Article
Materials Science, Multidisciplinary
Josip Vincic, Alberta Aversa, Mariangela Lombardi, Diego Manfredi
Summary: Laser directed energy deposition (L-DED) was used to produce nearly fully dense samples of the newly patented W360 hot work tool steel by Bohler. The microstructural evolution and mechanical response of the samples were analyzed after quenching and tempering cycles, revealing a martensitic structure with Mo-rich carbides dispersed in a martensitic matrix. The high microhardness value of 634 HV indicates that W360 is a promising candidate for tool build and repair purposes.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Yuan Tian, Kanwal Chadha, Sang Hoon Kim, Clodualdo Aranas
Summary: The Heatvar alloy was specifically designed for the Laser Powder Bed Fusion (LPBF) process and can withstand prolonged exposure to heat in the tool and die industries. Microstructural evolution, mechanical properties, and texture development were studied after heat treatment. Different heat treatment temperatures were used to increase hardness, tensile strength, and yield strength through dissolution and precipitation of Fe2Mo.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Laukik P. Raut, Ravindra Taiwade
Summary: In this paper, a bimetallic structure consisting of austenitic stainless steel (ASS) and low carbon steel (LCS) was successfully manufactured using the wire arc additive manufacturing (WAAM) technology. The microstructure and mechanical properties of the bimetallic structure were analyzed, showing a strong mechanical bonding and toughness at the interface.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Yiwei Sun, Jialong Wang, Menglin Li, Yuxuan Wang, Changhao Li, Ting Dai, Menglong Hao, Hui Ding
Summary: Fabricating molds and dies using additive manufacturing (AM) technology is attractive for higher cooling efficiency. This study investigated the thermal and mechanical properties of an H13 tool steel processed by selective laser melting (SLM) and identified the factors affecting its thermal conductivity.
MATERIALS & DESIGN
(2022)
Article
Automation & Control Systems
Christoph Halisch, Bjoern Milcke, Tim Radel, Ruediger Rentsch, Thomas Seefeld
Summary: Wire arc additive manufacturing (WAAM) of titanium parts has potential for aerospace application due to its high deposition rates, especially for expensive alloys like Ti-6Al-4V. However, the high oxygen affinity of Ti-6Al-4V at elevated temperatures requires excellent shielding gas coverage during the welding process. This study investigates the influence of oxygen content in the shielding gas chamber on the mechanical properties of Ti-6Al-4V, and concludes that even at high oxygen levels, the welding process is stable and can meet aerospace requirements for tensile properties.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
E. Eimer, S. Ganguly, S. Czink, S. Dietrich, B. Chehab, J. Ding, S. Williams
Summary: The effect of inter-pass rolling on a 2024 aluminium alloy wire-based DED built structure and the impact of cold work during the deposition process on the microstructure and mechanical performances were assessed. Two variants of gas metal arc process were used to deposit the alloy, and the effects of deposition process, cold work, and heat treatment were studied. It was found that the material response to inter-pass rolling and the formation of rolling defects depended on the deposition process variant and bead geometry. Furthermore, the application of cold work and heat treatment led to a reduction of anisotropy and an increase in ductility compared to heat-treated deposit without any inter-pass rolling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Miwen Yuan, Yu Cao, Seshendra Karamchedu, Seyed Hosseini, Yiming Yao, Johan Berglund, Libin Liu, Lars Nyborg
Summary: In this study, a modified H13 hot-work tool steel was fabricated using laser beam powder bed fusion technology, and the effects of two post processing methods on the material properties were evaluated. The results showed that the impact toughness of the direct tempering samples was significantly lower than the conventional quenching followed by tempering samples, mainly due to the differences in work hardening ability and strain rate sensitivity caused by different microstructures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Automation & Control Systems
Jacob Bultman, Christopher Saldana
Summary: This study investigates the influence of process parameters on the geometry of wire arc additive manufactured parts. The geometric accuracy of features produced with a weaving strategy is compared to that of a typical overlapping bead strategy. The results show that implementing a weave path strategy can improve the geometric accuracy of wire arc additive features, especially when using a low wavelength and high amplitude.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Industrial
Thomas Feldhausen, Narendran Raghavan, Kyle Saleeby, Lonnie Love, Thomas Kurfess
Summary: Hybrid manufacturing combines additive and subtractive manufacturing methods to reduce cycle time, increase elongation to failure, and decrease porosity, making it suitable for producing large complex components such as nosecones and marine propulsors.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Johannes Boes, Arne Roettger, Christian Mutke, Christoph Escher, Sebastian Weber
Summary: Laser additive manufacturing techniques allow for the production of complex-shaped parts. The cold crack susceptibility of carbon-martensitic tool steels limits their processability, but substrate preheating can mitigate this issue. However, preheating may have disadvantages for part quality and powder reusability. This study investigates a carbon-martensitic steel that can be manufactured without preheating to produce parts with low crack densities.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ulf Ziesing, Jonathan Lentz, Arne Roettger, Werner Theisen, Sebastian Weber
Summary: This study demonstrates the feasibility of crack-free processing of hot-work tool steels using metal-cored wires in wire-arc additive manufacturing. Increased interpass temperatures contribute to improved mechanical properties. High alloying content leads to segregation, but may be beneficial for applications at elevated temperatures.
