摘要
采用选区激光熔化技术(SLM)制备GH3536高温合金试样,通过改变激光功率和扫描速度研究工艺参数对成形试样密度、显微缺陷和表面质量的影响。结果表明:当激光能量密度从46.3 J/mm3增加到243.1 J/mm3时,成形试样密度得到显著提高并在8.30~8.35 g/cm3范围内波动,随着输入的激光能量进一步增加试样密度又略微下降。通过金相观察发现当输入激光能量不足时,试样内部存在大量不规则孔洞缺陷,然而当输入激光能量过高时,试样内部出现了许多分布均匀的微裂纹和气孔,说明激光能量过高或过低都会降低成形试样的致密度。进一步对成形试样表面黏附的飞溅颗粒统计分析后,确定了SLM成形GH3536合金的最佳工艺参数,对该参数下成形的试样进行室温拉伸性能测试,得到了具有良好室温拉伸力学性能的GH3536高温合金材料。
GH3536 superalloy was fabricated using Selective Laser Melting(SLM)to investigate the effect of process parameters including the laser power and scanning speed on the density,microscopic defects and surface quality of GH3536 samples.According to the measurement of density,it can be found that the density of samples increases rapidly when the laser energy density is less than 57.0 J/mm3,the density of samples fluctuates within the range of 8.30 g/cm3-8.35 g/cm3 as the laser energy density increases from 57.0 J/mm3 to 187.0 J/mm3,while the density of samples decreases slightly when the laser energy further increases.The conclusion is that the inadequate or excessive energy input reduces the density of samples.The metallographic observation shows that there are a large number of lack-of-fusion defects when the laser energy is insufficient.However,when the input laser energy is too much,many evenly distributed microcracks and gas pores appear inside of samples,indicating that defects are the main reason for low density of samples.The optimal process parameters of SLM-processed GH3536 alloy are determined by the statistical analysis of spatter particles which might cause irregular defects.Tensile properties of the sample fabricated under 175 W and 700 mm/s are tested at room temperature and the results show that the SLM-ed GH3536 superalloy has good tensile properties at room temperature.
作者
张璇
董安平
杜大帆
潘云炜
熊良华
孔源
孙宝德
ZHANG Xuan;DONG Anping;DU Dafan;PAN Yunwei;XIONG Lianghua;KONG Yuan;SUN Baode(Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《航空材料学报》
CAS
CSCD
北大核心
2022年第5期71-80,共10页
Journal of Aeronautical Materials
基金
国家自然科学基金项目(52071205,51901135)。
关键词
选区激光熔化
GH3536
工艺参数
显微缺陷
表面质量
selective laser melting
GH3536 superalloy
process parameter
microscopic defects
surface quality
