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Effect of hot isostatic pressing on the microstructure of laser powder bed fused A20XTM alloy 热等静压对激光粉末床熔化 A20XTM 合金微观结构的影响
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012026
J Barode, E Bassini, A Aversa, D Manfredi, D Ugues, S Biamino, M Lombardi, P Fino
In the present work, an attempt has been made to do a combined hot isostatic pressing (HIP) & solution treatment in a single-step and the effect of different cooling rates (quenching and annealing) on the microstructure was examined. For a comparison, solution treatment (without HIP) was also analysed. It was observed that HIP treatment was successful in reducing the macro-porosities of the L-PBF part. Although, it was not an efficient treatment for the dissolution of the θ-Al2Cu phase. Furthermore, in both HIP-Quenched and HIP-Annealed treatments a sign of incipient melting was observed along the grain boundaries. Solution treatment without HIP did not show incipient melting.
本研究尝试将热等静压(HIP)和固溶处理结合在一起,并研究了不同冷却速度(淬火和退火)对微观结构的影响。为了进行比较,还分析了固溶处理(无 HIP)。据观察,HIP 处理成功地降低了 L-PBF 零件的宏观孔隙率。不过,这种处理方法并不能有效地溶解 θ-Al2Cu 相。此外,在 HIP 淬火和 HIP 退火处理中,沿晶界都观察到了萌芽熔化的迹象。未进行 HIP 的固溶处理则未出现萌芽熔化现象。
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引用次数: 0
Large-scale microstructure modelling of an additively manufactured part using cellular automata 利用蜂窝自动机建立快速成型零件的大规模微观结构模型
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012005
O Zinovieva, A Zinoviev, O Gokcekaya, Y Tang
This study represents the first attempt, to our knowledge, to simulate the grain structure of a laser powder bed fusion printed metal part exceeding 1,000 mm3 in volume using a workstation. Utilising our in-house cellular automata finite difference code with OpenMP for parallelisation, the model predictions closely align with experimental observations. The implemented model shows promising capabilities for estimating microstructures with reasonable accuracy and could serve as a powerful tool for digital manufacturing.
据我们所知,这项研究是首次尝试使用工作站模拟体积超过 1000 立方毫米的激光粉末床熔融打印金属部件的晶粒结构。利用我们内部的单元自动机有限差分代码和 OpenMP 并行化技术,模型预测结果与实验观测结果非常吻合。实施的模型显示了以合理的精度估算微观结构的良好能力,可作为数字化制造的有力工具。
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引用次数: 0
Understanding heterogeneous nucleation and predicting grain size in wire and arc additive manufacturing of steels with inoculation 了解异质成核并预测线材和电弧添加剂制造钢材时的晶粒大小
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012006
Y Xu, G. Tranell, Y Li
Inoculation has become a common practice to achieve grain refinement in metal additive manufacturing, and its application in steels has been extensively investigated in recent years. However, the nucleation behavior of equiaxed grains under high temperature gradient and fast cooling rate solidification conditions in additive manufacturing is still not well understood. And grain size prediction models for additive manufacturing of steel is lacking. In this work, a numerical microstructure simulation model is developed to simulate the growth and nucleation behaviors of grains in additive manufacturing, and to predict the grain size of inoculated steels with equiaxed grain structure. Here a wire and arc additive manufacturing (WAAM) of duplex stainless steel is selected for case study. The simulation results are in a good agreement with the experimental results.