Article
Materials Science, Multidisciplinary
Artem Alimov, Alexander Sviridov, Benjamin Sydow, Felix Jensch, Sebastian Haertel
Summary: In this study, hot-forming dies optimized for additive manufacturing were developed and produced using WA-DED and L-PBF technologies. The weight of each die was reduced by 56% by utilizing a lightweight lattice structure, and 17-4PH steel was used as a substitute for traditional materials. The workability of the manufactured dies was confirmed through industrial forging tests.
Article
Materials Science, Multidisciplinary
Seoung-Ho Lim, KenHee Ryou, Kyuseon Jang, Won Seok Choi, Hyuck Mo Lee, Pyuck-Pa Choi
Summary: In this study, the mechanism of hot cracking during direct laser deposition of D2 tool steels was investigated, revealing that cracks mainly formed in inter-dendritic regions and the crack size increased with the number of reheating events.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Alejandro Pereira, Diego Carou, Maria Fenollera, Teresa Prado, Bartosz Gapinski, Michal Wieczorowski
Summary: This research analyzed the geometry and surface topography of walls built under different conditions and inclination angles. The study found that travel speed and heat accumulation were important factors affecting the process efficiency. Additionally, intermediate cooling improved the uniformity of the structures.
Article
Materials Science, Multidisciplinary
Miao Song, Jingfan Yang, Xiang Liu, Laura R. Hawkins, Zhijie Jiao, Lingfeng He, Yongfeng Zhang, Daniel Schwen, Xiaoyuan Lou
Summary: Compositionally-graded austenitic 316L stainless steel samples with different Hafnium concentrations were additively manufactured and irradiated to evaluate void evolution. The results showed that the void size, density, and swelling decrease with increasing Hf concentration. Atom probe tomography revealed Hf dissolution in the matrix, supporting the use of microalloying to develop void swelling resistant materials.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ghazal Moeini, Ali Ramazani, Joerg Hildebrand, Christiane Roessler, Carsten Koenke
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2018)
Article
Construction & Building Technology
Joerg Hildebrand, Jean Pierre Bergmann
Article
Materials Science, Multidisciplinary
Philipp Henckell, Yarop Ali, Andreas Metz, Jean Pierre Bergmann, Jan Reimann
Article
Chemistry, Physical
Philipp Henckell, Maximilian Gierth, Yarop Ali, Jan Reimann, Jean Pierre Bergmann
Article
Construction & Building Technology
Jean Pierrel Bergmann, Jorg Lange, Jorg Hildebrand, Mathias Eiber, Maren Erven, Christof Gassmann, Chen-Hao Chiang, Claus Lenz, Thorsten Roder, Wais Bashariar
Article
Computer Science, Interdisciplinary Applications
Christian Busse, Ilya Tsivilskiy, Joerg Hildebrand, Jean Pierre Bergmann
Summary: A customized code using OpenFOAM software was developed to simulate an inductively coupled plasma torch, effectively coupling magnetic field analysis and plasma numerical simulation. The validation results were obtained and compared with literature data, showing good agreement with commercial CFD codes.
COMPUTERS & FLUIDS
(2021)
Article
Chemistry, Multidisciplinary
Jan Reimann, Stefan Hammer, Philipp Henckell, Maximilian Rohe, Yarop Ali, Alexander Rauch, Joerg Hildebrand, Jean Pierre Bergmann
Summary: This research presents a hybrid approach to generate sample data for future machine learning applications for the prediction of mechanical properties, which combines numerical simulation and experimental results to generate regression equations for accurate prediction. The validated numerical welding simulation model is able to achieve an accurate calculation of the t(8/5) cooling time, with an error of only 0.3%.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Civil
M. Kraus, P. Winkler, S. Hammer, J. Reimann, J. Hildebrand, J. P. Bergmann
Summary: The challenges in civil engineering and construction industries are increasing, and the need for sustainable utilization of resources is becoming more important. Modern constructions require optimized material applications and manufacturing processes. Additive manufacturing methods like Wire-Arc-Additive-Manufacturing (WAAM) offer new possibilities for producing individual and optimized solutions, especially in steel structures. Further research is needed to understand the effects of dimensional accuracy, surface finish, weld quality, and thermal influences on the structural behavior of corresponding members.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Manufacturing
Maximilian Rohe, Benedict Niklas Stoll, Joerg Hildebrand, Jan Reimann, Jean Pierre Bergmann
Summary: The paper presents a method to transfer the hearing of experienced welders into an automated testing process for in-line process control through processing sound information. Furthermore, research results demonstrate that deviations in shielding gas flow rates can be detected by using a convolutional neural network to process audio recordings.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2021)
Article
Engineering, Manufacturing
J. Lizarazu, L. Goebel, S. Linne, S. Kleemann, T. Lahmer, Ch. Roessler, J. Hildebrand
PROGRESS IN ADDITIVE MANUFACTURING
(2020)