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在混合元素法激光立体成形(LSF)过程中,由于各种纯金属粉末或中间合金的密度、粒度不同,使得不同种的粉末输送性不同,即粉末离开送粉管后形成的粉末流的发散角,或粉斑直径不同,造成不同粉末进入熔池的比例与原始粉末配比不同,进而使得成形后试样成分与原始粉末配比之间产生偏差,不能得到名义成分试样。本文对不同种粉末的输送性进行观察,并建立从合金名义成分出发,反推原始粉末配比的实验和计算模型,并用混合元素法激光立体成形V-4Cr-4Ti合金为例对模型进行验证。
In the mixed element method laser three-dimensional forming (LSF) process, due to the different pure metal powder or intermediate alloy density, particle size, making different powder transport sex is different, that is, powder leaving the powder feeding tube formed after the divergence of the powder flow Angle, or the different diameters of the spots, resulting in different proportions of the different powders entering the melt pool, which leads to the deviation between the proportion of the formed sample and the original powder, and the nominal composition of the sample can not be obtained. In this paper, the transportability of different kinds of powders was observed, and the experiment and calculation model of the original powders were deduced from the nominal compositions of the alloys. The V-4Cr-4Ti alloy was also used as an example to verify the model .