Article
Materials Science, Multidisciplinary
Zhaozhen Cai, Jiazhi An, Biao Cheng, Miaoyong Zhu
Summary: Austenitic grain size is an important factor affecting the hot ductility of steel slabs during continuous casting. The increase in austenite grain size decreases the volume fraction of film-like proeutectoid ferrite and the average diameter of Nb(C, N) precipitates, leading to strain concentration and a decrease in hot ductility.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Vikash Kumar Sahu, Snehashish Tripathy, Sandip Ghosh Chowdhury, Gopi Kishor Mandal
Summary: The significance of local equilibria (LE) models in understanding phase transformations in multicomponent steels has been revisited and the necessity for a firsthand computational tool capable of estimating metastable ferrite-austenite and cementite-austenite phase boundaries along with possible LE modes has been realized. For this purpose, thermodynamically consistent Unified Interaction Parameter Formalism (UIPF) has been adopted owing to its computational simplicity. The UIPF-based framework has been shown to be a computationally simple yet efficient tool for prediction of metastable phase boundaries at low temperatures and wide composition range in the Fe-C-Mn system, where most of the available commercial thermodynamic simulation packages have prediction limitation. The phase boundaries predicted using UIPF have been validated with those predicted by ThermoCalc (R), wherever possible/available. Additionally, existing experimental data on growth rates, interlamellar spacing, and partitioning coefficients prevalent during pearlitic transformation in Fe-C-Mn systems have been used to validate the predictions by different LE models adopting UIPF, which in turn affirms the potential of UIPF in predicting thermodynamics and kinetics of phase transformation in Fe-C-Mn systems.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Junhong Fan, Weiqiang Zhang
Summary: A chemically homogeneous structure models were established for different alloy compositions, and calculations were performed to investigate the self-diffusion properties of each component atom. The results showed that the diffusion properties of each component were relatively close in different alloys. The modified results using molecular dynamics were close to the measured values, while the direct substitution of thermodynamic parameters yielded some deviations. The diffusion coefficient of Mn was much higher than other elements in the quaternary alloys, while Cr had a lower diffusion coefficient. In multi-principal alloy systems, there were interactions between components that affected diffusion behavior, with Co, Cr, and Mn tending to promote self-diffusion and Fe and Ni tending to hinder diffusion.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yung-Chien Huang, Yi-Cheng Lai, Yu-Hsien Lin, Shyi-Kaan Wu
Summary: The study demonstrates that the alloying element Ta significantly decelerates grain boundary migration, thereby hindering grain growth and increasing the activation energy value for grain growth Q(G).
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Imed-Eddine Benrabah, Yves Brechet, Gary Purdy, Christopher Hutchinson, Hatem Zurob
Summary: The experimental lengthening kinetics of bainitic ferrite in steels have been consistently found to be slower than those predicted by the diffusional Zener-Hillert model. To reconcile the experimental and calculated kinetics, a 'barrier energy' with a clear physical meaning has been introduced. A modified diffusional growth model, based on the Zener-Hillert model, incorporates a physics-based barrier energy, taking into account interfacial disconnections motion and their interaction with defects in the matrix. The model successfully describes the C-curve growth rate of Widmansta & BULL;tten ferrite and bainitic ferrite in a wide range of steels.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
M. Enomoto
Summary: This study investigated the kinetic transition of partitionless proeutectoid ferrite transformation from austenite in an Fe-C-Mn-Si alloy. By incorporating interfacial segregation of carbon and alloy elements, the time-dependent diffusion equations of solutes were solved to evaluate the transient effects of solute accumulation on the migration of interface. It was found that the migration of interface ceased and stasis occurred when the carbon concentration gradient in the immediate front of the interface turned to null or reversed, leading to earlier transformation than predicted by conventional theory.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Ci Wang, Stephan Schonecker, Wei Li, Yaochun Yang, Qing-Miao Hu, Levente Vitos
Summary: Using density-functional theory, we determined the generalized stacking fault energy for the twinning system in Fe and Fe-Cr alloys, showing that the isosceles twin boundary configuration is energetically preferred. The magnetic ordering effects and Cr content have significant influences on the twin boundary formation and migration energies in different magnetic states.
