Article
Metallurgy & Metallurgical Engineering
Michael Hauser, Olena Volkova, Marco Wendler
Summary: The mechanical properties of two metastable austenitic cast steels were examined through tensile tests in a temperature range of -70 to 300°C. The M-s and M-d temperatures for the 16-6-6 steel were -30°C and 100°C, respectively. The possibility of athermal martensite formation below -196°C was excluded for the X3CrNiCuN17-6-4 steel. The M-d temperature for X3CrNiCuN17-6-4 steel was found to be 130°C. The results obtained from a semiempirical thermodynamic-mechanical calculation model were compared to experimental results from tensile tests.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Physical
Steffen Scherbring, Guanghui Chen, Bastian Veltel, Gert Bartzsch, Julia Richter, Malte Vollmer, Malte Blankenburg, Saikat Shyamal, Olena Volkova, Thomas Niendorf, Ulrich Lienert, Puspendu Sahu, Javad Mola
Summary: Adding aluminum to stainless steel can improve its performance, particularly in terms of increasing yield strength, as observed in this study on the influence of aluminum addition on microstructure and mechanical properties.
Article
Nanoscience & Nanotechnology
Hyung-Jun Cho, Yeonggeun Cho, Gang Hee Gu, Hyoung Seop Kim, Sunghak Lee, Sung-Joon Kim
Summary: The effects of Cu as an element on the deformation mechanisms and tensile ductility of austenitic stainless steels (ASSs) were investigated by varying the tensile strain rate. The study found that Cu and strain rate have different effects on the elongation, and there is a competition between two mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Hongquan Song, Qianjin Ma, Wei Zhang, Fuyang Tian
Summary: In this study, the phonon density of states and thermodynamic properties of Co-Cr-Fe-Mn-Ni high-entropy alloys with vacancies were investigated using the first-principles method. It was found that the atomic radius, dependent on the local chemical environment, is related to phonon information and vibrational entropy. Vacancies were observed to increase vibrational entropy and heat capacity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Hamidreza Kamali, Haibo Xie, Fanghui Jia, Hongyun Bi, E. Chang, Haigang Xu, Haifeng Yu, Zhengyi Jiang
Summary: The microstructure and texture evolution of a low-Ni Cr-Mn-N austenitic stainless steel during a three-point bending process were analyzed, revealing differences in deformation-induced martensite fraction and texture between different regions.ε-Martensite and α'-martensite were observed in varying proportions between the two regions, leading to changes in texture and twin boundaries.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Juan Bosch, Ulises Martin, Willian Aperador, Jose M. Bastidas, Jacob Ress, David M. Bastidas
Summary: The study investigated the corrosion behavior of austenitic Fe-Mn-Al-Cr-C TWIP and MBIP steels with different alloying elements, and found pitting as the dominant corrosion mechanism in high-Mn TWIP steels. X-ray diffraction analysis revealed corrosion products and a protective Al2O3 passive film was observed. The MBIP steel exhibited the highest corrosion susceptibility in both chloride and alkaline solutions.
