摘要
介绍了直接激光金属烧结(DMLS)成形WC颗粒增强镍基高温合金的基本原理,采用扫描电子显微镜(SEM),X射线衍射仪(XRD)和显微硬度计对烧结块体的微观形貌和成分进行了分析,研究了不同的工艺参数(激光功率、扫描速度)对烧结区的微观形貌、成分和微观硬度的影响。结果表明,在激光功率为900 W,扫描速度为0.7 m/min时,激光烧结性能较好,烧结致密度高,WC颗粒熔化为枝晶均匀地分散在基体中,增强颗粒能被固液界面捕捉,使WC颗粒能够很好地分散在基体里,提高烧结块体的性能。通过试验得到了一组优化的工艺参数,并由此烧结出结构致密、硬度较高的金属块体。
Theory of preparation of sub-micro WC particles reinforced Ni-base super alloy matrix composite using direct metal laser sintering（DMLS） is introduced.The effects of processing parameters,such as laser power,scanning speed on the microstructures,composition and microhardness of the laser sintered samples were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM） and microhardness tester.The result shows that the examples prepared by laser sintering have better performance and higher density under the laser power of 900 W,scanning speed of 0.7 m/min,for WC particles melt as dendrites disperse evenly in the matrix and can be captured by solid-liquid interface.The compact metal bulks with high hardness are fabricated successfully by DMLS with optimized processing parameters.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第3期868-872,共5页
Chinese Journal of Lasers
关键词
激光技术
激光烧结
WC颗粒
镍基合金
成形
laser technique
laser sintering
WC particles
Ni-base alloy
formation
