Article
Materials Science, Multidisciplinary
Rong Ma, Tingyi Liu, Guichao Hu, Jun Wu, Zhiyong Ren, Dong Chen, Yufei Li, Chao Luo
Summary: Different solidification techniques were used to achieve a wide range of cooling rates, revealing that as the cooling rate increased, the average grain size decreased and inclusion evolution behavior became finer. The nanoindentation test showed that niobium segregation significantly influenced the mechanical properties of the dendrite arms and interdendritic regions.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Crystallography
Andras Roosz, Arnold Ronafoldi, Yuze Li, Nathalie Mangelinck-Noel, Gerhard Zimmermann, Henri Nguyen-Thi, Maria Sveda, Zsolt Veres
Summary: In this study, solidification experiments were conducted on the International Space Station to investigate the effect of solidification parameters on the grain structure and dendritic microstructure of Al-Si alloy. The analysis also focused on the macrosegregation caused by diffusion and the distribution of eutectic along the solidification direction. The results showed good agreement between the experimental and simulated data.
Article
Materials Science, Multidisciplinary
Luciano Eliezer Ramirez-Vidaurri, Manuel Castro-Roman, Martin Herrera-Trejo, Karla-Leticia Fraga-Chavez
Summary: The solidification evolution of an ASTM F75 alloy during directional cooling was studied, revealing that the solid grows most rapidly in a temperature range of approximately 200 degrees Celsius, reaching a solid fraction of about 0.8-0.9, with the coarsening of Secondary Dendrite Arm Spacing (SDAS) mainly occurring during this period.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Christian Gawert, Ruediger Baehr
Summary: A new procedure for automatic measurement of SDAS from microscopic images is introduced and successfully applied to two hypoeutectic aluminum cast alloys, showing good agreement between automated and manually measured values. A decrease in computation time allowed for an increase in measurement density for characterizing microstructures.
Article
Metallurgy & Metallurgical Engineering
Guo Dongwei, Guo Kunhui, Zhang Fuli, Zhang Fei, Cao Jianghai, Hou Zibing
Summary: High-end steel products are important for economic development and infrastructure projects. Continuous casting is an important production process for these products, but internal segregation defects can affect their quality and properties. This study focuses on the determination of columnar to equiaxed transition (CET) in the solidification structure of continuous casting billets. By measuring and analyzing the secondary dendrite arm spacing (SDAS), the researchers found a mutation of SDAS during the solidification process. Based on this mutation, they proposed a new method for quantitatively determining CET in continuous casting billets.
ACTA METALLURGICA SINICA
(2022)
Article
Materials Science, Multidisciplinary
Kaili Cao, Wenchao Yang, Jiachen Zhang, Chen Liu, Pengfei Qu, Haijun Su, Jun Zhang, Lin Liu
Summary: The solidification characteristics and as-cast microstructures of a Ru-containing nickel based single crystal superalloy were systematically studied through various experiments and analysis methods. The main focus was on analyzing the solidification transition temperature, segregation behavior, solidification path, microstructure evolution, and phase formation mechanism.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Xiaoping Ma, Hongwei Liu, Paixian Fu, Dianzhong Li
Summary: The study investigated the microstructures and segregations during solidification, revealing nano-scale dendrites within conventional dendrites. Conventional dendrites should be viewed as macrosegregation patterns in a subtle porous media, leading to a shift in research focus for microsegregation. Temperature fluctuations induce dendritic temperature field on multi-scales, resulting in dendritic macrosegregation field induced by mass transfer. In situ observation confirmed the emergence of subtle dendrites at lower temperatures than equilibrium eutectic temperature, leading to new solutions for controlling macrosegregation within conventional dendritic arm. The nano-scale dendrites provide the basis for unifying non-equilibrium and equilibrium solidification.
MATERIALS & DESIGN
(2021)
Article
Metallurgy & Metallurgical Engineering
Zhi-Yu He, Hua-Bing Li, Zhuo-Wen Ni, Hong-Chun Zhu, Zhou-Hua Jiang, Hao Feng, Dong-Sheng Mao
Summary: The research indicates that increasing pressure mainly refines SDAS by enlarging cooling rate. Pressurization can enhance columnar dendrite tip growth rate by increasing undercooling and inhibit equiaxed dendrite nucleation and growth by decreasing constitutional undercooling. The formula for calculating columnar dendrite tip growth rate with undercooling is suitable for low pressure (<= 2 MPa).
