Article
Metallurgy & Metallurgical Engineering
Zi-dong Lin, Kai-jie Song, Zhen Sun, Zi-qian Zhu, Xue-feng Zhao, Constantinos Goulas, Wei Ya, Xing-hua Yu
Summary: The use of TX-80 low-transformation-temperature (LTT) welding wire in manual overlay welding of 22SiMn2TiB armor steel has successfully addressed issues such as welding cracks, deformation, and residual stress, and ensured good strength and ductility requirements. Compared to the traditional ER 307Si welding wire, TX-80 LTT wire eliminates welding cracks and reduces welding deformation. However, it has lower impact toughness.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Jianhui Su, Yan Liu, Xiujing Peng, Guoxin Sun, Xuchuan Jiang
Summary: A two-step low-temperature calcination strategy was used to reduce the phase transformation temperature from γ-Al2O3 to α-Al2O3 and achieve good dispersion of α-Al2O3 particles.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Energy & Fuels
F. Vautard, E. Cakmak, M. Arnould, T. R. Watkins, R. Paul, H. Meyer III, J. Damron, N. Gallego, E. Lara-Curzio
Summary: In this study, the phase transformation and molecular structure evolution of petroleum-derived pitch were analyzed using in situ and ex situ experimental techniques. It was found that complementary experimental techniques can effectively describe complex mechanisms during the processing of organic materials.
Article
Optics
Bo Cheng, Dongjiang Wu, Kaojie Yue, Guangyi Ma, Fangyong Niu
Summary: Low-temperature cooling was applied in laser welding Hastelloy C-276/304 stainless steel with filler wire to improve the quality of the weld and enhance its corrosion resistance. The results show that low-temperature cooling can increase the cooling rate, solidification rate, and temperature gradient of the weld. Additionally, it has a positive effect on the microstructure optimization of the weld.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Steve Gaudez, Julien Teixeira, Sabine Denis, Guillaume Geandier, Sebastien Y. P. Allain
Summary: This study investigates the martensitic and nanobainite transformations in a low alloyed, high-Si steel. The martensite structure exhibits a mixed lath-plate morphology with a large scatter of sizes, while the bainite structure shows finer laths with more uniform sizes. The nanobainite study reveals that around two thirds of the carbon partitions from the ferrite to form transition iron carbides or enrich the austenite. Both processes occur rapidly but the ferrite remains supersaturated in carbon. The dislocation density increase in each new forming bainitic ferrite lath and then decreases as recovery becomes more significant.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Jinyi Liu, Daqiang Jiang, Zhiyuan Ma, Hui Zhang, Genfa Kang, Yuxuan Chen, Kaiyuan Yu, Yang Ren, Yinong Liu, Lei Ge, Lishan Cui
Summary: The mechanism of low thermal expansion in antiferromagnetic FeMn alloys is investigated through in-situ synchrotron X-ray diffraction. The results show that the coefficient of lattice thermal expansion decreases and the FWHM broadens during thermal cycling, indicating a reversible and isotropic evolution. The existence of premartensitic transformation is confirmed by additional reflection spots and dispersed martensite embryos observed in electron diffraction and TEM images. Similar phenomena are found in FeMn Invar alloy, suggesting a relation between the Invar effect and internal stress evolution caused by premartensitic transformation.
MATERIALS CHARACTERIZATION
(2022)
Article
Physics, Applied
Ravi Raj Purohit Purushottam Raj Purohit, Daniel Pepin Fowan, Elsa Thune, Stephan Arnaud, Gilbert Chahine, Nils Blanc, Olivier Castelnau, Rene Guinebretiere
Summary: This paper focuses on the continuous measurement of the crystallographic evolution in polycrystalline materials using high-resolution x-ray diffraction. Through observing the structure changes at high temperatures, the characteristics of reciprocal space node splitting and scattering signal evolution during phase transitions are explored.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. Donoghue, J. R. Kennedy, N. Byres, P. B. Prangnell
Summary: In-situ cooling experiments were conducted on Ti64 samples for the first time, revealing the development of alpha colonies. Primary alpha laths play a crucial role in influencing subsequent colony growth and transformation process by nucleating secondary alpha laths through sympathetic autocatalysis.
