(1. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063；
2. College of Engineering and Computer Science, Australian National University, Canberra, Australia)
摘 要: 開展了光內(nèi)同軸送粉的激光熔化沉積技術(shù)研究，建立光-粉-基板三者間相互作用的熱源模型，并使用此模型對(duì)不同工藝條件下激光熔化沉積Inconel718合金單道進(jìn)行數(shù)值模擬。模擬采用生死單元技術(shù)，通過改變單元材料屬性及重啟求解器來實(shí)現(xiàn)金屬粉末到實(shí)體的轉(zhuǎn)變。模擬結(jié)果表明：當(dāng)掃描速度不變時(shí)，隨著激光功率從500 W到1000 W，熔池逐漸變大，熔池最高溫度從2494 K升高到3456 K，沉積單道的寬度和高度變大。當(dāng)激光功率不變時(shí)，隨著掃描速度從5 mm/s增加到15 mm/s，熔池最高溫度從2494 K下降到2047 K，沉積單道的寬度和高度變小。模擬結(jié)果與實(shí)驗(yàn)結(jié)果基本相同，該模型具有較好的可靠性和重要的應(yīng)用價(jià)值。
關(guān)鍵字: 激光熔化沉積；數(shù)值模擬；Inconel718；溫度場(chǎng)
（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