接种已成为金属增材制造中实现晶粒细化的一种常见做法,近年来其在钢材中的应用已得到广泛研究。然而,人们对增材制造中高温梯度和快速冷却凝固条件下等轴晶粒的成核行为仍不甚了解。同时,也缺乏针对钢材增材制造的晶粒尺寸预测模型。本研究开发了一种微观结构数值模拟模型,用于模拟增材制造中晶粒的生长和成核行为,并预测具有等轴晶粒结构的接种钢的晶粒大小。这里选择了双相不锈钢的线弧快速成型(WAAM)作为案例研究。模拟结果与实验结果非常吻合。
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引用次数: 0
Cracking Mechanism in E-Beam 3D-Printed DZ125 Ni-based Superalloys 电子束三维打印 DZ125 镍基超合金的裂纹机理
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012031
Z Wang, Y Lin, Y Zhao, F Shangguan, K Chen
Directionally solidified Ni-based superalloys are extensively employed to manufacture turbine blades due to their outstanding high-temperature mechanical properties. To reduce overall costs, repairing techniques are highly demanded to restored the shape and properties of damaged turbine blades. In this study, as a surrogate for the repair process, DZ125 Ni-based superalloys were grown epitaxially with the electron beam powder bed fusion 3D-printing method on a base metal with the same chemical composition. Cracks are detected within the printed part, always along the high-angle grain boundaries and roughly parallel to the building direction. The cracks are identified to be liquation cracks, and the thermal cycling effects are proved to play an important role in crack initiation and propagation. The knowledge gained from this work provides valuable insights towards 3D-printing strategy development to obtain crack-free directionally solidified superalloys.
定向凝固镍基超合金具有出色的高温机械性能,因此被广泛用于制造涡轮叶片。为了降低总体成本,人们对修复技术的要求很高,以恢复受损涡轮叶片的形状和性能。本研究采用电子束粉末床熔融三维打印方法,在化学成分相同的基体金属上外延生长 DZ125 Ni 基超合金,作为修复过程的替代物。在打印部件中发现了裂纹,这些裂纹总是沿着高角度晶界出现,并与构建方向大致平行。这些裂纹被确定为液化裂纹,热循环效应被证明在裂纹的产生和扩展中发挥了重要作用。从这项工作中获得的知识为三维打印策略的开发提供了宝贵的见解,从而获得无裂纹定向凝固超合金。
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引用次数: 0
Backward facing step: from fluid flow to conjugate heat transfer with the coupling library preCICE 后向步骤:利用耦合库 preCICE 从流体流动到共轭传热
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1312/1/012007
C G Caccia, M Corti, A Della Torre, P Masarati
The Backward Facing Step geometry is a widely used benchmark problem in Computational Fluid Dynamics literature that is exploitable to validate models, solution methods, and software implementations. Despite a simple geometry, it shows phenomena like separation, reattachment, and re-circulation zones, under different flow conditions (i.e. different Reynolds number or turbulence parameters) it gives different measurable results, suitable for benchmarking activities [1]. Also regarding heat transfer analysis, the backward facing step can be used to investigate a wide variety of operating conditions (both for simple heat transfer cases and coupling heat transfer between the fluid region and a neighboring solid region giving rise to a more complex conjugate heat transfer model) [2]. This work uses the backward facing step as a test case to validate a numerical model built with the open-source Software OpenFOAM 10. The fluid and solid subdomains are connected through the open-source coupling library preCICE [3]. The results, taken from simulations carried out by the authors, show good agreement with the data available in the literature.
后向阶梯几何是计算流体力学文献中广泛使用的基准问题,可用于验证模型、求解方法和软件实现。尽管几何形状简单,但它显示了分离、重新附着和再循环区等现象,在不同的流动条件下(即不同的雷诺数或湍流参数),它给出了不同的可测量结果,适用于基准测试活动[1]。在传热分析方面,后向步骤也可用于研究各种运行条件(包括简单的传热情况,以及流体区域和邻近固体区域之间的耦合传热,从而产生更复杂的共轭传热模型)[2]。本研究将后向步骤作为一个测试案例,以验证使用开源软件 OpenFOAM 10 建立的数值模型。流体和固体子域通过开源耦合库 preCICE 连接[3]。作者的模拟结果与文献中的数据显示出良好的一致性。
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引用次数: 0
Exploring the feasibility of preparing Ti/Ti6Al4V composites by laser powder bed fusion 探索通过激光粉末床熔融制备 Ti/Ti6Al4V 复合材料的可行性
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012043
J Shen, Z Pan, V K Nadimpalli, T Yu
Ti-based alloys and composites are advanced lightweight materials that are indispensable for many critical applications. This study presents a novel strategy of fabricating laminated plates by printing Ti6Al4V on the surface of pure Ti substrate to obtain a composite structure combining coarse equiaxial and fine acicular grains. The molten pool layer is well bonded to the substrate surface and the chemical composition is rather uniform, due to melting of the substrate surface together with the powders and subsequent solidification. These findings provide a new path for material design, which will broaden the alternatives of structural materials applied in extreme service enviroment.
