Flow Behavior of Metal Micro-melting Pool during Selective Laser Melting Process

Zhao Dingguo; Chen Yang; Zhi Baoning; Lü Xiaofang; Wang Shuhuan

doi:10.15980/j.tzzz.2020.11.013

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Flow Behavior of Metal Micro-melting Pool during Selective Laser Melting Process
Vol. 40, Issue 11, Pages: 1240-1244(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.11.013

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[1]赵定国,陈洋,支保宁,吕晓芳,王书桓.选区激光熔化过程金属微熔池流动行为研究[J].特种铸造及有色合金,2020,40(11):1240-1244.

Zhao Dingguo, Chen Yang, Zhi Baoning, et al. Flow Behavior of Metal Micro-melting Pool during Selective Laser Melting Process. [J]. Special Casting & Nonferrous Alloys 40(11):1240-1244(2020)
[1]赵定国,陈洋,支保宁,吕晓芳,王书桓.选区激光熔化过程金属微熔池流动行为研究[J].特种铸造及有色合金,2020,40(11):1240-1244. DOI： 10.15980/j.tzzz.2020.11.013.

Zhao Dingguo, Chen Yang, Zhi Baoning, et al. Flow Behavior of Metal Micro-melting Pool during Selective Laser Melting Process. [J]. Special Casting & Nonferrous Alloys 40(11):1240-1244(2020) DOI： 10.15980/j.tzzz.2020.11.013.

摘要

采用数值模拟对选区激光熔化工艺过程中不锈钢微熔池在激光下的熔炼过程进行了模拟

研究了激光功率、光斑直径以及激光加载时间对微熔池内流体运动的影响。模拟结果表明

增大激光功率和减小光斑直径

可以有效地降低流体涡流高度和提高流体流动速度

采用200 W、20μm光斑直径或400 W、40μm光斑直径作为热源

可使得微熔池达到平稳的流动状态。

Abstract

The numerical simulation method was used to understand the smelting process of the stainless steel micro-melt pool under the laser during the selective lasermelting process. The effects of laser power

spot diameter and laser loading time on the fluid motion in the micro-melt pool were investigated. The results reveal that increase of laser power and reduction of the spot diameter can effectively reduce the height of fluid vortex and increase the flow velocity of fluid. The molten pool can reach the stableflow state with using a spot diameter of 200 W

20 μm or 400 W

40 μm as the heat source.