摘要
孔洞、未熔粉、裂纹是在激光选区熔化制备试样过程中常见的缺陷,迄今为止,大量研究均集中在减少缺陷上,关于工艺参数对缺陷影响的研究较少。本文系统研究了工艺参数对激光选区熔化Ti6Al4V合金相对密度、表面粗糙度、力学性能的影响。结果表明,低激光功率、高扫描速度和高层厚将会引起不充分的粉末熔化以及球化效应。最佳工艺参数为激光功率200 W,扫描速度500 mm/s,层厚10μm,扫描间距105μm。在该参数下,试样的抗拉强度1077 MPa,屈服强度907 MPa。
The metallurgical defects,such as pores,unmelted powders,and cracks,always appear in the processed components prepared by selective laser melting(SLM).The numerous researches focus on minimizing the inherent defects,but there are few studies on the effect of process parameters on these defects.The influence of process parameters on the relative density,surface roughness,and tensile properties of the selective laser melted Ti6Al4V were studied in this paper.The results show that,the low laser power,high scanning speed,and high layer thickness cause the insufficient melting and the balling effects.In the case of Ti6Al4V,the optimized process parameters are considered as the laser power of 200 W,scanning speed of 500 mm/s,layer thickness 30μm,and hatch distance of 105μm,with which the processed sample presents the ultimate tensile strength as 1077 MPa and the yield strength as 907 MPa.
作者
冯恩昊
王小齐
韩潇
周占伟
康楠
王清正
赵春玲
林鑫
FENG En-hao;WANG Xiao-qi;HAN Xiao;ZHOU Zhan-wei;KANG Nan;WANG Qing-zheng;ZHAO Chun-ling;LIN Xin(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China;MIIT Key Laboratory of High Performance Additive Manufacturing and Innovation Design of Metal Structure,Northwestern Polytechnical University,Xi’an 710072,China;Beijing Institute of Space Mechanics and Electricity,Beijing 100094,China;Beijing Satellite Manufacturing Co.,Ltd.,Beijing 100194,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2022年第6期555-563,共9页
Powder Metallurgy Technology
基金
中国航发集团产学研合作项目(HFZL2019CXY019)。
关键词
激光选区熔化
钛合金
工艺参数
表面粗糙度
力学性能
selective laser melting
titanium alloys
process parameters
surface roughness
mechanical properties
