Article
Metallurgy & Metallurgical Engineering
Heechan Jung, Gunjick Lee, Minseo Koo, Hyejin Song, Won-Seok Ko, Seok Su Sohn
Summary: This study investigates the brittle fracture behavior of Fe-0.3C-9Mn-5Al steel during annealing at different temperatures, and reveals the role of Mn segregation at the phase boundaries between ferrite and austenite.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Donggyun You, Jin-Kyung Kim
Summary: This study investigates the microstructures and mechanical properties of precipitation-hardened medium Mn steel processed via room temperature quenching and partitioning. The results show that samples subjected to partitioning below 400 degrees C have a microstructure consisting of lath martensite and retained austenite, while the sample partitioned at 500 degrees C exhibits a high fraction of retained austenite. Carbon partitioning during the process leads to higher carbon contents. The sample partitioned at 200 degrees C demonstrates an excellent combination of strength and ductility, while samples partitioned above 400 degrees C show poor ductility with brittle fracture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Achintya Kumar Patra, C. N. Athreya, Sumantra Mandal, K. C. Hari Kumar, Subramanya Sarma
Summary: This study focused on the development of medium Mn steels, aiming to achieve a high tensile strength-high ductility combination through computational design and thermomechanical processing. By optimizing the alloy chemistry and microstructure, the designed steel successfully demonstrated high ductility and strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Colin A. Stewart, Richard W. Fonda, Keith E. Knipling
Summary: An ICME approach was utilized to design a fully Austenitic, Mn-stabilized steel strengthened by nano-scale precipitate phases. Experimental verification confirmed that significant strengthening can be achieved by adding Cu together with Ni+Al, forming FCC-Cu and beta-NiAl nano-precipitates.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Baojia Hu, Qinyuan Zheng, Yi Lu, Chunni Jia, Tian Liang, Chengwu Zheng, Dianzhong Li
Summary: A novel processing route of intercritical Mn partitioning is proposed to stabilize the reverted austenite in a medium Mn steel, which consists of a core in low Mn content and a shell in relatively high Mn content. This distinctive microstructure allows for more retained austenite and excellent mechanical properties.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Zigan Xu, Xiao Shen, Tarek Allam, Wenwen Song, Wolfgang Bleck
Summary: This study developed a compact two-step heat treatment to improve the ductility and strength of low carbon medium manganese steels (MMnS) through the synergistic effect of austenite reversion and nano-precipitation. The annealing step promoted the formation of reverted austenite, while the subsequent tempering step resulted in the formation of nano-precipitates enriched with Cu, Ni, Al, and Mn.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Qingdong Liu, Hui Song, Jing Zhang, Jiaxin Ding, Yihua Chen, Jianfeng Gu
Summary: The novel ultralow carbon precipitation-hardening Ni-Mn-Cu-Al-Co ferritic steel was designed to investigate the co-precipitation behaviors of Cu-rich and beta-NiAl precipitates. Nanoscale clusters and precipitates formed at 450 and 500 degrees C tempering are responsible for the strong precipitation strengthening effect. The strength contributions from dislocated martensite, solid solution, and precipitation were compared with experimental values, with precipitation hardening found to be dominant.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Maribel Arribas, Eider Del Molino, Teresa Gutierrez, Artem Arlazarov, David Martin, Daniele De Caro, Sudhindra Ayenampudi, Maria J. Santofimia
Summary: In this study, a medium Mn-Ni steel was treated through Quenching and Partitioning (Q&P) with different quenching temperatures (QT) and partitioning times (Pt) to investigate their influence on the stabilization of austenite and mechanical properties. It was found that the quenching temperature had a significant influence on the results. The Q&P cycle with quenching to room temperature and a high partitioning temperature produced a steel with a high retained austenite (RA) volume fraction and exceptional strength-ductility balance.
