| LI Gang,ZHANG Ming,LIU Yun-ting,ZHANG Jing-bo.Application Effect of SiO2-based Laser Quenching Absorption-enhancing Coating[J],44(10):58-62 |
| Application Effect of SiO2-based Laser Quenching Absorption-enhancing Coating |
| Received:May 19, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.010 |
| KeyWord:laser technique absorption-enhancing coating SiO2 aggregate modified layer temperature change structure performance |
| Author | Institution |
| LI Gang |
College of Materials Science and Engineering, Liaoning Technical University, Fuxin , China |
| ZHANG Ming |
College of Materials Science and Engineering, Liaoning Technical University, Fuxin , China |
| LIU Yun-ting |
College of Materials Science and Engineering, Liaoning Technical University, Fuxin , China |
| ZHANG Jing-bo |
College of Materials Science and Engineering, Liaoning Technical University, Fuxin , China |
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| Abstract: |
| Objective To improve the absorption efficiency of laser in the laser surface quenching. Methods Normalized 65Mn steel was treated by cross flow CO2 laser processing machine, the surface of which was brushed with pure SiO2 aggregate(1#), w(SiO2): w(Al2O3)= 11:3(2#) and a purchased coating (3#), respectively. The temperature of sample as well as the depth and width of the surface modification layer was measured before and after quenching to characterize the microstructure, wear resistance and corrosion resistance of the surface modification layer. Results The hardened zone was composed of acicular martensite and a small amount of residual austenite, while the transition region was composed of semi-martensite and pearlite and ferrite. 1#, 2# coating samples showed large temperature changes, △t=22. 9 ℃. The modified layer of 1# coating sample had the largest hardness, reaching 1171. 5 HV, and its corrosion resistance was the best, with the current density of self-corrosion being 112. 2 μA/ cm2. The depth and width of 2# coating sample were both the biggest, reaching up to 1. 139 mm and 7. 2 mm, respectively, and its wear resistance was the best, with a wear rate of 2. 108 mg/ mm2. Conclusions SiO2 could be used as the aggregate of laser quenching absorption-enhancing coating, performance characterization, besides, the effect of laser absorption could be improved by mixing Al2 O3 in SiO2 . |
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