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用于控制Ti-6Al-4V平面层直接能量沉积过程中温度的层间时间估算方法

Estimation Method of Interpass Time for the Control of Temperature during a Directed Energy Deposition Process of a Ti-6Al-4V Planar Layer.

作者信息

Chua Bih-Lii, Ahn Dong-Gyu

机构信息

Faculty of Engineering, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia.

Department of Mechanical Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Korea.

出版信息

Materials (Basel). 2020 Nov 3;13(21):4935. doi: 10.3390/ma13214935.

DOI:10.3390/ma13214935
PMID:33153041
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7662936/
Abstract

Directed energy deposition (DED) provides a promising additive manufacturing method to fabricate and repair large metallic parts. However, it may suffer from excessive heat accumulation due to a high build rate, particularly during a wire feeding-type DED process. The implementation of interpass time in between two depositions of beads plays an important process role to passively control the interpass temperature. In this study, a method to estimate the proper interpass time using regression analysis from heat transfer finite element analysis is proposed for maintaining the interpass temperature during a wire feeding-type DED deposition of a planar layer. The overlapping beads of a planar layer are estimated using a polygonal-shaped bead profile in the finite element model. From the estimated proper interpass time, a selected proper interpass time scheme (PITS) is suggested for practical implementation. The selected PITS is applied in a thermo-mechanical finite element model to evaluate the temperature distribution and its effects on the depth of the melt pool, the depth of the heat-affected zone (HAZ), displacement, and residual stresses. By comparing the predicted results with those using a constant interpass time scheme (CITS), the selected PITS shows better control in reducing the depths of the melt pool and HAZ without severely inducing large displacement and residual stresses.

摘要

定向能量沉积（DED）为制造和修复大型金属部件提供了一种很有前景的增材制造方法。然而，由于高堆积速率，特别是在送丝式DED工艺过程中，它可能会出现过多的热量积累。在两次熔敷焊道之间设置层间时间对于被动控制层间温度起着重要的工艺作用。在本研究中，提出了一种利用传热有限元分析的回归分析来估算合适层间时间的方法，以在平面层的送丝式DED熔敷过程中维持层间温度。在有限元模型中使用多边形焊道轮廓来估算平面层的重叠焊道。根据估算出的合适层间时间，提出了一种选定的合适层间时间方案（PITS）以供实际应用。将选定的PITS应用于热-机械有限元模型中，以评估温度分布及其对熔池深度、热影响区（HAZ）深度、位移和残余应力的影响。通过将预测结果与使用恒定层间时间方案（CITS）的结果进行比较，选定的PITS在减少熔池和热影响区深度方面显示出更好的控制效果，同时不会严重引起大的位移和残余应力。

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