Article
Materials Science, Multidisciplinary
M. Nagaraj, D. Ravi Kumar, K. S. Suresh, Suresh Neelakantan
Summary: The tribocorrosion behavior of 316L austenitic stainless steel after equal channel angular pressing (ECAP) was investigated. ECAP resulted in significant grain refinement and improved hardness and strength of the material. The refined grains showed high resistance to plastic deformation, leading to minimal wear volume loss and low coefficient of friction during tribocorrosion. The surface morphology confirmed the prevalence of abrasive wear in all samples.
Article
Automation & Control Systems
Jairo Alberto Munoz, Mohan Chand, Javier Walter Signorelli, Jessica Calvo, Jose Maria Cabrera
Summary: This study investigates the microstructural evolution, plastic anisotropy, and mechanical behavior of a duplex stainless steel processed by the ECAP technique. The results show that the ECAP processing led to the formation of ultrafine grains with grain sizes smaller than 300 nm in both austenite and ferrite phases. The different strain hardening rates of austenite and ferrite result in plastic instabilities at different strain magnitudes, with austenite providing more hardening while ferrite contributes to ductility. Additionally, crystal plasticity simulations reveal that austenite is more responsible for larger planar anisotropy values compared to ferrite after multiple ECAP passes.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mario Scholze, Martin F. -X. Wagner, Dagmar Dietrich, Cagatay Elibol, Sebastian Fritsch, Christian Illgen, Benjamin Bohne, Marcus Boehme, Damien Colas, Philipp Frint
Summary: The ability to modify microstructural features and properties make red gold an attractive choice for applications in electronics, dental devices, and jewelry. This study investigates the effect of severe plastic deformation by equal-channel angular pressing (ECAP) on microstructural evolution in an 18-carat AuCuAg alloy and the ordering kinetics during subsequent aging. The results demonstrate the potential of ECAP combined with heat treatments for microstructural optimization of AuCuAg alloys and their applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Beom Joon Kim, Marina Abramova, Hyoung Seop Kim, Nariman Enikeev, Jung Gi Kim
Summary: In this study, the mechanical properties of high-Mn steel subjected to equal-channel angular pressing (ECAP) were investigated at cryogenic temperatures. The results showed that ECAP led to grain refinement and the formation of nanotwins, resulting in a heterogeneous hierarchical structure. This microstructure greatly enhanced the strength of the steel in a cryogenic environment. The effects of heterogeneity induced by heavy straining of the initially coarse-grained material were also discussed.
Article
Nanoscience & Nanotechnology
Rae Eon Kim, Jongun Moon, Eun Seong Kim, Jungwan Lee, Hyoung Seop Kim
Summary: This study focuses on a new strategy for designing heterostructured laser-clad materials with dynamically reinforceable heterogeneity introduced through texture-engineering, achieving superior mechanical properties.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Cheng-Han Yu, Alexander Leicht, Ru Lin Peng, Johan Moverare
Summary: The study investigates the fatigue properties and dimensional limitations of as-built components by laser powder bed fusion. It explores the thin-wall effect, surface roughness impact on fatigue life, and differences in characteristics under various processing conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chunlei Zhang, Dorte Juul Jensen, Tianbo Yu
Summary: We analyze the effects of the initial 3D printed microstructure of 316 L stainless steel on subsequent deformation behavior. Deformation twinning occurs at lower strains in 3D printed samples, and twins are thinner and intersecting inside some grains. Pre-existing dislocation structure in the 3D printed samples facilitates deformation twinning. The study provides fundamental ideas for microstructural engineering of 3D printed metals for better mechanical properties.
