Modeling and numerical studies of selective laser melting: Multiphase flow, solidification and heat transfer

被引：49

作者：

He, Qiyang ^{[1
]}

Xia, Huanxiong ^{[1
]}

Liu, Jianhua ^{[1
]}

Ao, Xiaohui ^{[1
]}

Lin, Shengxiang ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China

来源：

MATERIALS & DESIGN | 2020年 / 196卷

基金：

中国国家自然科学基金;

关键词：

Selective laser melting; Additive manufacturing; Multiphase flow; Solidification; Heat transfer; POWDER-BED; POROSITY EVOLUTION; SINGLE TRACK; ENERGY INPUT; SIMULATION; MICROSTRUCTURE; MECHANISMS; PHYSICS; MULTILAYER; DYNAMICS;

D O I：

10.1016/j.matdes.2020.109115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A multiphase and multi-physics model is developed for the selective laser melting process, where fluid flow, lidification, and heat transfer are included. The discrete-element and volume-of-fluid methods are applied generate the powder bed and capture the free surface of the melts, respectively. Physical behaviors like surface tension, Marangoni effect, vapor recoil, and radiation are considered. A strategy that the heat source is allowed adaptively following the free surface of a molten pool along with power leakage-free is developed for the moving laser. The fundamental characteristics of the molten pool and solidified tracks are found and analyzed. The remolten region between two neighboring tracks in the horizontal and vertical directions is predicted, and effects of the scanning spacing and laser power on the width and depth of the remolten region are investigated. The results indicate that both the dimensions of the molten pool and remolten region depend on the process rameters anisotropically, varying the laser energy input could change the dynamic regime of a molten pool, and the pore defect can appear between adjacent tracks when using a large scanning spacing. (c) 2020 The Author(s). Published by Elsevier Ltd.

引用

页数：11