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Crystallography
Viacheslav Balobanov, Matti Lindroos, Tom Andersson, Anssi Laukkanen
Summary: This paper investigates the micromechanical performance of grey cast irons using numerical modeling based on crystal plasticity theory. It introduces a cleavage damage model and includes temperature dependence in material parameters, showing good agreement with experimental tests.
Article
Materials Science, Multidisciplinary
En Li, Changsheng Li, Yahui Han, Jinyi Ren, Cairu Gao, Chunlin Qiu
Summary: The study of dendrite structure and hardness of 4Cr5MoSiV1 ingot under different homogenisation processes showed that two-stage homogenisation treatments at higher temperature were more effective than single-stage treatment, with the treatment of 800 degrees C/3 h + 1200 degrees C/1 h showing the best homogenisation effect.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yeqing Wang, Xuan Chen, Xiao Shi, Zhe Xu, Yu Fan, Liang Wang, Zheng Chen
Summary: This study designed and characterized a near-eutectic Fe2-yCoNiCryCx high entropy cast iron. It was found that the addition of carbon changed the alloy composition from hypoeutectic to hypereutectic, leading to a transition from FCC phase to M7C3 carbide as the primary phase. The addition of chromium transformed the phase constituent from a mixture of FCC, M7C3, and graphite to only FCC and M7C3. The Fe1.2CoNCr0.8C0.45 high entropy cast iron exhibited superior properties with an ultimate strength of 1934 MPa and an elongation rate of 21.3%, mainly due to the strengthening mechanism induced by the precipitation of M7C3 carbide with a higher fraction.
Article
Nanoscience & Nanotechnology
X. Wang, W. Zhai, J. Y. Wang, B. Wei
Summary: The solidification process of high-entropy FeCoNi2Al0.9 alloy was modulated using 20 kHz power ultrasound with a maximum amplitude of 13 μm. The eutectic structures were composed of L12 and B2 phases growing synergistically by the K-S relationship. Increasing the ultrasound amplitude resulted in refined eutectic cell width and regular lamellar spacing, increased proportion of strictly semi-coherent L12/B2 interfaces, and suppressed solute concentration fluctuation in each eutectic phase. The steady-state cavitation and acoustic flow had a significant influence on the evolution of the eutectic microstructure. The alloy exhibited increased yield strength, ultimate strength, and total elongation compared to statically solidified alloy, providing an effective approach to improve the mechanical properties and overcome the strength-ductility trade-off in high-entropy alloys with eutectic structures.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
S. Koskenniska, A. Kaijalainen, T. Pikkarainen, S. Mehtonen, D. Porter, J. Komi
Summary: The study investigated the effect of as-cast structure and macrosegregation on the mechanical properties of a low-alloy martensitic ultrahigh-strength aluminum killed and calcium treated steel cast at different superheats. It was found that higher superheat led to more intense interdendritic segregation, causing pronounced positive segregation in specific zones. Hot-rolled samples showed local variations in hardness correlated with carbon content variations, and the CET zone had a tendency to reduce impact toughness values.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
N. Hou, J. W. Xian, A. Sugiyama, H. Yasuda, C. M. Gourlay
Summary: In this study, we investigated the morphology transitions of the β-Sn + Ag3Sn eutectic at increasing growth velocity. The orthorhombic Ag3Sn grew as faceted plates or rods with [010] growth direction and (001) as the largest facet in three eutectic growth morphologies. Reproducible β-Sn + Ag3Sn orientation relationships were observed in the latter two morphologies. The mechanisms of spacing adjustment and the reversible transition from plate to rod growth were studied for transient solidification after velocity changes.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Review
Materials Science, Multidisciplinary
Chandra Sekhar Tiwary, Prafull Pandey, Suman Sarkar, Rakesh Das, Sumanta Samal, Krishanu Biswas, Kamanio Chattopadhyay
Summary: Eutectic alloys, particularly in the development of complex microstructures, show promise for being used as high-strength structural materials in engineering applications. The emergence of ultrafine eutectics and multiscale variation highlights their potential for future use in high-temperature applications.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Rohollah Ghasemi, Inamul Hassan, Arvin Ghorbani, Attila Dioszegi
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Metallurgy & Metallurgical Engineering
A. K. Ramos, A. Dioszegi, W. L. Guesser, C. S. Cabezas