Article
Materials Science, Multidisciplinary
Hyeon-Seok Do, Won-Mi Choi, Byeong-Joo Lee
Summary: Research on representative Co-Cr-Fe-Mn-Ni high-entropy alloys has been conducted to develop new HEAs with improved strength, utilizing computational thermodynamic prediction to efficiently design the new HEAs. The phase equilibria in HEAs can be effectively predicted by CALPHAD type techniques, but challenges still exist due to incompleteness in thermodynamic descriptions for constituent ternary systems. Developing a self-consistent thermodynamic description for the quinary system involved completing descriptions for constituent ternary sub-systems and carrying out new assessments, with the reliability confirmed by comparing calculated vertical sections of the quinary phase diagram with experimental information.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
Hanchi Zhang, Yingchun Wang, Xuyangfan Qiu, Chong Gao, Zhiping Xiong, Xingwang Cheng
Summary: The microstructures and mechanical properties of Fe-24Mn-10Al-6Ni-1C steels microalloyed by Nb, Mo, and Nb-Mo coaddition in both solid solution and aging states are evaluated. The addition of Nb, Mo, or Nb-Mo leads to a decrease in austenitic grain size and suppression in κ-carbides precipitation during aging. The strengths and ductility of the steels are improved after adding microalloying elements, with the coaddition of Nb-Mo achieving the best combination of strength and ductility. However, the precipitation of κ-carbides and B2 particles during aging reduces the plasticity of the steels.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Dmitry Chebykin, Tobias Dubberstein, Hans-Peter Heller, Olga Fabrichnaya, Olena Volkova
Summary: The present study investigated the wetting behavior of Cr-Mn-Ni-alloys with TRIP/TWIP-effects on the hBN-SiCZrO2-substrate using the sessile drop method. The results show that the increase in nickel content increases the contact angle, while the increase in sulfur content decreases the contact angle. Additionally, the increase in contact angle is related to the evaporation of manganese.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Christian Wagner, Alberto Ferrari, Jurgen Schreuer, Jean-Philippe Couzinie, Yuji Ikeda, Fritz Koermann, Gunther Eggeler, Easo P. George, Guillaume Laplanche
Summary: The physical properties of ten single-phase FCC CrxMn20Fe20Co20Ni40-x high-entropy alloys were investigated. The lattice parameters of the alloys were nearly independent of composition, while the solidus temperatures increased linearly with increasing Cr content. The alloys did not exhibit ferromagnetism in a certain temperature range, and the temperature dependencies of their coefficients of thermal expansion and elastic moduli were independent of composition. Ab initio simulations qualitatively reproduced the magnetic transitions and magnetostriction observed in the alloys. The plastic deformation of the alloys was found to occur initially by the glide of perfect dislocations on {111} planes. The stacking fault energy (SFE) was determined and found to decrease with increasing Cr content. However, the calculated intrinsic SFEs were lower than the experimental values. The ab initio simulations showed that atomic relaxations, finite temperatures, and magnetism strongly influenced the intrinsic SFE.
Article
Nanoscience & Nanotechnology
Hyungkwon Park, Changuk Lee, Kyeong-Won Kim, Sung-Dae Kim, Jae Hoon Jang, Heon-Young Ha, Joonoh Moon, Chang-Hoon Lee, Seong-Jun Park
Summary: This study investigates the machinability of austenitic LWS and the impact of MnS formation on its mechanical and machinability properties. The research finds that the number and area fraction of MnS inclusions increase linearly with the increase of S content, while the size of inclusions first increases rapidly and then slows down. The tensile properties remain unchanged regardless of the S content, but the impact energy deteriorates linearly with the increase of S content. Additionally, the formation of MnS inclusions significantly improves the machinability of LWS by acting as sites of mechanical stress concentration and generating thermal cavity and pores during machining.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
I. Reda Ibrahim, Mahmoud Khedr, Tamer S. Mahmoud, Hamed A. Abdel-Aleem, Atef Hamada
Summary: In this study, dissimilar butt joints between a low-Ni, medium-Mn austenitic stainless steel and a Ni-Cr austenitic stainless steel were processed by gas tungsten arc welding technique with ER308 filler metal. Microstructural analysis revealed a duplex structure in the fusion zone of joints processed under low and high heat inputs. Joints with high heat input showed lower hardness values and tensile strength, attributed to inhomogeneous dendritic structure and Cr-carbide precipitation in the fusion zone.
Article
Chemistry, Physical
Valery Shabashov, Kirill Lyashkov, Kirill Kozlov, Vladimir Zavalishin, Andrey Zamatovskii, Natalya Kataeva, Victor Sagaradze, Yurii Ustyugov
Summary: The study determined a narrow temperature range of changes in the mechanism and kinetics of structural-phase transformations during mechanical alloying in high-nitrogen chromium-manganese steel, leading to abnormal behavior of the mechanical properties of the steel. The direction of nitrogen redistribution was found to change due to the acceleration of the decomposition of nitrogen-supersaturated solid solution of austenite with the formation of secondary nanocrystalline nitrides.