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Myeong-heom Park, Reza Gholizadeh, Ranjit Kumar Ray, Mitsuhiro Murayama, Nobuhiro Tsuji
Summary: Low-carbon multi-phased steels with transformation induced plasticity (TRIP) effect have attracted significant attention for automotive applications due to their superior mechanical balance between strength and ductility. However, the complex microstructural evolutions during thermo-mechanical processing and the influence of constituent phases on mechanical properties have not been fully understood. In this study, the formation process of multi-phased microstructures in a low alloy steel during intercritical annealing and subsequent partitioning heat-treatment were systematically investigated. The phase fractions of ferrite, martensite, and retained austenite were found to change significantly with increasing holding time at lower temperature. Newly formed ferrite was observed to transform from austenite through massive or bainitic transformation, resulting in different types of ferrite in the final microstructures. The presence of retained austenite was attributed to interstitial carbon diffusion, leading to improved tensile elongation and TRIP effect during deformation. The best strength-ductility balance was achieved with the shortest heat-treatment at lower temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Xiaohui Bian, Ludek Heller, Ondrej Tyc, Lukas Kaderavek, Petr Sittner
Summary: This study addresses the unanswered questions regarding superelastic deformation of NiTi wires, including the texture and microstructure of stress induced martensite, the transformation process of austenite to martensite, and the deformation mechanisms at different temperatures. Experimental results reveal distinct differences in superelasticity and plastic deformation mechanisms at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
T. N. Vershinina, N. Yu. Samoylova, S. V. Sumnikov, A. M. Balagurov, V. V. Palacheva, I. S. Golovin
Summary: The evolution in phase composition of as-cast Fe-Ga alloys during continuous heating and subsequent cooling was studied, and distinct stages of phase formation were identified based on neutron diffraction analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Andrew Martin, Boyce S. Chang, Martin Thuo
Summary: The role of surface structure/composition in altering solidification behavior is demonstrated by studying the undercooling of core-shell metal particles. The study reveals the importance of autonomous surface speciation in the passivating oxide, which affects the relaxation of molten metal. The concentration and composition of oxidizing species across the thickness of the oxide layer play a critical role in this process. Under oxidizing conditions, factors such as reduction potential, curvature, and surface plasticity dictate the spatial order and concentration of the oxidizing species. This research expands our understanding of nucleation theory and has implications for the development of low-temperature solders.
ACS APPLIED NANO MATERIALS
(2022)
Article
Polymer Science
Tyler Eastmond, Jing Hu, Vahidreza Alizadeh, Rostislav Hrubiak, Jay Oswald, Alireza Amirkhizi, Pedro Peralta
Summary: Polyurea, an elastomer with a phase-segregated microstructure, was studied under high pressure using multi-angle energy-dispersive X-ray diffraction experiments. The results indicate compression between hard segments and an increase in π-stacking separation between soft segments under pressure.
Article
Engineering, Manufacturing
Tiago A. Rodrigues, J. D. Escobar, Jiajia Shen, Valdemar R. Duarte, G. G. Ribamar, Julian A. Avila, Emad Maawad, Norbert Schell, Telmo G. Santos, J. P. Oliveira
Summary: This study investigates the precipitation kinetics of secondary phases and the dissolution of delta-ferrite in 316 L stainless steel walls fabricated by WAAM through heat treatments and synchrotron X-ray diffraction measurements. The research found a direct relationship between the amount of delta-ferrite and hardness values in the fabricated parts.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Wu Gong, Stefanus Harjo, Yo Tomota, Satoshi Morooka, Takuro Kawasaki, Akinobu Shibata, Nobuhiro Tsuji
Summary: The martensitic transformation is accompanied by the generation of internal stresses at both microscale and macroscale during cooling. Previous studies using X-ray or neutron diffraction have reported inconsistent results due to the influence of factors such as solute elements and crystal defects on the measured lattice parameter.
Article
Materials Science, Multidisciplinary
Itziar Serrano-Munoz, Tobias Fritsch, Tatiana Mishurova, Anton Trofimov, Daniel Apel, Alexander Ulbricht, Arne Kromm, Rene Hesse, Alexander Evans, Giovanni Bruno
Summary: The relationship between residual stresses and microstructure of a laser powder bed fusion (LPBF) IN718 alloy was investigated. Different scanning strategies resulted in different residual stress distribution and deformation on the specimens. It was found that a significant amount of residual stress remains in the specimens even after their removal from the baseplate.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Engineering, Manufacturing
Naresh Nadammal, Tatiana Mishurova, Tobias Fritsch, Itziar Serrano-Munoz, Arne Kromm, Christoph Haberland, Pedro Dolabella Portella, Giovanni Bruno
Summary: This study investigated four different scan strategies and their impact on microstructure, texture, and residual stresses in laser powder bed fusion additive manufacturing of Inconel 718. The results showed that manipulating scan strategies can effectively control the development of microstructure, texture, and residual stresses, leading to lower distortions in the fabricated components.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Itziar Serrano-Munoz, Alexander Ulbricht, Tobias Fritsch, Tatiana Mishurova, Arne Kromm, Michael Hofmann, Robert C. Wimpory, Alexander Evans, Giovanni Bruno
Summary: The influence of different scan strategies on the residual stress state of an as-built IN718 alloy produced by LPBF was investigated in this study. It was found that long scan vector strategies result in higher residual stress compared to short scan vector strategies, and 67 degrees-rotation strategies generate lower residual stress compared to 90 degrees-alternation strategies. Neutron diffraction and X-ray diffraction techniques revealed significant spatial non-uniformity in residual stress distribution.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
D. Schroepfer, A. Kromm, T. Lausch, M. Rhode, R. C. Wimpory, T. Kannengiesser
Summary: For the modified 13CrMoV9-10 steel developed for petrochemical plants, extreme care is required during the welding process due to its low toughness, high strength, and susceptibility to stress relief cracking. Research focuses on the effects of welding heat control on residual stresses and discusses the transferability of results.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Itziar Serrano-Munoz, Alexander Evans, Tatiana Mishurova, Maximilian Sprengel, Thilo Pirling, Arne Kromm, Giovanni Bruno
Summary: The residual stress in laser powder bed fusion (LPBF) IN718 alloy samples produced using a 67 degrees-rotation scan strategy was investigated via laboratory X-ray diffraction (XRD) and neutron diffraction (ND), showing significant non-uniformity and difficulty in accurate determination through the stress balance method.
