Microstructure and mechanical properties of samples prepared by direct laser metal sintering with FGH95 alloys

被引：0
|
作者：
Fan J. [1 ,2 ]
Zhao J. [1 ]
机构：
[1] College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Zhangjiajie Aeronautical Engineering Vocational and Technical College, Zhangjiajie
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2011年 / 38卷 / 01期
关键词：
Direct laser metal sintering; Laser technique; Micro-hardness; Microstructure; Technology parameters;
D O I：
10.3788/CJL20113801.0103003
中图分类号：
学科分类号：
摘要：
Microstructure and mechanical performances of samples prepared by direct laser metal sintering (DLMS) technique with FGH95 superalloy were discussed. The experiment parameters that effected on the microstructure, the density and the micro-hardness of sample were analyzed systematically. Two kinds of crystal morphology appeared in the microstructure, one was equiaxial structure and the other was the dendrite structure. Size and number of these two kinds of crystal morphology varied with different parameters. The equiaxial structure has been trended to the dendrite structure and the density and micro-hardness of sample have been increased with the larger laser power, the slower scanning speed or the smaller scanning spacing in a certain range. In this certain range of parameters, a set of parameters, such as laser power of 900 W, scanning speed of 0.8 m/min, scanning spacing of 0.6 mm and thickness of 0.9 mm, have been achieved to fabricate an ideal sample that is provided with smooth sintering surface, fine crystal, higher micro-hardness and less micro-defect. The micro-hardness of the sample can reach 477 HV.
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