Workpiece-scale numerical simulations of SLM molten pool dynamic behavior of 316L stainless steel

被引:40
作者
Cao, Liu [1 ]
机构
[1] Guangzhou Univ, Adv Inst Engn Sci Intelligent Mfg, Guangzhou 510006, Guangdong, Peoples R China
关键词
Selective laser melting; Molten pool dynamic behavior; Equivalent processing model; Two-phase flow model; 316L stainless steel; Numerical simulation; VOLUMETRIC HEAT-SOURCE; FLUID-DYNAMICS; FLOW BEHAVIOR; LASER; POWDER; SPATTER;
D O I
10.1016/j.camwa.2020.04.020
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
316L stainless steel is currently one of the most critical stainless-steel materials due to its excellent corrosion resistance and comprehensive mechanical properties. Selective laser melting (SLM), as an additive manufacturing technology for directly forming complex metal parts, has been applied in the production of 316L stainless steel components. By introducing reasonable and comprehensive equivalent processing models (e.g., gasification pressure, gasification heat dissipation, and equivalent physical parameters), a predictive model of the dynamic behavior of the molten pool on the workpiece scale (two-phase flow model) was established for the SLM process of 316L stainless steel. The related equivalent processing models were customized by secondary development means based on the commercial software Fluent. By comparing and analyzing the different calculation schemes, it was found that surface tension stabilizes the liquid metal surface, while the Marangoni effect and the gasification recoil force cause the liquid metal surface to appear concave. The tangential movement of the liquid metal surface, caused by the Marangoni effect, causes the molten metal to accumulate around the central region, forming a liquid surface morphology resembling a crater. The influence of different processing parameters (scanning speed and laser power) on the SLM process of 316L stainless steel was analyzed. The simulated and experimentally obtained solidified track sizes were in good agreement. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码:209 / 228
页数:20
相关论文
共 36 条
[1]   A CONTINUUM METHOD FOR MODELING SURFACE-TENSION [J].
BRACKBILL, JU ;
KOTHE, DB ;
ZEMACH, C .
JOURNAL OF COMPUTATIONAL PHYSICS, 1992, 100 (02) :335-354
[2]   Selective laser melting finite element modeling: Validation with high-speed imaging and lack of fusion defects prediction [J].
Bruna-Rosso, Claire ;
Demir, Ali Gokhan ;
Previtali, Barbara .
MATERIALS & DESIGN, 2018, 156 :143-153
[3]   Mesoscopic-scale simulation of pore evolution during laser powder bed fusion process [J].
Cao, Liu .
COMPUTATIONAL MATERIALS SCIENCE, 2020, 179
[4]   Study on the numerical simulation of laying powder for the selective laser melting process [J].
Cao, Liu .
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2019, 105 (5-6) :2253-2269
[5]   Numerical simulation of the impact of laying powder on selective laser melting single-pass formation [J].
Cao, Liu .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2019, 141 :1036-1048
[6]   Study on the Numerical Simulation of the SLM Molten Pool Dynamic Behavior of a Nickel-Based Superalloy on the Workpiece Scale [J].
Cao, Liu ;
Yuan, Xuefeng .
MATERIALS, 2019, 12 (14)
[7]   Numerical Simulation of Liquid-Solid Conversion Affecting Flow Behavior During Casting Filling Process [J].
Cao Liu ;
Sun Fei ;
Chen Tao ;
Teng Zihao ;
Tang Yulong ;
Liao Dunming .
ACTA METALLURGICA SINICA, 2017, 53 (11) :1521-1531
[8]   Heat Transfer Model of Directional Solidification by LMC Process for Superalloy Casting Based on Finite Element Method [J].
Cao, Liu ;
Liao, Dunming ;
Lu, Yuzhang ;
Chen, Tao .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2016, 47A (09) :4640-4647
[9]   Investigation into the effect of process parameters on microstructural and physical properties of 316L stainless steel parts by selective laser melting [J].
Cherry, J. A. ;
Davies, H. M. ;
Mehmood, S. ;
Lavery, N. P. ;
Brown, S. G. R. ;
Sienz, J. .
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2015, 76 (5-8) :869-879
[10]   Thermal and mechanical finite element modeling of laser forming from metal and ceramic powders [J].
Dai, K ;
Shaw, L .
ACTA MATERIALIA, 2004, 52 (01) :69-80