ADVANCED ENGINEERING MATERIALS
(2022)
Correction
Metallurgy & Metallurgical Engineering
A. Kromm, T. Lausch, D. Schroepfer, M. Rhode, T. Kannengiesser
WELDING IN THE WORLD
(2021)
Correction
Metallurgy & Metallurgical Engineering
A. Kromm, T. Lausch, D. Schroepfer, M. Rhode, T. Kannengiesser
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Maximilian Sprengel, Gunther Mohr, Simon J. Altenburg, Alexander Evans, Itziar Serrano-Munoz, Arne Kromm, Thilo Pirling, Giovanni Bruno, Thomas Kannengiesser
Summary: This study focuses on the distribution of bulk triaxial RS and surface RS in LPBF austenitic steel 316L. It highlights the benefit of using multiple RS determination methods and in situ thermography monitoring to characterize the RS in LPBF processed parts.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
M. Sprengel, A. Ulbricht, A. Evans, A. Kromm, K. Sommer, T. Werner, J. Kelleher, G. Bruno, T. Kannengiesser
Summary: This study investigates the effect of different heat treatment temperatures on residual stresses in 316L stainless steel samples, finding that residual stresses almost completely vanish after 1-hour treatment at 900 degrees Celsius, which is closely related to the evolution of the subgrain solidification cellular microstructure.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Jakob Schroeder, Alexander Evans, Tatiana Mishurova, Alexander Ulbricht, Maximilian Sprengel, Itziar Serrano-Munoz, Tobias Fritsch, Arne Kromm, Thomas Kannengiesser, Giovanni Bruno
Summary: Residual stresses generated during laser-based additive manufacturing can lead to distortion or cracking of parts, emphasizing the importance of understanding their magnitude and spatial distribution for mitigation strategies. Diffraction-based methods offer a non-destructive way to determine these stresses, while the unique microstructures and textures associated with laser-based additive manufacturing processes present metrological challenges.
Article
Materials Science, Multidisciplinary
Arne Kromm, Maximilian Thomas, Thomas Kannengiesser, Jens Gibmeier, Florian Vollert
Summary: The article introduces a new method for assessing the susceptibility of materials to solidification cracking during welding. By calculating the ratio of the measured crack length to the maximum possible value, the method overcomes the limitations of traditional methods and allows for comparison of different welding parameters. The experimental results are consistent with the hot cracking model.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ronny Scharf-Wildenhain, Andre Haelsig, Jonas Hensel, Karsten Wandtke, Dirk Schroepfer, Arne Kromm, Thomas Kannengiesser
Summary: This study focuses on the influence of process parameters on cooling time, mechanical properties, and residual stresses of high-strength filler materials in wire arc additive manufacturing (WAAM). It provides insights into the safe avoidance of cold cracking and offers processing recommendations for economical WAAM of high-strength steels.
Article
Metallurgy & Metallurgical Engineering
K. Wandtke, D. Schroepfer, R. Scharf-Wildenhain, A. Haelsig, T. Kannengiesser, A. Kromm, J. Hensel
Summary: Wire arc additive manufacturing (WAAM) enables efficient production of weight-optimized engineering structures. However, the lack of knowledge and guidelines regarding welding residual stress and component safety limits its industry applications.
WELDING IN THE WORLD
(2023)
Article
Materials Science, Multidisciplinary
Becker Amadeus, Schroepfer Dirk, Kromm Arne, Kannengiesser Thomas
Summary: During the assembly of steel structures, unacceptable weld defects may be found. An economical solution is local thermal gouging of the affected areas and re-welding. However, due to high shrinkage restraints and degraded microstructure and mechanical properties, cracking and component failure may occur. Component-related investigations focus on welding residual stress evolution during local thermal gouging and rewelding.
FORCES IN MECHANICS
(2022)
Proceedings Paper
Engineering, Multidisciplinary
D. Schroepfer, R. Scharf-Wildenhain, A. Haelsig, K. Wandtke, A. Kromm, T. Kannengiesser
Summary: This study focuses on the interactions between process parameters, resulting layer geometry, microstructure, and residual stresses in high-strength fine-grained structural steels during wire arc additive manufacturing (WAAM). The aim is to achieve an economical, fit-for-purpose, and crack-safe WAAM of high-strength steels through the investigation of process- and material-related influences, as well as design-related restraint conditions associated with residual stresses and cold cracking risk.
22ND CHEMNITZ SEMINAR ON MATERIALS ENGINEERING - 22. WERKSTOFFTECHNISCHES KOLLOQUIUM (WTK 2021)
(2021)
