Multi-Physics Modeling of Melting-Solidification Characteristics in Laser Powder Bed Fusion Process of 316L Stainless Steel

Author:

Shan Xiuyang1,Pan Zhenggao2,Gao Mengdi1,Han Lu1,Choi Joon-Phil3,Zhang Haining24ORCID

Affiliation:

1. School of Mechanical and Electronic Engineering, Suzhou University, Suzhou 234000, China

2. School of Information Engineering, Suzhou University, Suzhou 234000, China

3. Department of 3D Printing, Korea Institute of Machinery & Materials, Daejeon 34103, Republic of Korea

4. School of Mechanical and Aerospace, Nanyang Technological University, Singapore 639798, Singapore

Abstract

In the laser powder bed fusion process, the melting-solidification characteristics of 316L stainless steel have a great effect on the workpiece quality. In this paper, a multi-physics model was constructed using the finite volume method (FVM) to simulate the melting-solidification process of a 316L powder bed via laser powder bed fusion. In this physical model, the phase change process, the influence of temperature gradient on surface tension of molten pool, and the influence of recoil pressure caused by the metal vapor on molten pool surface were considered. Using this model, the effects of laser scanning speed, hatch space, and laser power on temperature distribution, keyhole depth, and workpiece quality were studied. This study can be used to guide the optimization of process parameters, which is beneficial to the improvement of workpiece quality.

Funder

Research Project of Education Department of Anhui Province

Key Research and Technology Development Projects of Anhui Province

Doctor of Suzhou University Scientific Research Foundation Project

Scientific Research platform of Suzhou University

Research and Development Fund Project of Suzhou University

Basic Research Program funded by the Korea Institute of Machinery and Materials

Technology Innovation Program funded by the Ministry of Trade, Industry, and Energy

Publisher

MDPI AG

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