采用最大输出功率为10kW的连续横流CO2激光器对铸造铝硅合金表面进行快速辐照加热重熔,并快速冷却凝固处理,以获得深度达1mm以上的表面改性层.通过SEM,XRD,EDS和TEM 研究了其表面改性层组织结构.结果表明,经过LSM处理后的表面改性层,组织明显细化,α-Al晶体中可固溶更多的Si原子,获得过饱和固溶体组织.另外,表面改性层的平均显微硬度在116～203HV之间,耐磨性明显高于基体材料,这是由于细晶强化和过饱和固溶效应引起的.
参考文献
| [1] | E Gaffet;J M Pelletier;S Bonnet-Jobez .Laser surface alloying of Ni film on Al-based alloy[J].Acta Materialia,1989,37:3205-3215. |
| [2] | H J Hegge;J TH M De Hosson .Microstricture of laser treated Al alloy[J].Acta Metallurgica Et Materialia,1990,38:2471. |
| [3] | R Li;M G S Ferreira;A Almeida;R Vilar,K G Watkins,M A Mcmahon,W M Steen .Localized corrosion of laser surface melted 2024-T351 aluminum alloy[J].Surface and Coatings Technology,1996,81:290-296. |
| [4] | T T Wong;G Y Liang .Effect of laser melting treatment on the structure and corrosion behavior of aluminum and Al-Si alloy[J].Journal of Materials Processing Technology,1997,63:930-934. |
| [5] | D Belforte;M Levitt.The Industrial Laser Annual Handbook[M].Penn Well Co,1986 |
| [6] | K G Watkins;M A Mcmahon;W M Steen .Microstructure and corrosion propertes of laser surface processed aluminum alloy.A review[J].Materials Science and Engineering,1997,15A:55-61. |
| [7] | E Ramous .Note on rapid surface melting by laser[J].Journal of Materials Processing Technology,1996,57:1-3. |
| [8] | M Rohsenow.Handbook of Heat Transfer[M].MeGraw-Hill New York,1973 |
| [9] | D G McCartney;J D Hunt .[J].Acta Materialia,1981,29:1851. |
| [10] | 胡汉起.金属凝固原理[M].北京:机械工业出版社:107-108. |
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