Article
Materials Science, Multidisciplinary
Hongfei Wang, Chunyan Ban, Nannan Zhao, Lei Li, Qingfeng Zhu, Jianzhong Cui
Summary: In this study, pure titanium samples with a purity of 99.99 wt.% were successfully processed by ECAP at cryogenic temperature, leading to significant grain refinement and increased hardness. The activation of slip systems during deformation process was observed, and the influence of temperature on grain refinement was discussed. Factors affecting the homogeneity of microstructure were also analyzed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Weiyang Wang, Shuang Zhou, Zhu Xiao, Wenting Qiu, Qian Lei
Summary: This study investigated the microstructure evolution and properties of a CuCrZrSc alloy undergoing aging treatment and equal channel angular pressing (ECAP). The results showed that pre-aging treatment significantly improved the mechanical properties and electrical conductivity of the alloy. After 12 passes of deformation and aging treatment, the alloy exhibited enhanced mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Samed Enser, Mustafa Guden, Alper Tasdemirci, Kemal Davut
Summary: The strain rate history effect in a selective laser melt 316L alloy was investigated through quasi-static and high strain rate interrupted and reloading compression tests. The flow stress depended on strain, strain rate, and strain-rate history. Reloading the specimens induced different effects on flow stress depending on the loading condition.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Yong Li, Yi Xiong, Tian Zhou, Harishchandra Singh, Jukka Koemi, Marko Huttula
Summary: Equal-channel angular pressing (ECAP) of granular pearlite high-carbon steel at 650 degrees C via the Bc route was thoroughly investigated in this study. The microstructure evolved to an ultra-microduplex structure, with changes in microhardness, tensile strength, yield strength, and yield ratio. Fracture morphology shifted from deep dimples to small dimples, indicating a typical ductile fracture of the pearlitic steel after ECAP application.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Dengcui Yang, Yan Zhao, Xinfeng Kan, Xiaohong Chu, Hang Sun, Zhengzhi Zhao, Jiquan Sun, Haibing Wang
Summary: In this study, the microstructures, mechanical properties, and deformation behaviors of 316L stainless steel fabricated by selective laser melting (SLM) were investigated. It was found that SLM resulted in a high dislocation density, contributing to the enhancement of yield strength. Twinning occurred during the early stage of SLM deformation and underwent obvious grain rotation and twinning development during tensile tests. However, only a few transformed martensite was observed in the deformed samples, with no significant changes in grain orientation.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Hongyu Yu, Rong Chen, Wenyang Liu, Simeng Li, Ling Chen, Shujuan Hou
Summary: The high strain rate dynamic behavior and deformation-induced microstructural evolution of additively manufactured 316L stainless steel were investigated in this study. The study found that AM 316L SS exhibited enhanced mechanical strength under quasi-static compression and nearly rate-insensitive responses under dynamic shearing. The study also analyzed the localized deformation and associated structural evolution.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Y. L. Bian, Z. D. Feng, N. B. Zhang, Y. X. Li, X. F. Wang, B. B. Zhang, Y. Cai, L. Lu, S. Chen, X. H. Yao, S. N. Luo
Summary: This study investigates the processing of a high-entropy alloy through dynamic equal channel angular pressing (D-ECAP) and subsequent annealing, and observes the occurrence of kink bands within a face-centered cubic HEA. The strengthening mechanisms are discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhen Zhang, Zhanyong Zhao, Xiaofeng Li, Liqing Wang, Bin Liu, Peikang Bai
Summary: The effect of heat treatments on the metastable pitting of 316L stainless steel fabricated by selective laser melting (SLM) was studied. The results showed that the heat treatment resulted in changes in the structure and inclusions of the stainless steel, leading to a decrease in pitting performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Mechanics
A. Yu. Iziumova, A. N. Vshivkov, A. E. Prokhorov, I. A. Panteleev, V. A. Mubassarova, O. A. Plekhov, M. L. Linderov, D. L. Merson, A. Vinogradov
Summary: The study reveals the features of heat dissipation and acoustic emission during fatigue crack growth in titanium alloy, proposing a relationship model between crack growth rate and heat dissipation rate. Two dominant stress relaxation mechanisms were identified ahead of the crack tip, while the correlation between acoustic emission energy and heat dissipation was found to signal the transition from stable to unstable crack growth.
