Influence of the Substrate Size on the Cooling Behavior and Properties of the DED-LB Process

Q2 Engineering

Journal of Machine Engineering Pub Date : 2024-06-06 DOI:10.36897/jme/189582

Fabian Bieg, Clemens Maucher, H. Möhring

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引用次数: 0

Abstract

The laser-based Directed Energy Deposition (DED-LB) process involves a complex thermal history which strongly de-pends on the geometry of the deposited structure and substrate. The thermal mechanisms of the process are highly influenced by key process parameters like laser power, powder mass flow and scanning speed. Additionally, the size of the substrate influences the cooling behavior. The cooling behavior can be externally influenced and controlled by tempering the substrate, for example using a laser preheating method. The control of the cooling rate is crucial to ensure consistent properties and maintain constant conditions for subsequent finishing processes, irrespective of the size and geometry of the deposited structure and substrate. In this work, the influence of the substrate size on the cooling behavior and the properties of DED-LB manufactured structures is determined. The deposition of a cube with an edge length of 30 mm on different sized substrates and different cooling rates was simulated and executed. The impact of the different cooling behavior is evident in the hardness and the residual stresses of the deposited structures. Furthermore, the effect can be observed during a subsequent milling process. This work enables the creation of a model for the determination of the cooling rate and part properties depending on the substrate size.

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基底尺寸对 DED-LB 工艺冷却行为和特性的影响

基于激光的定向能沉积（DED-LB）工艺涉及复杂的热历史，这在很大程度上取决于沉积结构和基底的几何形状。该工艺的热机制受激光功率、粉末质量流量和扫描速度等关键工艺参数的影响很大。此外，基底的尺寸也会影响冷却行为。通过对基底进行回火（例如使用激光预热方法），可以从外部影响和控制冷却行为。无论沉积结构和基底的尺寸和几何形状如何，冷却速率的控制对于确保一致的性能和保持后续精加工过程的恒定条件至关重要。本研究确定了基底尺寸对 DED-LB 制造结构的冷却行为和性能的影响。模拟并执行了在不同尺寸基底和不同冷却速率下沉积边长为 30 毫米的立方体的过程。不同冷却方式对沉积结构的硬度和残余应力的影响显而易见。此外，在随后的铣削过程中也能观察到这种影响。这项工作有助于建立一个模型，根据基底尺寸确定冷却速率和零件性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Machine Engineering Engineering-Industrial and Manufacturing Engineering

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： ournal of Machine Engineering is a scientific journal devoted to current issues of design and manufacturing - aided by innovative computer techniques and state-of-the-art computer systems - of products which meet the demands of the current global market. It favours solutions harmonizing with the up-to-date manufacturing strategies, the quality requirements and the needs of design, planning, scheduling and production process management. The Journal'' s subject matter also covers the design and operation of high efficient, precision, process machines. The Journal is a continuator of Machine Engineering Publisher for five years. The Journal appears quarterly, with a circulation of 100 copies, with each issue devoted entirely to a different topic. The papers are carefully selected and reviewed by distinguished world famous scientists and practitioners. The authors of the publications are eminent specialists from all over the world and Poland. Journal of Machine Engineering provides the best assistance to factories and universities. It enables factories to solve their difficult problems and manufacture good products at a low cost and fast rate. It enables educators to update their teaching and scientists to deepen their knowledge and pursue their research in the right direction.