引入经典光学理论计算激光束与粉末流的相互作用,藉此研究了送粉速率对工件表面激光强度分布和不同位置颗粒温度的影响.计算结果表明:随送粉速率的增加,激光强度以及颗粒温度的最高值都显著降低;同时,激光强度分布和不同位置颗粒温度趋于均匀.由于对激光熔池中动力学过程的潜在影响,这些结果应在描述激光熔覆过程的数学模型中加以考虑.
The classical optical theory was introduced to calculate the interaction between laser beam and powder stream, on the basis of which the effect of powder feeding rate on the laser intensity and temperature of the particles at different sites on the surface of the workpiece was investigated. It is shown that the peak values of both laser intensity and particle temperature decrease with increasing the powder feeding rate. And simultaneously, the laser intensity distribution and the temperature of the particles at different sites on the surface of the workpiece tend to be even. It is suggested that such results should be considered in model of laser cladding due to their subtle effects on the dynamic processes in laser molten pool.
参考文献
| [1] | 黄延禄,马乃恒,邹德宁,梁工英,苏俊义.激光束作用下 Al-Ti-C活化粉料中的化学反应[J].稀有金属材料与工程,2003(12):999-1002. |
| [2] | 张松,张春华,刘常升,文効忠.铝合金表面激光熔覆NiCrBSi的空泡腐蚀性能[J].稀有金属材料与工程,2002(02):99-102. |
| [3] | 黄延禄,邹德宁,梁工英,苏俊义.送粉激光熔覆过程中熔覆轨迹及流场与温度场的数值模拟[J].稀有金属材料与工程,2003(05):330-334. |
| [4] | Picasso M et al.[J].International Journal of Numerical Methods for Heat and Fluid Flow,1994,4:67. |
| [5] | Lin J .[J].Optics & Laser Technology,1999,31:565. |
| [6] | Lin J.; .Numerical simulation of the focused powder streams in coaxial laser cladding[J].Journal of Materials Processing Technology,2000(1/2):17-23. |
| [7] | 胡项,陈振华,朱蓓蒂,曾晓雁,吴新伟.同步送粉激光熔覆的粉末分布密度[J].中国有色金属学报,1997(02):136-139. |
| [8] | Liu CY.;Lin JN. .Thermal processes of a powder particle in coaxial laser cladding[J].Optics & Laser Technology,2003(2):81-86. |
| [9] | Ludmila G Astafieva et al.[J].Journal of Quantitative Spectroscopy and Radiative Transfer,1999,63:459. |
| [10] | Ashish Tripathi et al.[J].Thermochimica Acta,2002,388:183. |
| [11] | 张庆茂,刘文今,杨森,钟敏霖.激光与熔覆粉末作用效率的计算及影响因素[J].激光技术,2002(03):170-173. |
| [12] | Born M;et al;杨葭荪.光学原理:光的传播、干涉和衍射的电磁理论[M].北京:科学出版社,1978 |
| [13] | Kerker M.The Scattering of Light and Electromagnetic Radiation[M].New York:Academic Press,1969 |
| [14] | 陈海清.铸件凝固过程数值模拟[M].重庆:重庆大学出版社,1991 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%