Article
Materials Science, Multidisciplinary
Lele Liu, Hao Zhang, Hongyun Bi, E. Chang, Moucheng Li
Summary: The microstructure and corrosion behavior of metastable austenitic stainless steel in acidic solution were investigated. Cold rolling deformation increased the martensite content and accelerated the active corrosion rate, while decreasing the pitting potential.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
R. Silva, D. J. Young, C. B. Martins Junior, G. S. Vacchi, C. A. Teixeira Alberto, A. M. de Sousa Malafaia, C. Pascal, C. A. D. Rovere
Summary: Austenitic Fe-13.50Mn-3.98Si-9.54Cr-4.51Ni shape memory alloy alloyed with (0.18, 0.42 and 0.96 wt%) Ce exhibited improved oxidation resistance at 800℃ in air. The addition of 0.18 and 0.42 wt% Cerium resulted in protective kinetics, while 0.96 wt% Ce did not affect the oxidation resistance. The enhanced oxidation resistance was attributed to the growth of a fine-grained oxide layer with higher Cr content, while Cerium acted as a scavenger to suppress S interfacial segregation.
Article
Materials Science, Multidisciplinary
Kyung-Shik Kim, Jee-Hyun Kang, Sung-Joon Kim
Summary: The study revealed that carbon can alleviate the impact of hydrogen on the tensile properties of stainless steel, but increasing the carbon content does not significantly affect hydrogen diffusivity. Cracks induced by hydrogen mainly occur at grain boundaries and propagate inside grains, but are suppressed by grain boundaries.
Article
Engineering, Mechanical
J. Park, K. Lee, J. -H. Kang, J. -Y. Kang, S. H. Hong, S. W. Kwon, M. -G. Lee
Summary: A microstructure-based integrated crystal plasticity and continuum damage mechanics model is proposed for simulating rolling contact fatigue, with a focus on damage formation mechanisms and predictive methods. Numerical sensitivity analysis is conducted to demonstrate how to optimize the RCF process for improving the performance of materials and parts.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
Dong Hwi Kim, Jee-Hyun Kang, Hojun Gwon, Joo Hyun Ryu, Sung-Joon Kim
Summary: The addition of silicon in quenching and partitioning (Q&P) steels can effectively suppress carbide formation, promote carbon partitioning to austenite, and enhance solid solution strengthening effect. Furthermore, silicon improves the stability of austenite, leading to a gradual transformation into martensite during deformation, resulting in increased yield and tensile strengths of the steel.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jee-Hyun Kang, Jungwoong Kim, Jun-Yun Kang, Soon-Woo Kwon, Min-Woo Kang, Seung Hyun Hong
Summary: This study provides an in-depth characterization of the formation mechanism of the dark-etching region (DER) caused by rolling contact fatigue in bearing steel. The results reveal that the accumulation of plastic flow and dynamic recrystallization contribute to the hardness reduction and etching behavior, which may lead to spalling of the bearing.
Article
Nanoscience & Nanotechnology
Dimas Reza Lazuardi, Sung-Joon Kim, Haekyoung Kim, Jee-Hyun Kang
Summary: The bake-hardening behavior of a medium Mn steel was investigated after intercritical annealing. The steel annealed at 760°C exhibited a higher bake-hardening response compared to the steel annealed at 680°C. This difference was attributed to the presence of martensite in the 760°C annealed steel, which generated dislocations during quenching and prestraining. Baking further increased the strength by pinning more dislocations and precipitating fine carbides, while also stabilizing the austenite phase and enhancing the ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Jae-Myeong Kim, Sung-Joon Kim, Jee-Hyun Kang
Summary: The tensile behavior of austenitic stainless steels with different nitrogen concentrations was studied. Increasing nitrogen concentration increased stacking fault energy (SFE) and short-range ordering (SRO), affecting the tensile behavior. Nitrogen addition induced slip planarity and delayed dynamic recovery, leading to an increase in work hardening rate (WHR) at the end of the intermediate deformation stage. At higher strain levels, nitrogen addition suppressed slip line formation and promoted dynamic recovery, accelerating the reduction in WHR. The overall dynamic recovery behavior depended mainly on SRO rather than SFE.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jee-Hyun Kang, Young-Gun Ko
Summary: This study compares steel sheets containing 0.18 wt % C deformed by differential speed rolling (DSR) and equal speed rolling (ESR), and finds that DSR is more effective in achieving grain refinement and microstructure homogeneity, resulting in significant increase in hardness and strength through grain boundary strengthening.
