中国空间科学技术2024，Vol.44Issue(2)：16-29,14.DOI:10.16708/j.cnki.1000-758X.2024.0018
选区激光熔化三维点阵结构尺寸效应研究进展
Research progress on size effect of three-dimensional lattice structure manufactured by selective laser melting
摘要
Abstract
The three-dimensional lattice structure technology is an innovative technology with both lightweight and function-structure integrated design.The selective laser melting technology for lattice structure forming faces serious size effect problems when forming cross-scale structures and gradient structures,which restricts the application and promotion of lattice structure.The"shape"and"performance"of the characteristic structure are important criteria for evaluating the printing quality.Therefore,taking the characteristic structure of three-dimensional lattice-struts and thin walls as the research objects,the relevant researches on size effect are systematically reviewed.Firstly,basing on the analysis of temperature field,this paper expounds the influence law of characteristic size on macroscopic heat accumulation and mesoscopic melt pool size,temperature gradient and cooling rate,which provides a basis for further"shape"and"performance"analysis.Secondly,defects and microstructure morphology are the main content of controlling"shape".Therefore,the influences of characteristic size on three kinds of defects degree(microporosity,dimensional accuracy and roughness),as well as two kinds of microstructural characteristics(grain size and orientation)are summarized,and the forming mechanism is analyzed.Finally,the influences of different defects and microstructure characteristics on the mechanical properties are compared to provide reference for the control of"performance"for the lattice structure.The research work of some scholars also shows that reasonable process parameter selection for specific feature size can effectively improve the printing quality and mechanical properties of the feature structure,which provides a reference for the process design of cross-scale structures and gradient structures,and also sparks inspiration for the exploration of extreme lightweight.关键词
尺寸效应/选区激光熔化/三维点阵结构/特征尺寸/多孔结构Key words
size effect/selective laser melting/lattice structure/characteristic size/porous structure分类
航空航天引用本文复制引用
彭成宽,祁俊峰,邵珩..选区激光熔化三维点阵结构尺寸效应研究进展[J].中国空间科学技术,2024,44(2):16-29,14.基金项目
国家自然科学基金-联合基金项目(U22B2083) （U22B2083）
民用航天技术预先研究项目(D020302) （D020302）