Article
Nanoscience & Nanotechnology
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: The study found that increasing strain rate after pre-exposure treatment can enhance the ductility of the ZK60 alloy. Contrary to conventional beliefs, the mechanism of PESCC is associated with a corrosion products layer containing sealed corrosive media, rather than diffusible hydrogen.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
I. S. Yasnikov, Y. Kaneko, M. Uchida, A. Vinogradov
Summary: By revisiting the strain hardening behavior from the perspective of an analytical model based on the evolution of dislocation density with strain, the study extended the capacity of the single internal variable model to predict necking instability and re-examined the influence of grain size on flow stress. The analysis highlighted the significance of dynamic recovery in necking occurrence and emphasized the validity of using simple modeling of dislocation density evolution for predicting stress-strain behavior and necking instability onset.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Mikhail Linderov, Alexander Brilevsky, Dmitry Merson, Alexei Danyuk, Alexei Vinogradov
Summary: Magnesium alloys, especially in medical applications, face challenges due to their poor resistance to environmentally assisted fracture and bio-corrosion degradation. This study focuses on the corrosion fatigue behavior of a popular Mg-Zn-Zr alloy, specifically examining the effects of testing frequency, surface roughness, and metallic coatings. The results demonstrate that the occurrence of corrosion fatigue in Mg alloys is influenced by multiple factors, showing a complicated interplay between corrosion damage, stress corrosion cracking, and cyclic loads.
Article
Materials Science, Multidisciplinary
E. D. Merson, V. A. Poluyanov, P. N. Myagkikh, D. L. Merson, A. Yu Vinogradov
Summary: This study aims to find additional evidence for the presence of retained corrosive media in the corrosion products layer deposited on the surface of the ZK60 alloy. The main finding is that the corrosion reaction remains within ZK60 samples even after they are extracted from the corrosive solution, indicating the presence of aggressive media retained within the corrosion products layer.
LETTERS ON MATERIALS
(2022)
Article
Chemistry, Analytical
Einar Lovli Hidle, Rune Harald Hestmo, Ove Sagen Adsen, Hans Lange, Alexei Vinogradov
Summary: This paper proposes a knowledge-based data analysis algorithm for health condition monitoring in rotating machinery, specifically targeting the early detection of subsurface cracks induced by contact fatigue. A robust fault detector is introduced and its efficacy is demonstrated through a long-term durability test on a case-hardened steel roller. The reliability of subsurface crack detection is confirmed by independent periodic ultrasonic inspections. Subsurface cracks as small as 0.5mm are identified and their steady growth is tracked using the proposed acoustic emission (AE) technique. Challenges and future prospects of this methodology are discussed.
Article
Materials Science, Multidisciplinary
Yu Ding, Haiyang Yu, Meichao Lin, Kai Zhao, Senbo Xiao, Alexey Vinogradov, Lijie Qiao, Michael Ortiz, Jianying He, Zhiliang Zhang
Summary: An atomistic study was conducted on the intergranular fracture pathway of nickel, revealing the coupled effect of hydrogen and deformation temperature on vacancy generation and intergranular fracture. The results are in good agreement with recent experiments, and a quantitative correlation between the proportion of intergranular fracture and vacancy concentration was derived for the first time.
Article
Nanoscience & Nanotechnology
A. Sendrowicz, A. O. Myhre, A. V. Danyuk, A. Vinogradov
Summary: This study investigates the energy dissipation and storage during strain hardening of metals using complementary in situ techniques. A thermodynamic modelling approach based on a dislocation evolution method is proposed and experimentally verified. The results agree with existing models and demonstrate the self-consistency and predictive capacity of the proposed approach.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
E. D. Merson, V. A. Poluyanov, P. N. Myagkikh, D. L. Merson, A. Yu. Vinogradov
Summary: The effect of chemical composition, temperature, circulation, and pH of simulated body fluid (SBF) on the corrosion and stress corrosion cracking (SCC) susceptibility of alloy ZK60 was investigated. The study found that chemical composition and pH adjustment of SBF significantly affected the corrosion and SCC susceptibility of the alloy, while temperature and circulation had a minor effect. pH adjustment decreased the corrosion rate and increased the SCC susceptibility of the alloy. The experimental factors considered in this study should be taken into account for reliable assessment of the corrosion and SCC resistance of biomedical Mg alloys.