Article
Chemistry, Physical
Erhu Yan, Wei Liu, Hao Wang, Kexiang Zhang, Xiaoyu Ge, Renjun Huang, Jian Cheng, Yongjin Zou, Hailiang Chu, Huanzhi Zhang, Fen Xu, Lixian Sun
Summary: A new Nb-Hf-Co-Fe alloy hydrogen permeation membrane was synthesized, and the Nb30Hf35Co30Fe5 alloy exhibited the highest hydrogen permeability among the studied alloys. The microstructure and constituent phases of the alloys were systematically studied, and it was found that the increase in Fe content led to changes in the microstructure and the formation of new impurity phases. The increase in hydrogen permeability was mainly attributed to the increase in the hydrogen diffusion coefficient.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Chunyuan Cui, Guangming Cao, Qiming Jiang, Kaifeng Xue, Zhenyu Liu
Summary: In this paper, a generalized additivity model is proposed to better describe anisothermal phase transformation kinetics. Machine learning is used to determine the kinetic parameters and compare them with experimental results. The effect of thermal path on anisothermal kinetics is also discussed.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Alen Fos, Peter Svec Sr, Irena Janotova, Dusan Janickovic, Beata Butvinova, Marek Buran, Anna Kyritsi, Nikolaos Konstantinidis, Patrik Novak
Summary: The crystallization kinetics of rapidly quenched Fe-Sn-B alloys under non-isothermal conditions were studied in this research. Two stages of crystallization were observed in the alloys. The addition of Cu decreased the activation energy of the first stage, while the addition of Co increased it. The crystallization mechanism of Fe81Sn7B12 and (Fe81Sn7B12)99Cu1 alloys involved an increase and subsequent decrease in nucleation rate, whereas the mechanism of (Fe3Co1)81Sn7B12 alloy initially showed an increase in nucleation rate and then a decrease, followed by a decrease to zero. The first stage of crystallization resulted in the formation of alpha-Fe phase with bcc structure from the amorphous matrix, while the second stage led to the crystallization of tetragonal Fe2B phase and hexagonal FeSn phase. The addition of Cu reduced the size of alpha-Fe crystallites by 60% and the concentration of Sn in alpha-Fe phase by 0.8 at. %, while the addition of Co had no effect on the size of alpha-Fe crystallites but decreased the concentration of Sn in alpha-Fe phase by 1.7 at. %.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
I. -E. Benrabah, H. P. Van Landeghem, F. Bonnet, B. Denand, G. Geandier, A. Deschamps
Summary: This study investigates the effect of composition on ferrite growth kinetics in quaternary Fe-C-X1-X2 systems (X: Ni, Cr, Mo) using a high-throughput methodology. The study provides valuable insight for modeling phase transformations and microstructural evolution in multi-component steels. The findings contribute to accelerating alloy optimization and enhancing process control.
Article
Metallurgy & Metallurgical Engineering
Fei Guo, Cheng-Wu Zheng, Pei Wang, Dian-Zhong Li, Yi-Yi Li
Summary: It is found in this study that under low-oxygen conditions, the addition of trace rare earth elements can significantly influence the nucleation, morphology, and growth of ferrite in Fe-0.14%C alloy, by slowing down carbon diffusion and decreasing grain boundary energy. This research provides evidence for adjusting phase transformation and improving the mechanical properties of steels through the addition of rare earth elements.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Chemistry, Physical
Erno Kuzmann, Israel Felner, Laura Sziraki, Sandor Stichleutner, Zoltan Homonnay, Mahmoud R. El-Sharif, Colin U. Chisholm
Summary: Sn-Fe-Ni-Co quaternary alloys with a specific composition range were prepared by electrodeposition methods. The alloys showed amorphous character and exhibited significant ferromagnetism and paramagnetic phases. The alloy coatings also showed magnetic anisotropy in both parallel and perpendicular orientations.