Article
Materials Science, Multidisciplinary
Sachin Kumar, Shiv Brat Singh
Summary: A low-carbon low-alloy steel with multiphase microstructures was studied after two-step quenching and partitioning (Q&P) treatments. The tensile properties of Q&P samples were investigated, with a focus on the influence of bainitic-ferrite. The yield strength of the Q&P steel was calculated by considering various strengthening mechanisms, and the contribution of different microstructural components was analyzed.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Lei Liu, Cainian Jing, Borong Shan, Zhihao Zhang, Shunzhi Zhao, Tao Lin, Jingrui Zhao
Summary: The effects of different annealing temperatures on the microstructure, C-element diffusion, and mechanical properties of medium-Mn steel using the one-step quenching and partitioning (Q&P) process combined with the annealing process were systematically studied. The results showed that the annealed test steel at 670 degrees Celsius exhibited excellent comprehensive mechanical properties.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Cansheng Yu, Hesong Wang, Yuanxiang Zhang, Yunjie Li, Jian Kang, Zhiyuan Chang
Summary: Twin-roll strip casting combined with hot rolling and quenching and partitioning process can be used for the production of medium-Mn steel, and good microstructure and mechanical properties can be obtained by controlling the quenching temperature.
Article
Nanoscience & Nanotechnology
Eun Tae Kim, Muhammad Ishtiaq, Jong Chan Han, Kwang Kyu Ko, Hyo Ju Bae, Hyokyung Sung, Jung Gi Kim, Jae Bok Seol
Summary: This study compared the passive films on typical stainless steels and a newly developed high-Cr-high-Mn steel, finding that MnO in the high-Mn steel was prone to corrosion cracking while this was not observed in stainless steels. Adding Mo and Ni can reduce harmful MnO, facilitating the development of high-Mn base stainless steel materials. Higher MoO2 composition in the passive films on austenitic stainless steels may lead to improved pitting resistance, particularly in 316 series compared to 304 series.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
C. Hu, C. P. Huang, Y. X. Liu, A. Perlade, K. Y. Zhu, M. X. Huang
Summary: In this study, the tensile and fracture behaviors of a medium Mn steel fabricated by intercritical annealing (IA) and room-temperature quenching and partitioning (RT Q&P) processes were investigated. The IA steel consists of ultrafine-grained ferrite and austenite, while the RT Q&P steel is comprised of martensite matrix and retained austenite. The strain localization is moderate in the RT Q&P steel but highly localized in the IA steel, leading to premature decohesion and sudden fracture.
Article
Materials Science, Multidisciplinary
Nianshuang Qiu, Zhuang Shen, Xiaowei Zuo, Gang Zhou
Summary: In this study, the influence of Mo addition on multiple precipitates in high-strength ferritic steel was investigated using atom probe tomography and first-principles calculations. It was confirmed that a co-precipitate in the steel was nucleated from the abundance of Cu atoms. The addition of Mo accelerated the nucleation process of Cu-rich precipitates and structural transformation of co-precipitates, and significantly increased the nucleation rate of a NiAl-based precipitate.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
A. Kwiatkowski da Silva, I. R. Souza Filho, W. Lu, K. D. Zilnyk, M. F. Hupalo, L. M. Alves, D. Ponge, B. Gault, D. Raabe
Summary: The authors propose a segregation-based strategy to produce a sustainable steel that achieves ultrahigh-strength without the use of critical elements. Their experimental results show that this steel outperforms most common commercial alloys.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Lawrence Cho, Dimas H. Sulistiyo, Eun Jung Seo, Kyoung Rae Jo, Seong Woo Kim, Jin Keun Oh, Yeol Rae Cho, Bruno C. De Cooman
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2018)
Article
Nanoscience & Nanotechnology
Eun Jung Seo, Lawrence Cho, Jin Kyung Kim, Javad Mola, Lijia Zhao, Bruno C. De Cooman
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Materials Science, Multidisciplinary
Lindsay Golem, Lawrence Cho, John G. Speer, Kip O. Findley
MATERIALS & DESIGN
(2019)
Article
Materials Science, Coatings & Films
Kyoung Rae Jo, Lawrence Cho, Dimas H. Sulistiyo, Eun Jung Seo, Seong Woo Kim, Bruno C. De Cooman
SURFACE & COATINGS TECHNOLOGY
(2019)
Article
Chemistry, Physical
Eun Jung Seo, Lawrence Cho, Jin Kyung Kim, Javad Mola, Lijia Zhao, Sukjin Lee, Bruno C. De Cooman
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
Diptak Bhattacharya, Lawrence Cho, Ellen van der Aa, Hassan Ghassemi-Armaki, Andreas Pichler, Kip O. Findley, John G. Speer
