摘要
采用选区激光熔化技术成形316L试样。通过改变打印策略研究层旋转角度对孔隙分布与孔隙率的影响规律,利用ANSYS APDL数值模拟,从熔池特征的变化分析孔隙产生的原因。结果表明,随着试样的热量累计,熔池尺寸、最高温度以及液相时间逐渐增加,熔池冷却速率会降低,从而导致孔隙的产生;随着层旋转角度的增加,孔隙分布均匀,孔隙率降低;激光重熔与隔层旋转扫描有利于熔池轮廓搭接和降低粉末球化现象的影响,有效降低孔隙率。
316L samples were formed by selective laser melting technology.The effects of layer rotation angle on the pore distribution and porosity were studied by changing the printing strategy,and using ANSYS APDL numerical simulation,the causes of the pores were analyzed from the changes of molten pool characteristics.The results show that with the excess heat accumulation,the size,maximum temperature and liquid phase time of the molten pool increase gradually,and the cooling rate of the molten pool decreases,resulting in the formation of pores.With the increase of layer rotation angle,pore distribution is uniform and the porosity decreases.Laser remelting and interlayer rotation scanning are beneficial to overlap the contour of molten pool and reduce the influence of powder spheroidization,and effectively reduce the porosity.
作者
董小书
章桥新
DONG Xiaoshu;ZHANG Qiaoxin(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《热加工工艺》
北大核心
2023年第12期105-108,共4页
Hot Working Technology