Article
Materials Science, Multidisciplinary
Zohra Bahnes, Mohammed El Amine Monir, Ibtisam. F. Al-Maaitah, Amel Laref, Abdelkarim Bendoukha Reguig, Hadj Baltach, Djazia Nasri
Summary: In this study, the structural, electronic, and magnetic properties of new quaternary Heusler alloys CoX'YP were investigated using the density functional theory (DFT) and full-potential linearised augmented plane waves with local orbitals (FP-LAPW + lo) method. The results show that these alloys have structural stability in the Y-type structure and magnetic stability in the ferromagnetic phase. They exhibit complete half-metallic character in terms of electronic properties, and their magnetic properties obey the Slater-Pauling rule.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Materials Science, Multidisciplinary
Qisheng Feng, Baohua Duan, Lu Mao, Lina Jiao, Guangyao Chen, Xionggang Lu, Chonghe Li
Summary: This study summarizes and reviews the experimental investigation and thermodynamic description of the Ti-Al-Fe-V quaternary system, and re-assesses the Ti-Fe-V system using the CALPHAD approach. It also proposes a method of titanium alloy design combining Mo equivalent with CALPHAD.
Review
Metallurgy & Metallurgical Engineering
H. K. D. H. Bhadeshia, D. -W. Suh
IRONMAKING & STEELMAKING
(2015)
Article
Nanoscience & Nanotechnology
Joonoh Moon, Tae-Ho Lee, Yoon-Uk Heo, Young-Soo Han, Jun-Yun Kang, Heon-Young Ha, Dong-Woo Suh
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2015)
Article
Materials Science, Multidisciplinary
Y. H. Choi, K. -S. Park, T. -K. Jeong, J. S. Lee, D. -W. Suh
MATERIALS SCIENCE AND TECHNOLOGY
(2017)
Article
Materials Science, Multidisciplinary
Kyooyoung Lee, Joo Hyun Ryu, Sea Woong Lee, Won Hwi Lee, Jeong In Kim, Dong-Woo Suh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Lawrence Cho, Eun Jung Seo, Geun Su Jung, Dong Woo Suh, Bruno C. De Cooman
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Jeong In Kim, Joo Hyun Ryu, Sea Woong Lee, Kyooyoung Lee, Yoon-Uk Heo, Dong-Woo Suh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Seong Hoon Kim, Dae Ha Kim, Keum-Cheol Hwang, Sang-Bok Lee, Sang-Kwan Lee, Hyun Uk Hong, Dong-Woo Suh
METALS AND MATERIALS INTERNATIONAL
(2016)
Article
Materials Science, Multidisciplinary
Geunsu Jung, In Soo Woo, Dong Woo Suh, Sung-Joon Kim
METALS AND MATERIALS INTERNATIONAL
(2016)
Article
Chemistry, Physical
Chan Hee Park, Jong-Taek Yeom, Dong-Woo Suh, Shuichi Miyazaki
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Materials Science, Multidisciplinary
Do Kyeong Han, A. In Hwang, Woo Jun Byeon, Seung Jeong Noh, Dong-Woo Suh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2017)
Article
Materials Science, Multidisciplinary
Jeong In Kim, Yong Hoon Choi, Joo Hyun Ryu, Sea Woong Lee, Kyooyoung Lee, Dong-Woo Suh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2017)
Article
Nanoscience & Nanotechnology
Joonoh Moon, Seong-Jun Park, Jae Hoon Jang, Tae-Ho Lee, Chang-Hoon Lee, Hyun-Uk Hong, Dong-Woo Suh, Seong Hoon Kim, Heung Nam Han, Bong Ho Lee
SCRIPTA MATERIALIA
(2017)
Article
Nanoscience & Nanotechnology
Dong-Woo Suh, Sung-Joon Kim
SCRIPTA MATERIALIA
(2017)
Article
Metallurgy & Metallurgical Engineering
Seokhwan Ju, Ho Hyeong Lee, Jong-Ho Shin, Dong-Woo Suh
Summary: This study investigates the effect of partial replacement of Co with Cu on isothermal transformation kinetics in 10Cr-based heat-resistant steels. The results show that the partial replacement of Co with Cu slows down the isothermal transformation kinetics and lowers the nose temperature of transformation.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Thermodynamics
Jae Sang Lee, Dong-Woo Suh, Yang Mo Koo, Seong Gyoon Kim
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2017)