SCRIPTA MATERIALIA
(2020)
Article
Nanoscience & Nanotechnology
D. Bhattacharya, L. Cho, E. van der Aa, A. Pichler, N. Pottore, H. Ghassemi-Armaki, K. O. Findley, J. G. Speer
Summary: The study shows that variations in the starting microstructure can influence the susceptibility of a material to zinc-assisted liquid metal embrittlement (LME). Modifying the starting microstructure through heat treatment can affect the material's resistance to LME, for example, dual-phase steel exhibits lower LME susceptibility compared to other martensitic and bainitic-ferrite based microstructures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Lawrence Cho, Lindsay Golem, Eun Jung Seo, Diptak Bhattacharya, John G. Speer, Kip O. Findley
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
L. Cho, P. E. Bradley, D. S. Lauria, M. L. Martin, M. J. Connolly, J. T. Benzing, E. J. Seo, K. O. Findley, J. G. Speer, A. J. Slifka
Summary: This study provides a detailed characterization of the microstructures and dislocation characteristics beneath hydrogen-induced quasi-cleavage fracture features of an as-quenched martensitic steel. The dominant fracture mode in the hydrogen-affected zones was found to be quasi-cleavage fracture, involving significant plasticity. The sizes, orientations, and boundaries of the martensite constituents influenced the surface morphologies of the quasi-cleavage fractures.
Review
Materials Science, Multidisciplinary
Lawrence Cho, Yuran Kong, John G. Speer, Kip O. Findley
Summary: Recent research has focused on developing advanced/ultrahigh-strength medium-Mn steels, leading to the introduction of new alloying concepts, processing routes, and microstructural variants. Despite this progress, certain grades of A/UHSS are still highly susceptible to hydrogen embrittlement due to their high strength levels. This paper aims to review the current understanding of hydrogen embrittlement in medium or intermediate Mn multiphase steels and discuss various alloying and processing strategies to enhance their resistance to hydrogen.
Article
Chemistry, Physical
L. Cho, P. E. Bradley, D. S. Lauria, M. J. Connolly, E. J. Seo, K. O. Findley, J. G. Speer, L. Golem, A. J. Slifka
Summary: Testing in gaseous hydrogen resulted in significant reductions in tensile strength and ductility for press-hardened martensitic steel (PHS). The susceptibility to hydrogen-induced fracture was greater with larger prior austenite grain size (PAGS), while refining the martensitic microstructure improved toughness, especially at lower hydrogen pressures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
D. Bhattacharya, L. Cho, D. Marshall, M. Walker, E. van der Aa, A. Pichler, H. Ghassemi-Armaki, K. O. Findley, J. G. Speer
Summary: The study investigated the susceptibility of two different chemical compositions of advanced high strength steels to Zn-assisted liquid metal embrittlement (LME), finding that the silicon content plays a significant role in determining LME sensitivity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Javad Mola, Eun Jung Seo, Lawrence Cho
Summary: The hardness of austenite in Fe-1.5%Mn-(0.44-1.46)%C steels was estimated through an extrapolation procedure, showing non-linear variations with carbon concentration and maximum hardness at intermediate carbon concentrations. This behavior was explained by the influence of carbon on the mechanical stability of austenite and hardness of martensite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lawrence Cho, Anastasiya Tselikova, Kelsey Holtgrewe, Emmanuel De Moor, Rolf Schmidt, Kip O. Findley
Summary: This paper discusses the importance of toughness and fatigue resistance in welds and HAZs of high-strength steels for structural applications. It explores the transformation characteristics of acicular ferrite in relation to alloying and weld processing, and highlights the specific role of acicular ferrite in weld performance. The paper also identifies the need for future research to identify suitable weld processes for specific alloying strategies.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
D. Bhattacharya, L. Cho, J. Colburn, D. Smith, D. Marshall, E. van der Aa, A. Pichler, H. Ghassemi-Armaki, N. Pottore, K. O. Findley, J. G. Speer
Summary: This work investigates the influence of selected alloying variations on Zn-assisted liquid metal embrittlement (LME) susceptibility of Zn-coated advanced high strength steels (AHSS). The study reveals that the Si content of AHSS is strongly correlated with Zn-LME susceptibility, and Si suppresses the formation of Fe-Zn intermetallic phases at the coating-substrate interface.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.
