Article
Engineering, Manufacturing
Emil Strandh, Pelle Mellin, Sophie Dubiez-Le Goff, Johannes Gardstam, Magnus Ahlfors, Annika Strondl
Summary: This study found that the argon content near the surface of the AM-material increased significantly during HIP, while the bulk content remained unchanged. Rough surfaces, time in HIP, and oxidised surfaces prior to HIP were all found to aggravate argon pick-up. Therefore, critical components should be machined, blasted, ground, or polished after HIP, or possess non-oxidised surfaces prior to HIP to mitigate any risk of a decline in material performance.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Zehao Qin, Nan Kang, Huajing Zong, Chunhui Zhan, Yanbo Fang, Zihong Wang, Mohamed El Mansori, Jing Chen, Xin Lin, Weidong Huang
Summary: This study applies hot isostatic pressing (HIP) to enhance the fatigue properties of L-PBFed alloys by healing porosities and promoting oxidation, highlighting the critical role of oxides in fatigue performance.
MATERIALS RESEARCH LETTERS
(2022)
Article
Engineering, Manufacturing
Anton du Plessis, Nima Razavi, Di Wan, Filippo Berto, Adam Imaddadulah, Chad Beamer, James Shipley, Eric MacDonald
Summary: Additive manufacturing of metal components is widely used in high performance applications, particularly in the aerospace industry. Laser powder bed fusion is the most commonly used process, but it has some challenges. Hot isostatic pressing has emerged as a key technology for post-processing metal components and improving fatigue properties.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Hongzhuang Zhang, Changyou Li, Guo Yao, Yimin Zhang
Summary: This paper comprehensively investigated the material characteristics, mechanical properties, and deformation behaviors of LPBF 304L austenitic stainless steel subjected to HIP process with different temperatures. The experimental results showed that increasing HIP temperature led to increased grain size, inclusion size, recrystallization fraction, and dimple size, resulting in homogenized microstructure, reduced yield strength and microhardness, and significantly improved ductility. Furthermore, the study revealed the influence of porosity, inclusion, residual stress, and dislocation density on the fatigue life of HIP-treated samples after surface post-treatment.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Yaoxin Huo, Zhengguan Lu, Min Cheng, Jinping Fan, Junwei Qiao, Lei Xu, Ruipeng Guo, Rui Yang, P. K. Liaw
Summary: This study presents the first investigation on the dwell-fatigue behavior and damage mechanism of as-HIPed Ti-6Al-4V powder compact. The results show that the peak stress and stress ratio have significant effects on dwell fatigue behavior. A crack-initiation and propagation model based on soft-hard grain pairs has been proposed to explain the dwell-fatigue mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Siyuan Qin, Simone Herzog, Anke Kaletsch, Christoph Broeckmann
Summary: Laser additive manufacturing allows for the efficient production of complex parts, but the presence of pores and carbide networks in the laser powder-bed fusion (LPBF) process can reduce fatigue strength. Hot isostatic pressing (HIP) with integrated heat treatment effectively densifies the material and alters its microstructure, leading to improved fatigue strength. Research findings demonstrate that the HIP process significantly enhances the fatigue strength of the samples.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Zhibo Hao, Tian Tian, Xinggang Li, Yuhe Huang, Shiqing Peng, Qiang Zhu, Changchun Ge
Summary: This study investigated the effects of heat treatment on the microstructure and mechanical properties of a nickel-based superalloy prepared by LPBF. The results showed that both HIP and HT processes improved the alloy's structure and properties, while an increase in HIP temperature led to grain refinement and elimination of some structural defects.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Amine Hattal, Kamilla Mukhtarova, Madjid Djemai, Thierry Chauveau, Azziz Hocini, Jean Jacques Fouchet, Brigitte Bacroix, Jeno Gubicza, Guy Dirras
Summary: This study discusses the effects of hot isostatic pressing (HIP) post-treatment on Laser Powder Bed Fusion of Ti6Al4V and Ti6Al4V reinforced with nano-yttria-stabilized zirconia (nYSZ). The results show that HIP post-treatment increases the density and grain thickness, decreases microhardness and yield stress, and enhances plastic strain.
