同轴送粉激光成形中粉末与激光的相互作用

席明哲; 虞钢; 张永忠; 石力开

中国激光, 2005, 32 (4): 562, 网络出版: 2006-06-01

同轴送粉激光成形中粉末与激光的相互作用下载： 551次

Interaction of the Laser Beam and the Metal Powder Conveyed by Coaxial Powder Feeder

论文大纲

席明哲 ^1,*虞钢 ¹张永忠 ²石力开 ²

作者单位

¹ 中国科学院力学研究所, 北京 100080

² 北京有色金属研究总院复合材料中心,北京 100088

激光技术激光直接成形金属粉末能量交换有限元法温度场 laser technique laser direct forming metal powder energy exchange finite element method temperature field

摘要

详细介绍了同轴送粉激光成形过程中,金属粉末与激光束相互作用时间的计算方法。在ANSYS软件平台上,建立了金属粉末穿越激光束过程中粉末温度场的计算模型。系统计算了不同颗粒大小316L不锈钢粉末与不同功率激光束相互作用后的温度。在此基础上,计算了金属粉末与激光束的能量交换及金属粉末落入激光熔池后与激光熔池的能量交换。计算结果表明,在激光束直径为3 mm条件下,316L不锈钢粉末穿过功率大于1000 W的激光束后,所有尺寸金属粉末均被熔化,即金属粉末以液态进入激光熔池。通过金属粉末与激光束及激光熔池的能量交换计算,可知在激光成形中,约有5%的激光能量用于加热和熔化粉末,而大约95%的激光能量用于激光熔池的形成及由于热传导造成的热量损失。

Abstract

A method to calculate the interaction time between metal powder and laser beam during laser direct forming with the metal powder conveyed by coaxial powder feeder is introduced in detailed. A finite element method (FEM) model based on ANSYS software is established to calculate the temperature of the metal powder while it crosses through the laser beam. Under different laser power condition, after interaction with laser beam, the temperature of the 316L stainless steel (SS) powder of different size is calculated. Thus the laser energy absorbed from laser beam by metal powders is calculated. After 316L SS powders have entered laser molten pool, the energy exchange between laser molten pool and 316L SS powders is also calculated. The calculated results show that all 316L SS powders are melted after they have crossed through the laser beam with power larger than 1000 W. It is to say that the 316L stainless steel powders are turned from solid into liquid before they reach the surface of laser molten pool. The calculated results also show that during laser direct forming, approximately 5% of laser energy is used to heat and melt metal powders and 95% of laser energy is used to form laser molten pool and to compensate the heat loss due to thermal conduction.

参考文献

[1] R. Banerjee, C. A. Brice, S. Banerjee et al.. Microstructural evolution in laser deposited Ni-25at.-% Mo alloy [J]. Materials Science and Engineering, 2003, A347(4): 1~4

[2] . Banerjee, P. C. Collins, D. Bhattacharyya et al.. Microstructural evolution in laser deposited compositionally graded α/β titanium-vanadium alloys[J]. Acta Materialia, 2003, 51(6): 3277-3292.

[3] . O. Milewski, G. K. Lewis, D. J. Thoma et al.. Directed light fabrication of a solid metal hemisphere using 5-axis powder deposition[J]. Journal of Materials Processing Technology, 1998, 75(3): 165-172.

[4] Zhong Minlin, Ning Guoqing, Liu Wenjin et al.. Fundamental aspects on laser rapid & flexible manufacturing of metallic components [J]. Chinese J. Lasers, 2001, B10(suppl.):30～33

[5] Xi Mingzhe, Zhang Yongzhong, Zhang Pingzhi et al.. Influence of processing parameter on the microstructure and properties of 316L SS fabricated by laser direct deposition [J]. Chinese J. Lasers, 2002, A29(11):1045～1048
席明哲,张永忠,章萍芝等. 工艺参数对激光快速成型316L不锈钢组织性能的影响[J]. 中国激光, 2002, A29(11): 1045～1048

[6] Zhu Yanjie, Dong Xiaopeng, Yang XIaoli et al.. Application and improvement of finit-difference time-domain algorithm in the analysis of optical waveguides[J]. Acta Optica Sinica, 2003, 23(5): 565～571
朱燕杰,董小鹏,杨晓理等. 时域有限差分法在光波导分析中的应用及改进[J]. 光学学报, 2003, 23(5): 565～571

[7] Zhao Jinsong, Li Lifeng, Wu Zhenhua. Modeling of in|situ monitoring curves during development of holographic gratings [J]. Acta Optica Sinica, 2004, 24(8): 1146～1150
赵劲松,李立峰,吴振华. 全息光栅实时显影监测曲线的理论模拟 [J]. 光学学报, 2004, 24(8): 1146～1150

[8] . . Solidification in direct metal deposition by LENS processing[J]. J. Metals, 2001, 53(9): 30-34.

[9] Wang Zhengqiao, Wu Youlin. Stainless Steel [M]. Beijing: China Chemical Industry Press, 1991. 138～139
王正樵,吴幼林. 不锈钢[M]. 北京:化工工业出版社,1991. 138～139

[10] Chen Haitao, Li Huaji, Cao Yang. Numerical Simulation on Solidification Process of Foundry Goods [M]. Chongqing: Chongqing University Press, 1991. 210～211
陈海涛,李华基,曹阳. 铸件凝固过程数值模拟[M]. 重庆:重庆大学出版社,1991. 210～211

[11] Xi Mingzhe. Research on metallic parts fabricated by laser direct forming [D]. Beijing University of Science and Technology, 2002, 10:59～64
席明哲. 金属零件激光成型技术的研究[D]. 北京科技大学博士论文, 2002, 10:59～64

席明哲, 虞钢, 张永忠, 石力开. 同轴送粉激光成形中粉末与激光的相互作用[J]. 中国激光, 2005, 32(4): 562. 席明哲, 虞钢, 张永忠, 石力开. Interaction of the Laser Beam and the Metal Powder Conveyed by Coaxial Powder Feeder[J]. Chinese Journal of Lasers, 2005, 32(4): 562.

同轴送粉激光成形中粉末与激光的相互作用下载： 551次

关于本站 Cookie 的使用提示

全站搜索

同轴送粉激光成形中粉末与激光的相互作用 下载： 551次

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索

同轴送粉激光成形中粉末与激光的相互作用下载： 551次