基于约束力假设的激光粉末床熔融过程中的变形和残余应力演变

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Deqiao Xie, Jianfeng Zhao
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引用次数: 0

摘要

激光粉末床熔融技术是一种很有前途的技术,可以生产形状复杂的集成零件。然而,变形和残余应力这两个问题可能会降低制造零件的精度和性能。经典的热梯度机制为变形和残余应力提供了基本解释。激光粉末床熔融过程中的变形和残余应力的演变仍不清楚。在本研究中,我们使用了一个假定有约束力的物理模型来说明添加过程中变形和残余应力的演变。基于该模型,我们能够同时理解 X 向收缩、Z 向变形以及 X 向应力的 "拉伸-压缩-拉伸 "分布现象。由此可以得出结论,收缩、变形和 X 向残余应力都是由先前沉积层和新沉积层之间的约束造成的,而新沉积层在冷却时有很强的收缩趋势。零件的变形随沉积高度的增加而增大,尤其是在前几层。在添加过程中,X 方向应力的 "拉伸-压缩-拉伸 "分布得以保持。顶部拉伸应力的大小保持稳定,而底部拉伸应力则随着沉积高度的增加而增加。这项研究为全面了解激光粉末床熔化过程中变形和残余应力的演变提供了一个新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolutions of distortion and residual stress in laser powder bed fusion based on assumption of constraining force
Laser powder bed fusion is a promising technique that can produce complex-shaped and integrated part. However, distortion and residual stress are two issues that may decrease the precision and performance of built parts. Classical thermal gradient mechanism offers a basic interpretation toward distortion and residual stress. The evolutions of distortion and residual stress in laser powder bed fusion remain unclear. In this study, we used a physical model with an assumption of constraining force to illustrate the evolutions of distortion and residual stress during the additive process. Based on the model, we are able to understand the phenomenon of X-directional shrinkage, Z-directional distortion, and “tensile-compressive-tensile” distribution of X-directional stresses at the same time. It can be concluded that the shrinkage, distortion, and X-directional residual stress all result from the constraint between previously deposited layer and newly deposited layer, which has a strong shrinkage tendency when cooling. The distortion of part increases with deposition height, especially during first several layers. The “tensile-compressive-tensile” distribution of X-directional stresses can be maintained during the additive process. The magnitude of top tensile stress remains stable, while the tensile stress at bottom increases with the deposition height. This work provides a comprehensive understanding toward the evolutions of distortion and residual stress in laser powder bed fusion.
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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