钛基合金和复合材料是先进的轻质材料,在许多关键应用中不可或缺。本研究提出了一种在纯钛基材表面印刷 Ti6Al4V 以获得粗等轴晶粒和细针状晶粒相结合的复合结构的层压板制造新策略。由于基材表面与粉末一起熔化并随后凝固,熔池层与基材表面结合良好,化学成分相当均匀。这些发现为材料设计提供了一条新的途径,将拓宽应用于极端服役环境的结构材料的选择范围。
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引用次数: 0
The Metallurgy of Additive Manufacturing: Potentials and Challenges towards Industrialisation 增材制造的冶金学:实现工业化的潜力与挑战
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012009
P Mayr, S Rauh, G Matheson, S Rotzsche, S Hartmann, E Kabliman
The present paper discusses the potential and challenges of processing metallic materials using additive manufacturing. Particular focus is given to laser powder bed fusion (PBF-LB/M) and the use of traditional alloy powders such as Al alloys and Ni-based superalloys, as well as novel materials such as metal-matrix composites. The research includes the improvement of the processability of these alloys using PBF-LB/M and optimizing material properties such as strength, creep resistance, and thermal conductivity of printed parts for various applications. Another important aspect presented within this manuscript is the digital representation of advanced manufacturing systems to improve manufacturability and enable advanced quality control. Herein, the development of a digital twin through in-situ process monitoring for the direct energy deposition process of laser metal deposition is presented. In the last part, the future of materials development for additive manufacturing is discussed, focusing on applying material computational techniques. All demonstrated examples result from the successful cooperation between the Chair of Materials Engineering of Additive Manufacturing, TUM, and its industrial and research partners.
本文讨论了使用快速成型技术加工金属材料的潜力和挑战。本文特别关注激光粉末床熔融(PBF-LB/M)和传统合金粉末(如铝合金和镍基超合金)以及新型材料(如金属基复合材料)的使用。研究内容包括利用 PBF-LB/M 提高这些合金的加工性能,以及优化材料性能,如打印部件的强度、抗蠕变性和导热性,以满足各种应用的需要。本手稿介绍的另一个重要方面是先进制造系统的数字化表示,以提高可制造性并实现先进的质量控制。本文介绍了通过对激光金属沉积的直接能量沉积过程进行现场过程监控而开发的数字孪生系统。最后一部分讨论了增材制造材料开发的未来,重点是材料计算技术的应用。所有展示的实例都是德国技术大学增材制造材料工程教席与其工业和研究合作伙伴成功合作的成果。
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引用次数: 0
Control of crystallographic textures by metal additive manufacturing-A review 金属增材制造的晶体纹理控制--综述
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012013
Takayoshi Nakano
Metal additive manufacturing (AM), a unique manufacturing method that stacks powder materials layer-by-layer to fabricate products with complex shapes and high precision, allows for a wide range of control over metallurgical microstructures. Metal AM defines solidification units with specific solidification directions and fast cooling, thereby enabling the control of the resulting metallurgical microstructure. However, the studies investigated texture control and utilizing textured microstructure are lacking in the literature. This review describes some of the results of our research on the control of crystallographic textures by laser powder bed fusion (LPBF), focusing on (1) the effect of powder properties on densification and crystallographic texture formation, (2) the effect of the melt pool shape and crystallographic characteristics of the starting material on the formation and orientation of single crystals, and (3) the successful application of alloy design to the preparation of highly functional single-crystalline-like textured biological high-entropy alloys considering specific solidification fields under LPBF.