MATERIALS & DESIGN
(2022)
Article
Engineering, Manufacturing
Hui Wang, Liu Chen, Bogdan Dovgyy, Wenyong Xu, Aixue Sha, Xingwu Li, Huiping Tang, Yong Liu, Hong Wu, Minh-Son Pham
Summary: This study analyzed literature data to identify optimized print parameters and evaluated the consolidation, microstructure, and mechanical properties of Hastelloy-X printed by laser powder bed fusion. The results showed that hot-isostatic pressing (HIP) was more effective in removing internal micro-cracks and pores, as well as optimizing mechanical properties through recrystallization and precipitation compared to annealing.
ADDITIVE MANUFACTURING
(2021)
Article
Nanoscience & Nanotechnology
Xiaohui Liu, Yunzhong Liu, Zhiguang Zhou, Huan Zhong, Qiangkun Zhan
Summary: A combination manufacturing strategy of functional treatment, inoculation treatment, and hot isostatic pressing (HIP) post-processing was used to tackle the issues of hot cracks and pores in high-strength aluminum alloy fabrication. HIP treatment can fill pores, control precipitates, and reduce the performance difference between high-speed and low-speed printed alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
I. S. Grech, J. H. Sullivan, R. J. Lancaster, J. Plummer, N. P. Lavery
Summary: This study compares the mechanical and corrosion properties of 316L steel manufactured by LPBF and post treated by HIP to wrought 316L. The research finds that HIP parameters play a crucial role and high temperatures can reduce mechanical strength and corrosion resistance. Microstructural features associated with LPBF disappear with longer and higher temperature treatments, resulting in increased grain sizes. Low and mid temperature HIP treatments improve ultimate tensile strength but lower fracture elongation. Porosity has the most influential role on pitting corrosion.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Nicholas Derimow, Jake T. Benzing, Keenan Hanson, Nikolas Hrabe
Summary: A globular alpha recrystallization has been found on the surface of net shape electron beam powder-bed fusion (PBF-EB) Ti-6Al-4V alloy parts. This recrystallization is a result of powder recovery blasting and hot isostatic pressing treatment (HIP), simulating the thermomechanical treatment required for globularization in wrought Ti-6Al-4V. The thickness of the globular surface alpha layer varies depending on the blasting intensity and the presence of surface protrusions. Controlled blasting parameters and globular surface layer thickness could potentially create tunable fatigue and wear performance.
Article
Nanoscience & Nanotechnology
Derui Jiang, Yang Tian, Yuman Zhu, Shuai Huang, Aijun Huang
Summary: This study demonstrates the feasibility of using a core-shell approach combined with hot isostatic pressing (HIP) to improve the productivity of laser powder bed fusion (LPBF) process for producing Hastelloy-X (HX) components. The core-shell HX with HIP treatment shows a grain size gradient from shell to core, leading to better mechanical properties compared to the HX without the core-shell structure. Moreover, the core-shell approach significantly improves the LPBF production rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhaotong Yang, Mei Yang, Richard Sisson, Yanhua Li, Jianyu Liang
Summary: A machine-learning model was established to predict the influence of post-treatment HIP parameters on the tensile properties of LPBF Ti6Al4V parts. The model showed high accuracy in predicting Yield Strength and Ultimate Tensile Strength, but lower accuracy in predicting strain to failure.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
K. Pandian, M. Neikter, F. Bahbou, A. Ganvir, T. Hansson, R. Pederson
Summary: Ti-6Al-4V, a high specific strength titanium alloy, is widely used in fan and compressor modules of gas turbine engines. The fatigue life of Ti-6Al-4V components manufactured using electron beam powder bed fusion (PBF-EB) process is improved by hot isostatic pressing (HIP) treatment. A low-temperature HIP treatment is performed at about 800°C to limit the impact on static mechanical properties. This study evaluates the fatigue behavior of such a modified HIP-treated material and compares it with the standard HIP-treated material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Siyuan Qin, Simone Herzog, Anke Kaletsch, Christoph Broeckmann
Summary: Laser additive manufacturing allows for the efficient production of complex parts, but the presence of pores and carbide networks in the laser powder-bed fusion (LPBF) process can reduce fatigue strength. Hot isostatic pressing (HIP) with integrated heat treatment effectively densifies the material and alters its microstructure, leading to improved fatigue strength. Research findings demonstrate that the HIP process significantly enhances the fatigue strength of the samples.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Christian Gebhardt, Jiali Zhang, Alexander Bezold, Christoph Broeckmann
Summary: This study provides a deeper understanding of the microscale fatigue mechanisms in high silicon alloyed nodular cast iron. It reveals the significant influence of graphite morphology on crack initiation and the grain orientation dependent crack propagation mechanisms.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Metallurgy & Metallurgical Engineering
Gezhou Wang, Yuanbin Deng, Frank Adjei-Kyeremeh, Jiali Zhang, Iris Raffeis, Andreas Buehrig-Polaczek, Anke Kaletsch, Christoph Broeckmann
Summary: In this study, various computational fluid dynamics models were used to simulate the gas atomisation process. The results show that a reasonable mass median diameter of the particle can be predicted numerically, and there is a clear relationship between the breakup trajectory and the resulting particle size.
