文章信息/Info

Title:

Simulation Study on Temperature Field of Laser Powder Bed Fusion

文章編號(hào):

1674-3962(2024)11-1035-08

作者:

王巖; 劉雨萌; 劉世鋒; 劉江偉; 魏瑛康; 王建勇; 張亮亮

1.西安建筑科技大學(xué)冶金工程學(xué)院，陜西 西安 710055 2.山東大學(xué)能源與動(dòng)力工程學(xué)院, 山東 濟(jì)南 250061

Author(s):

WANG Yan;  LIU Yumeng;  LIU Shifeng;  LIU Jiangwei;  WEI Yingkang; WANG Jianyong;  ZHANG Liangliang

1.College of Metallurgical Engineering, Xi�餫n University of Architecture and Technology, Xi’an 710055, China 2.School of Energy and Power Engineering, Shandong University, Jinan 250061, China

關(guān)鍵詞:

激光粉末床熔融; 介觀尺度; 數(shù)值模擬; 溫度場(chǎng); 熔池尺寸

Keywords:

laser powder bed fusion;  mesoscopic scale;  numerical simulation;  temperature field;  molten pool size

分類號(hào):

TP391.73;TG146

DOI:

10.7502/j.issn.1674-3962.202304010

文獻(xiàn)標(biāo)志碼:

A

摘要:

激光粉末床熔融具有不受結(jié)構(gòu)限制、近凈成形和效率高等優(yōu)點(diǎn)，廣泛應(yīng)用于航空航天、醫(yī)療以及核電領(lǐng)域。其成形過程中涉及多種復(fù)雜的且對(duì)構(gòu)件質(zhì)量有較大影響的物理現(xiàn)象，對(duì)材料加工參數(shù)的探索建立在高成本和低效率的大量的試錯(cuò)實(shí)驗(yàn)上。為了解決上述問題，提出了一種介觀尺度物理模型，聯(lián)合使用EDEM、Gambit以及FLOW-3D軟件對(duì)激光粉末床熔融成形過程中離散粉末床和粉末熔融進(jìn)行介觀尺度溫度場(chǎng)模擬，探究掃描速率對(duì)溫度場(chǎng)的影響規(guī)律、熔池形貌和尺寸的影響，闡明了溫度場(chǎng)演變規(guī)律。結(jié)果表明：激光功率P=215 W下，掃描速率V=900 mm·s-1為最優(yōu)工藝參數(shù)，熔道較為平直均勻，頸縮和球化缺陷最不明顯，成形過程中未發(fā)生飛濺和過熔等對(duì)構(gòu)件質(zhì)量產(chǎn)生不利影響的現(xiàn)象。采用實(shí)驗(yàn)對(duì)模型進(jìn)行驗(yàn)證，得到了良好的一致性。模擬結(jié)果可為激光粉末床熔融成形過程中工藝參數(shù)的探索提供一定的理論支撐。

Abstract:

Laser powder bed fusion is widely used in aerospace, medical and nuclear power fields. The forming process involves a variety of complex physical phenomena that have a great impact on the quality of components, also the exploration of material processing parameters is based on a large number of trial experiments with high cost and low efficiency. In order to solve the above problems, this paper proposes a mesoscopic physical model, the use of EDEM, Gambit and FLOW-3D software for discrete powder bed and powder melting during the laser powder bed fusion forming process for mesoscopic temperature field simulation, explore the influence of scanning speed on the temperature field. The influence of the morphology and size of the molten pool clarifies the evolution of the temperature field. The results show that under the laser power P=215 W, the scanning speed V=900 mm·s-1 is the optimal process parameter, the melting channel is relatively straight and uniform, the necking and spheroidization defects are the least obvious, and there is no phenomenon that adversely affects the quality of components such as splashing and overmelting during the forming process. The model was verified by experiments, and good consistency was obtained. The simulation results can provide some theoretical support for the exploration of process parameters in the process of laser powder bed fusion.