| ZHU Sheng,ZHANG Yao,WANG Xiao-ming,CHEN Yong-xing,HAN Guo-feng.The Effect of Scanning Speed on Structure and Performance of Al-based Amorphous Composite by Laser Cladding[J],45(7):136-142 |
| The Effect of Scanning Speed on Structure and Performance of Al-based Amorphous Composite by Laser Cladding |
| Received:March 22, 2016 Revised:July 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.023 |
| KeyWord:laser cladding scanning speed Al-based amorphous microhardness wear resistance |
| Author | Institution |
| ZHU Sheng |
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing , China |
| ZHANG Yao |
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing , China |
| WANG Xiao-ming |
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing , China |
| CHEN Yong-xing |
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing , China |
| HAN Guo-feng |
National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing , China |
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| Abstract: |
| Objective To fabricate Al-Ni-Y-Co-La amorphous composite claddings on 5083 substrates by laser cladding, and study the effects of laser scanning speed on microstructure and performance of the cladding. Methods YAG:Nd laser was used to fabricate Al-based amorphous composite claddings at the speed of 200, 300, 400 mm/min. OM, SEM, XRD, hardness tester and friction wear testing machine were used to observe the microstructure and test the microhardness and wear resistance of claddings. Results The cladding mainly consisted of α-Al, Al3Y, Al4NiY and other metallic compound phases. With the increase of scanning speed, the grain structure changed from the coarse banded crystal to the minor isometric crystal. When the laser scanning speed was over 300 mm/min, there was a partial amorphous phase. The average microhardness of the cladding was greater than 250HV0.1. When the scanning speed was 300 mm/min, the biggest microhardness of the cladding reached 300HV0.1. The average friction coefficient of cladding and substrate at low load when scanning speed was 200, 300, 400 mm/min was 0.384, 0.288, 0.304 and 0.571, and the corresponding average wear volume was 7.586×107, 2.516×107, 5.027×107, 45.638×107 μm3. The claddings showed very lower friction coefficient and wear volume than 5083 substrate. Conclusion Al-based amorphous composite claddings can be fabricated by laser cladding. When the laser scanning speed is about 300 mm/min, the cladding has the best formability and wear resistance. While the scanning speed further increases to 400 mm/min, the molten pool will towing substrate rewinding and floating, which leads to the severe segregation of the cladding and decrease its formability and wear resistance. |
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