电子束层覆凝固Inconel 718合金的元素挥发行为

Element Volatilization Behavior of Inconel 718 Alloy by Electron Beam Smelting Layered Solidification

基于电子束精炼Inconel 718合金元素挥发规律模型,设计了短时和长时熔化电子束层覆凝固工艺,研究了电子束层覆凝固制备Inconel 718合金的元素挥发规律以及层覆熔化时间和层覆层质量对元素挥发行为的影响。结果表明:当电子束功率为12kW且精炼时间为10min时,要实现电子束层覆凝固Inconel 718合金元素的精准控制,需要将层覆层质量控制在450g以上;电子束层覆凝固过程中应尽量缩短熔化时间(低于240s),直接将电子束功率升高到12kW进行精炼,可以有效地避免因长时间熔化导致的质量损失过大;层覆层质量的增加对电子束层覆凝固过程中合金元素的挥发规律影响不大,但有利于合金成分的精准控制。

Based on the model of element volatilization pattern of electron beam refined Inconel 718 alloy,the short-time and long-time melting electron beam smelting layered solidification processes were designed,and the element volatilization pattern of Inconel 718 alloy prepared by electron beam smelting layered solidification and the influence of the smelting time and the layer mass on the element volatilization behavior were investigated.The results show that in order to achieve precise element controlling of Inconel 718 alloy by electron beam smelting layered solidification,the layer mass should be controlled to at least 450g when the electron beam power was 12kW and the refining time was 10min.During the electron beam smelting layered solidification,the melting time should be reduced as much as possible(less than 240s),and the electron beam power should directly increase to 12kW for refining,which could effectively avoid excessive mass loss caused by long-term melting.The increase of the layer mass had little effect on the volatilization of alloying elements during the electron beam smelting layered solidification,but was beneficial to the precise controlling of alloy composition.