| GAO Guo-fu,PAN Xian-rong,CHANG Li-ming,WANG De-yu,ZHAO-Bo.Experimental Study on Organization and Properties of Ultrasonic Micro-forging Ti3Al Cladding Layers[J],52(8):433-443 |
| Experimental Study on Organization and Properties of Ultrasonic Micro-forging Ti3Al Cladding Layers |
| Received:September 16, 2022 Revised:November 11, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.08.039 |
| KeyWord:ultrasonic micro-forging Ti3Al cladding layer microstructure microhardness process parameters |
| Author | Institution |
| GAO Guo-fu |
Henan Polytechnic University, Henan Jiaozuo , China |
| PAN Xian-rong |
Henan Polytechnic University, Henan Jiaozuo , China |
| CHANG Li-ming |
Henan Polytechnic University, Henan Jiaozuo , China |
| WANG De-yu |
Henan Polytechnic University, Henan Jiaozuo , China |
| ZHAO-Bo |
Henan Polytechnic University, Henan Jiaozuo , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to achieve Ti3Al cladding layers with superior structure and good physical properties on Ti-6Al-4V substrate, by applying the surface modification technology combining ultrasonic vibration and micro-forging. In this work, a ultrasonic micro-forging device was built and the effect of ultrasonic amplitude, processing temperature, forging force and forging time on the metallographic organization, grain size and microhardness of the cladding layer was investigated by single-factor test. The macroscopic morphology and microstructure of the forged cladding layer were observed by a metallographic microscope (OM) and a scanning electron microscope (SEM). The microhardness of the forged cladding layer was studied through a microhardness tester. The structure and properties of the forged cladding layer were significantly improved by ultrasonic micro-forging treatment. The surface flatness of the forged cladding layer was positively correlated with the ultrasonic amplitude. With the increase of ultrasonic amplitude and forging force, the refinement degree of the coarse dendritic α2 phase breaking down into a large number of short rod-shaped α2 phases and needle-shaped α2 phases, along with a small amount of lamellar α2 phases and equiaxed α2 phases became more comprehensive. The content and distribution range of equiaxed crystals increased, and the grain refinement effect became more evident. The microhardness of each region of the forged cladding layer increased to some extent with the increase of ultrasonic amplitude and forging time. When the ultrasonic amplitude was 7 μm, the microhardness of the top, the middle and the bottom of the forged cladding layer increased by 18.4%, 22.8%, and 51.5% respectively. When the forging time was 5 s, the microhardness of the top, the middle and the bottom of the forged cladding layer increased by 15.5%, 15.8%, and 37.8% respectively. The microhardness of the top of the forged cladding layer appeared an increasing trend with the increase of forging force, and the microhardness was up to 55.1HRC, while that of other areas appeared a decreasing trend. Ultrasonic micro-forging can effectively improve the macroscopic morphology of the cladding layer, enhance its internal organization and refine the grain. Appropriate processing parameters can further increase the microhardness of the forged cladding layer. The ultrasonic micro-forging is an effective surface modification technology to improve the surface quality of the Ti3Al cladding layer. |
| Close |
|
|
|