LETTERS ON MATERIALS
(2022)
Review
Chemistry, Physical
Alexei Vinogradov, Evgeniy Merson, Pavel Myagkikh, Mikhail Linderov, Alexandr Brilevsky, Dmitry Merson
Summary: This article provides an overview of achievements and knowledge gaps in the field of biodegradable magnesium alloys. It focuses on the popular Mg-Zn-Ca system as a representative example. The article reviews processing techniques and functional properties achieved through various processing routes. It also discusses corrosion properties, mechanical-chemical interactions, and challenges faced by researchers in this area.
Article
Chemistry, Physical
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: This study aimed to clarify the healing mechanism of Mg alloys exposed to corrosion solutions and stored in air, showing that PESCC gradually reduced and was eventually suppressed with increasing time and temperature of air storage. Recovery of elongation and complete elimination of PESCC were achieved after 24 hours of air storage at 150-200 degrees C, indicating the role of corrosion solution and hydrogen in forming specific zones on the fracture surface.
Article
Materials Science, Multidisciplinary
E. D. Merson, V. A. Poluyanov, A. Polunin, P. N. Myagkikh, D. L. Merson, A. Yu. Vinogradov
Summary: Preliminary immersed magnesium alloys suffer from pre-exposure stress corrosion cracking (PESCC) due to corrosion product film-induced stress (CPFIS). However, the internal residual stresses associated with corrosion product layer formation have not been investigated. In this study, the internal residual stresses of alloy ZK60 exposed to corrosion solution were evaluated using deflection and X-ray diffraction techniques. It was found that CP deposition on ZK60 alloy surface creates compressive internal stresses of both kinds - I and II. Macro residual stress of kind I does not exceed 3 MPa, while micro residual stress of kind II in the surface layer can be as high as 290 MPa.
LETTERS ON MATERIALS
(2023)
Article
Chemistry, Physical
Chandrahaasan K. Soundararajan, Dong Wang, Alexey Vinogradov
Summary: This study investigates the nanomechanical properties of Inconel 625 alloy under a hydrogen environment through in-situ electrochemical nanoindentation experiment. The hydrogen effect on various stages of the load-displacement plot is quantified, and it is found that hydrogen charging reduces the pop-in load and pop-in width, indicating hindered dislocation glide. The study also examines hydrogen-induced slip line formation and nanohardness variation using a diffusion-desorption model, and investigates the difference in plastic behavior between air and hydrogen environments through electron channeling contrast imaging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Computer Science, Artificial Intelligence
Yu Wang, Alexey Vinogradov
Summary: This paper proposes a simple and easy-to-implement ensemble approach, the history-state ensemble (HSE) method, which leverages the "local sub-optima" of deep networks to improve the performance of deep neural networks. It is demonstrated that neural networks can naturally generate multiple diverse "local sub-optima" during training, and their combination can effectively enhance the accuracy and stability of a single network. The advantages of HSE include no additional training cost for acquiring multiple base models and applicability to any types of deep networks without tuning of network architectures.
Article
Chemistry, Physical
Dmitry Merson, Mikhail Linderov, Alexander Brilevsky, Alexey Danyuk, Alexei Vinogradov
Summary: The tensile behavior of a biocompatible alloy in a fine-grained state was investigated using acoustic emission (AE) measurements. It was found that the AE method is an effective tool for in situ monitoring of the dynamic recrystallization (DRX) process.
