Understanding the Rayleigh instability in humping phenomenon during laser powder bed fusion process

作     者：Wenxuan Zhang Wenyuan Hou Luc Deike Craig Arnold Wenxuan Zhang;Wenyuan Hou;Luc Deike;Craig Arnold

作者机构：Department of Chemical and Biological EngineeringPrinceton UniversityPrincetonNJ 08544United States of America Princeton Institute for the Science and Technology of MaterialsPrinceton UniversityPrincetonNJ 08544United States of America Department of Mechanical and Aerospace EngineeringPrinceton UniversityPrincetonNJ 08544United States of America High Meadows Environmental InstitutePrinceton UniversityPrincetonNJ 08544United States of America 

出 版 物：《International Journal of Extreme Manufacturing》 (极端制造（英文）)

年 卷 期：2022年第4卷第1期

页      面：85-92页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：the Princeton University Eric and Wendy Schmidt Fund for the financial support of this project。 

主　　题：additive manufacturing powder bed fusion dual lasers undulation humping 

摘      要：The periodic undulation of a molten track’s height profile in laser-based powder bed fusion of metals(PBF-LB/M)is a commonly observed phenomena that can cause defects and building failure during the manufacturing process.However a quantitative analysis of such instabilities has not been fully established and so here we used Rayleigh–Plateau theory to determine the stability of a single molten track in PBF-LB/M and tested it with various processing conditions by changing laser power and beam shape.The analysis discovered that normalized enthalpy,which relates to energy input density,determines whether a molten track is initially unstable and if so,the growth rate for the instability.Additionally,whether the growth rate ultimately yields significant undulation depends on the melt duration,estimated by dwell time in our experiment.