金属增材制造(AM)是一种独特的制造方法,通过逐层堆叠粉末材料来制造形状复杂、精度高的产品,从而实现对冶金微观结构的广泛控制。金属 AM 定义了具有特定凝固方向和快速冷却的凝固单元,从而实现了对由此产生的冶金微观结构的控制。然而,文献中缺乏对纹理控制和利用纹理微观结构的研究。本综述介绍了我们通过激光粉末床熔融(LPBF)控制晶体纹理的部分研究成果,重点关注:(1)粉末特性对致密化和晶体纹理形成的影响;(2)熔池形状和起始材料的晶体学特征对单晶形成和取向的影响;以及(3)合金设计在 LPBF 下考虑特定凝固场,成功应用于制备高功能类单晶纹理生物高熵合金。
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引用次数: 0
Microstructure evolution in laser-based powder bed fusion of metals 基于激光的金属粉末床熔融过程中的微观结构演变
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012014
Venkata K Nadimpalli, Tianbo Yu
Laser-based powder bed fusion (LPBF) of metals offers the unique possibility of creating the microstructure voxel-by-voxel. The minimum voxel size in each direction is dependent on material dosing accuracy coupled with laser processing parameters. The rapid solidification conditions during LPBF lead to material heterogeneity coupled with hierarchical and non-equilibrium microstructures. The current paper delves into two different pathways available currently to control microstructure in LPBF, namely: in-situ microstructure control through material distribution to form functionally graded components with complex interfaces; application of post-processing thermo-mechanical treatments to control the microstructure. Unlike traditional manufacturing methods, each voxel in LPBF can be further processed multiple times after the first fusion process. Such in-situ processing presents further opportunity for tailoring the microstructure of each voxel in 3D. A future perspective is thus offered on the opportunities to control and engineer LPBF microstructures in metals.
基于激光的金属粉末床熔融(LPBF)为逐个体素创建微观结构提供了独特的可能性。每个方向的最小体素尺寸取决于材料配料精度和激光加工参数。LPBF 过程中的快速凝固条件会导致材料的异质性以及分层和非平衡微结构。本文深入探讨了目前用于控制 LPBF 中微观结构的两种不同途径,即:通过材料分布进行原位微观结构控制,以形成具有复杂界面的功能分级组件;应用后处理热机械处理来控制微观结构。与传统制造方法不同的是,LPBF 中的每个体素在第一道融合工序后都可以进行多次进一步加工。这种原位加工为定制每个三维体素的微观结构提供了更多机会。因此,我们可以从未来的角度来看待在金属中控制和设计 LPBF 微结构的机会。
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引用次数: 0
Cold spray - a solid-state additive manufacturing technology 冷喷--一种固态添加制造技术
Pub Date : 2024-08-01 DOI: 10.1088/1757-899x/1310/1/012044
Congcong Su, Yan Wang, Hanqing Che, Stephen Yue, Xiaoxu Huang
Cold spray is a solid-state powder deposition technique and has evolved into an additive manufacturing process. Unlike conventional additive manufacturing technologies that rely on melting and solidification, cold spray additive manufacturing (CSAM) forms components at low temperatures at a relatively high build rate. This article introduces the technical principles, process parameters and typical microstructure of cold spray, as well as its applications in the fabrication of 3D components and damaged component repair. Current issues faced in cold spray research and future development directions in CSAM are also discussed.
冷喷是一种固态粉末沉积技术,现已发展成为一种增材制造工艺。与依赖熔化和凝固的传统增材制造技术不同,冷喷增材制造(CSAM)在低温下以相对较高的成型率形成部件。本文介绍了冷喷的技术原理、工艺参数和典型的微观结构,以及其在三维部件制造和受损部件修复中的应用。文章还讨论了当前冷喷研究中面临的问题以及 CSAM 的未来发展方向。
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引用次数: 0
期刊
IOP Conference Series: Materials Science and Engineering
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