Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第11期    总第236期    2018年11月

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文章编号:1004-0609(2018)-11-2296-09
激光熔化沉积Inconel718合金温度场及形貌的数值模拟
谭树杰1,李多生1,叶 寅1,QIN Qing-hua2,何俊杰1,邹 伟1

(1. 南昌航空大学 材料科学与工程学院,南昌 330063;
2. College of Engineering and Computer Science, Australian National University, Canberra, Australia
)

摘 要: 开展了光内同轴送粉的激光熔化沉积技术研究,建立光-粉-基板三者间相互作用的热源模型,并使用此模型对不同工艺条件下激光熔化沉积Inconel718合金单道进行数值模拟。模拟采用生死单元技术,通过改变单元材料属性及重启求解器来实现金属粉末到实体的转变。模拟结果表明:当扫描速度不变时,随着激光功率从500 W到1000 W,熔池逐渐变大,熔池最高温度从2494 K升高到3456 K,沉积单道的宽度和高度变大。当激光功率不变时,随着扫描速度从5 mm/s增加到15 mm/s,熔池最高温度从2494 K下降到2047 K,沉积单道的宽度和高度变小。模拟结果与实验结果基本相同,该模型具有较好的可靠性和重要的应用价值。

 

关键词: 激光熔化沉积;数值模拟;Inconel718;温度场

Temperature field and morphology simulation of laser melting deposited Inconel718 alloy
TAN Shu-jie1, LI Duo-sheng1, YE Yan1, QIN Qing-hua2, HE Jun-jie1, ZOU Wei1

1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. College of Engineering and Computer Science, Australian National University, Canberra, Australia

Abstract:Laser melting deposited technology was applied using an internal laser coaxial-powder feeding way, and the heat source model of among light-powder-substrate interaction was built, which was used to simulate the single channel of laser melting deposited Inconel718 alloy under different process parameters. The simulation was used by dead-live unit method, via changing the unit material properties and restarting solver to finish the change of metal powder to solid. The results show that when the scanning speed is constant, with increasing laser power from 500 W to 1000 W, the molten pool increases gradually, the highest temperature of molten pool also increases from 2494 K to 3456 K, and the width and height of deposited single channel increase. When the laser power is constant, with increasing scanning speed from 5 mm/s to 15 mm/s, the highest temperature of molten pool decreases from 2494 K to 2047 K, meantime, the width and height of deposition single channel decrease. The simulation results are almost consistent with the experimental results, thus, the model has good reliability and important application value.

 

Key words: laser melting deposition; numerical simulation; Inconel718; temperature field

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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