Article
Chemistry, Physical
Fabian Meyer, Fabian Kolodzy, Marie Luise Scheck, Anke Kaletsch, Tetiana Kharandiuk, Andrij Pich, Christoph Broeckmann
Summary: In order to expand the range of alloys that can be processed by laser-based powder bed fusion, reinforced alloys have been the focus of attention. The satelliting method, which uses a bonding agent to add fine additives to larger parent powder particles, was introduced to prevent local demixing caused by size and density effects. This study investigates the use of the satelliting method with a functional polymer binder (pectin) to add Cr3C2 to AISI H13 tool steel. The results suggest that pectin is a suitable binder for the satelliting process, reducing the demixing behavior observed in simple powder blends. However, the alloy becomes enriched with carbon, resulting in the retention of austenite. Further research will explore the use of a reduced binder content.
Article
Chemistry, Physical
Anke Kaletsch, Siyuan Qin, Christoph Broeckmann
Summary: This study investigates the influence of different build orientations and two different heat treatment conditions on the creep properties of additively manufactured Inconel 718 alloy. The results show that the build direction has a slight influence on the creep properties, while the heat treatment conditions have a more significant impact. The specimens subjected to hot isostatic pressing (HIP) treatment exhibit better creep resistance than those treated with solution annealing at 980 degrees C followed by aging.
Article
Chemistry, Physical
Anke Kaletsch, Markus Sondermann, Markus Mirz, Felix Radtke, Christoph Broeckmann
Summary: Laser-based additive manufacturing is a promising technology for producing parts with complex geometries. Hot isostatic pressing (HIP) is often used to enhance the strength and reliability of parts produced via powder bed fusion with laser beam (PBF-LB). This study investigates the influence of argon and nitrogen as process gases on the properties of duplex AISI 318LN steel after PBF-LB and HIP, focusing on high initial porosities.
Article
Biochemistry & Molecular Biology
Simone Herzog, Anke Kaletsch, Christoph Broeckmann
Summary: This study examines the effect of different materials on the gas-ceramic joints in the oxygen separation process. It is found that coating with NiCoCrAlReY can significantly improve the strength of the joints and reduce the occurrence of defects.
Article
Materials Science, Ceramics
Chao Liu, Mathias Herrmann, Yuanbin Deng, Anke Kaletsch, Christoph Broeckmann
Summary: The uniaxial viscosity, which is affected by temperature, relative density, and grain size, plays a crucial role in understanding material densification during the sintering process. In this study, bending creep tests are conducted on pre-sintered 3Y-TZP specimens with varying relative densities and grain sizes to determine the uniaxial viscosity and its dependence on these factors. It is found that the uniaxial viscosity decreases with temperature, and the tetragonal to cubic phase transformation at high temperatures reduces the activation energy. The contributions of densification and grain growth to the increase in uniaxial viscosity are quantitatively determined.
CERAMICS INTERNATIONAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Chao Liu, Atilim Eser, Siegward Heintze, Frank Rothbrust, Christoph Broeckmann
Summary: This study aimed to predict the lifetime and fracture probability of anterior crowns made of different materials under cycling loading. Viscoelastic parameters were measured through three-point bending tests and used to compute residual stresses and cyclic loading on the crowns, with results indicating the methodology's potential for material performance prediction.
Article
Materials Science, Ceramics
Christina Klug, Simone Herzog, Anke Kaletsch, Christoph Broeckmann, Thomas H. Schmitz
Summary: This study explores how the plasticity of ceramic composite material can be utilized in a new integrated design and manufacturing process by adding soft magnetic particles and controlling, stabilizing, and shaping it through magnetic fields.
CERAMICS-SWITZERLAND
(2022)
