control mechanism of property-shape synergistic manufacturing technology. With the help of the property-shape synergistic manufacturing method, the Ti6Al4V surface with higher strength can be obtained efficiently. The workpiece was coated by the carbon carburization paste, which was mixed by the carbon powder, the starch and the PVA-1799. Afterwards, the coated workpiece was set in the muffle furnace and was heated for 15 min at the temperature of 150 ℃. Therefore, the workpiece with the ready-made solid carbon source could be obtained. After the experiment item was confirmed, the grinding was conducted on the carbon coated workpiece assisted by the laser heating. The macroscopic characterization of the ground surface was testified by the force measurement, the temperature paperless recorder, the metallographic microscope, the microhardness tester, and the friction wear tester. The effects of laser carburizing grinding and conventional grinding on the mechanical properties and machining accuracy of Ti6Al4V surfaces were investigated by the designed comparative experiments. The microphase composition, microhardness, wear resistance and surface roughness of Ti6Al4V surfaces were characterized. Moreover, the positive effect of laser carburizing alloying on material removal by grinding and the modulating effect of grinding heat tempering on remelted layer properties were revealed. During the whole material removal process, the workpiece surface experienced two temperature rising process, which was on account of the grinding tempering process and the laser heating process respectively. The grinding tempering process could arise the surface temperature at 300 ℃. The assisted laser heating could arise the surface temperature at 1 700 ℃, and the higher temperature could cause the surface active carburization and the microstructure transformation. After laser carburizing grinding, the dendritic shape and granular shape microstructure could be observed at the laser grinding carburization surface. The surface microhardness of Ti6Al4V can reached 850HV, the wear loss was only 6.7% of that by conventional grinding, and the surface roughness Ra was reduced by 22%. To sum up, the proposed composite processing technology is beneficial for higher strength surface with higher precision compatibly. This study proposes a new technology of Ti6Al4V surface property-shape synergistic manufacturing, which fills the grinding processing-strengthening integration theory gap and has important practical significance in guiding industrial production. |
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