INTERNATIONAL JOURNAL OF METALCASTING
(2020)
Article
Metallurgy & Metallurgical Engineering
Juan Carlos Hernando, Ehsan Ghassemali, Arne K. Dahle, Attila Dioszegi, Jessica Elfsberg
INTERNATIONAL JOURNAL OF METALCASTING
(2020)
Article
Metallurgy & Metallurgical Engineering
Bjorn Domeij, Attila Dioszegi
INTERNATIONAL JOURNAL OF METALCASTING
(2020)
Article
Metallurgy & Metallurgical Engineering
Kristin Hellstrom, Vaslie-Lucian Diaconu, Attila Dioszegi
Correction
Metallurgy & Metallurgical Engineering
Kristina Hellstrom, Vasile-Lucian Diaconu, Attila Dioszegi
Article
Metallurgy & Metallurgical Engineering
Judit Svidro, Attila Dioszegi, Jozsef Tamas Svidro
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
(2020)
Article
Nanoscience & Nanotechnology
Vasilios Fourlakidis, Pal Schmidt, Anders E. W. Jarfors, Peter Svidro, Attila Dioszegi
Summary: The study found that the microstructure parameters of lamellar graphite iron are closely related to the fatigue limit, with cooling conditions and solidification time significantly affecting fatigue strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Dinesh Sundaram, Jozsef Tamas Svidro, Attila Dioszegi, Judit Svidro
Summary: Gas permeability of moulds and cores is crucial in the casting process. This study introduces a custom-made measurement system and compares results using different calculation methods.
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
(2021)
Article
Chemistry, Physical
Dinesh Sundaram, Jozsef Tamas Svidro, Judit Svidro, Attila Dioszegi
Summary: Furan sand is a commonly used chemically bonded molding material in foundries worldwide, with its gas permeability playing a crucial role in the quality of molds and cores. This paper introduces a new method using Darcy's law to measure the gas permeability of furan sand samples with different grain size distributions, and correlates the permeability values with mercury-porosity measurement results to shed light on the relationship between pore size, pore volume, and the permeability of molding materials.
Article
Metallurgy & Metallurgical Engineering
Bjorn Domeij, Ilja Belov, Vasilios Fourlakidis, Attila Dioszegi
Summary: This paper presents and validates a methodology for implementing full-scale sand-casting simulation in a general-purpose finite element software, covering mold filling, heat transport, solidification kinetics, chemical microsegregation, and the prediction of microstructure and material properties. The customized solidification model for gray cast iron includes innovative methods to handle the interaction between parallel dendritic and eutectic solidification modes, and its impact on the final microstructure. The validation process involves comparing simulated and experimental cooling curves, microstructure parameters, and tensile strength using a previously published experiment on gray iron casting. This research is valuable for researchers and engineers aiming to enhance the capabilities of casting simulation tools.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Metallurgy & Metallurgical Engineering
Vasilios Fourlakidis, Juan Carlos Hernando, Daniel Holmgren, Attila Dioszegi
Summary: Improved mechanical and thermal properties are important for enhancing the performance of cast iron components operating at elevated temperatures. Microstructural features that increase thermal conductivity have a negative impact on tensile strength, resulting in a unique inverse relationship between these two properties. This finding highlights the challenges in simultaneously improving these properties and provides a guideline for designing cast iron components for high temperature applications.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Materials Science, Multidisciplinary
Bjorn Domeij, Jessica Elfsberg, Attila Dioszegi
Summary: Shrinkage defects are common problems in metal cast components. Understanding the evolution of the dendritic structure in cast alloys is important due to its impact on mechanical properties. In this study, the dendritic austenite structure was investigated in compacted graphite iron solidified under different cooling conditions. Higher cooling rates promoted a more coherent dendritic austenite structure and increased its volume fraction. The growth of both new dendrites and thickening of existing dendrites contributed to the increase in dendritic austenite.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
He Tan, Vladimir Tarasov, Vasileios Fourlakidis, Attila Dioszegi
FUZZY SYSTEMS AND DATA MINING VI
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Judit Svidro, Jozsef Tamas Svidro, Attila Dioszegi
4TH INTERNATIONAL CONFERENCE ON RHEOLOGY AND MODELING OF MATERIALS (IC-RMM)
(2020)
