Part-scale thermal evolution and post-process distortion of Inconel-718 builds fabricated by laser powder bed fusion
Part-scale thermal evolution and post-process distortion of Inconel-718 builds fabricated by laser powder bed fusion
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通过激光粉末床熔融制造的 Inconel-718 结构的部分尺寸热演化和后处理变形
DOI：
10.1016/j.jmapro.2022.07.026
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发表时间：
2022
影响因子：
6.2
通讯作者：
Nassar, A. R.
中科院分区：
文献类型：
--
作者：
Wang, Q.;Michaleris, P.;Pantano, M.;Li, C.;Ren, Y.;Nassar, A. R.
在激光粉末床熔融（L-PBF）增材制造系统的逐层构建过程中对热演化的原位监测和评估对于帮助理解L-PBF的过程-结构-性能相关性起着关键作用。层间温度是指在粉末铺展之后但在扫描新层开始之前的层温度。它表示由于先前层的处理而导致的部件加热，并用作扫描新层的初始温度。因此，层间温度对于过程控制的推导是必不可少的，以最大限度地减少小孔和其他与热相关的缺陷。此外，层间温度的测量可用于验证部件级热建模或检测部件缺陷。本文介绍了一个实验研究的层间温度的演变，通过在现场热成像过程中的双正方形典型的零件的Inconel 718使用EOS M280系统的制造。加工后的变形测量的制造零件也获得洞察到的相关性的几何特征的一部分。实验结果表明，层间温度的演变与零件的独特几何特征和用于构建零件的支撑结构高度相关。在方形标准件的加工过程中，层间温度高达325 °C，这明显高于扫描部件第一层时预热的80 °C基板温度。制造后的构建测量表明，部件外壁表面的最大法向位移达到其厚度的约17%。实验结果还表明，峰值畸变和峰值层间温度并不发生在同一层，而是由不同的原因引起的。
In-situ monitoring and assessment of thermal evolution during the layer-by-layer build process of a laser powder bed fusion (L-PBF) additive manufacturing system play a pivotal role to help understand the process-structure-property correlation of the L-PBF. Interlayer temperature refers to the layer temperature after the powder is spread but before scanning a new layer commences. It represents the part heating due to the processing of the previous layers and acts as the initial temperature under which a new layer is scanned. Therefore, interlayer temperature is essential for the derivation of process control to minimize keyholes and other thermal-related defects. In addition, measurements of interlayer temperature can be used for validating part-scale thermal modeling or for detecting part defects. This paper presents an experimental study of the evolution of interlayer temperature through in-situ thermographic imaging during the fabrication of twin square-canonical parts of Inconel 718 using the EOS M280 system. Post-process distortion measurements of the fabricated parts are also obtained to provide insights into the correlation to geometric features of the part. The experimental results show that the evolution of the interlayer temperature highly correlates with the unique geometric features of the part and the support structure used to build the part. During the processing of the square-canonicals, the interlayer temperature reached as high as 325 °C, which is significantly higher than the preheated substrate temperature of 80 °C under which the first layer of the part is scanned. Measurements of the build after manufacturing show that the largest normal displacement of the part's outer wall surface reached about 17 % of its thickness. The results also show that the peak distortion and peak interlayer temperature do not occur at the same layer and are due to different causes.
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