Article
Materials Science, Multidisciplinary
Doyub Kim, Seok-Hyun Hong, Jee-Hyun Kang, Young-Roc Im, Sung-Joon Kim
Summary: This study investigated the microstructural evolution of TRIP steel sheets prepared by different coating processes and their sensitivity to liquid metal embrittlement (LME). The results showed that the coating process influenced the Fe-Zn reaction, which controlled the contact between the steel substrate and liquid Zn alloy at high temperatures. The electro-galvanized TRIP steel exhibited the highest resistance to LME, while the continuously galvanized steel was the most susceptible.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Seok-Jun Park, Kyung-Shik Kim, Jee-Hyun Kang, Sung-Joon Kim
Summary: In this study, the Hall-Petch relationship was investigated for austenitic stainless steels with either 0.3 wt% C or N. It was found that the nitrogen-containing steel exhibited a higher Hall-Petch slope, indicating that a higher stress was required to activate the dislocation source in adjacent grains. The researchers suggested that the presence of nitrogen in the steel hindered cross-slip at the grain boundaries and delayed the activation of the dislocation source.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Jee-Hyun Kang, Young Gun Ko
Summary: This study investigated the microstructural evolution and mechanical properties of an ultrafine-grained aluminum alloy processed by multi-pass differential speed rolling. The deformed microstructure gradually evolved from band-like structure to equiaxed ultrafine grains with high angle grain boundaries. Tensile test results showed increased strength with decreasing grain size but sacrificed ductility, while the contribution of strengthening mechanisms was discussed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Oncology
Jee Hyun Kang, Suyoung Park, Jinhyung Rho, Eun-Ju Hong, Young-Eun Cho, Young-Suk Won, Hyo-Jung Kwon
Summary: IL-17A promotes gastric carcinogenesis, potentially through the regulation of the IL-17RC/NF-κB/NOX1 pathway. This finding provides a new target for the treatment of gastric cancer.
Article
Chemistry, Multidisciplinary
Jee Hyun Kang, Yu-Jin Kim, Eun Bok Baek, Eun-Ju Hong, Mee-Young Lee, Hyo-Jung Kwun
Summary: Jakyakgamcho-tang (JGT) has been found to prevent airway inflammation and remodeling caused by chronic obstructive pulmonary disease (COPD) in a mouse model. It reduces inflammatory cell count, expression levels of inflammatory factors, and inhibits the increase of related proteins.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Jee Hyun Kang, Eunhye Jung, Eun-Ju Hong, Eun Bok Baek, Mee-Young Lee, Hyo-Jung Kwun
Summary: This study evaluated the therapeutic effect of Cheonwangbosim-dan (CBD) on chronic obstructive pulmonary disease (COPD). The results showed that CBD can alleviate inflammation and airway remodeling caused by cigarette smoke and lipopolysaccharide, suggesting its potential preventive and therapeutic applications in COPD patients.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
I. Putu Widiantara, Rosy Amalia Kurnia Putri, Da In Han, Warda Bahanan, Eun Hye Lee, Chang Hoon Woo, Jee-Hyun Kang, Jungho Ryu, Young Gun Ko
Summary: Metal injection molding (MIM) is a fast and accurate method for producing elaborate and complex items. This study focused on the characterization of the green part of steel produced using MIM. Parameters such as dual gates position, injection temperature, and injection pressure were analyzed. Results showed that the green part had a good filling confidence, minimal defects, and decent homogeneity, providing valuable guidelines for high-quality MIM of steel.
Article
Chemistry, Applied
Wail Al Zoubi, Bassem Assfour, Abdul Wahab Allaf, Stefano Leoni, Jee-Hyun Kang, Young Gun Ko
Summary: A novel one-pot interfacial plasma-discharge-driven (IP-D) synthesis strategy is developed to fabricate stable high-entropy-alloy (HEA) nanoparticles with ultrasmall size on a porous support surface. Multiple metallic elements are successfully incorporated into the HEA nanoparticles using an electric field, and the nanoparticles are attached to a porous magnesium oxide surface via rapid cooling. The CuAgNiFe catalyst shows excellent catalytic performance and consistent activity, outperforming conventional photocatalysts.
JOURNAL OF ENERGY CHEMISTRY
(2023)
