Article
Engineering, Mechanical
D. F. Martelo, R. Morana, R. Akid
Summary: The effect of hydrogen on the mechanical behavior of UNS N07718 and UNS N07716 nickel based super-alloys was studied, showing an increase in susceptibility to hydrogen embrittlement with an increase in volume fraction of precipitates. Alloy 625+ displayed higher susceptibility to hydrogen embrittlement compared to alloy 718.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Yuhei Ogawa, Kohei Noguchi, Osamu Takakuwa
Summary: This study investigated the tensile mechanical properties of a Ni-based superalloy 718 precharged with approximately 90 mass ppm hydrogen under a wide range of temperatures, aiming to clarify the uncertainties surrounding the hydrogen-related embrittlement mechanisms of the material. The study found that hydrogen had a substantial detrimental effect on the ductility of the material in the near-ambient to high-temperature range, resulting from microcrack initiations along annealing twin boundaries and crystallographic slip planes. Additionally, the study revealed that the dynamic hydrogen-dislocation interaction was not important for embrittlement. By combining the insights gained from the test program, a new model for the nucleation process of hydrogen-induced fracturing was established.
Article
Chemistry, Physical
Song Huang, Hu Hui
Summary: A practical numerical model with few parameters is proposed in this study for predicting environmental hydrogen embrittlement. The model employs a hydrogen enhanced plasticity-based mechanism in a fracture strain model to describe hydrogen embrittlement. The fracture toughness degradation of three commercial steels in a high pressure hydrogen environment is investigated, and the governing equations for hydrogen distribution and material damage evolution are established. The model parameters are determined based on experimental results, and the predicted fracture toughness reductions are compared with experimental results, showing reasonable accuracy. The proposed method aims to achieve a balance between accurate prediction and practicality for engineering applications, providing a simplified numerical tool for the design and evaluation of hydrogen storage vessels.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Shaolou Wei, Cemal Cem Tasan
Summary: In this study, the contribution of grain boundary-mediated deformation phenomena to damage development in CoCrFeNiW-C alloy at elevated temperatures was investigated. In situ scanning electron microscope-based tensile tests were conducted within the temperature range of 650-750 degrees C, using nominal strain rates of 10-3 and 10-4 S-1. Intergranular fracture was observed at 700 and 750 degrees C under a strain rate of 10-4 S-1, followed by a transition from serrated to stable plastic flow. A Rachinger-type grain boundary sliding mechanism was confirmed at 750 degrees C under a strain rate of 10-4 S-1, which played a critical role in accelerating grain boundary damage nucleation. Deformation substructural studies revealed the involvement of dislocation cross-slip in accommodating grain boundary sliding.
Article
Chemistry, Physical
Joseph A. Ronevich, Eun Ju Song, Brian P. Somerday, Christopher W. San Marchi
Summary: This study measured the fracture resistance of pipeline welds from different strength grades and welding techniques in air and 21 MPa hydrogen gas. It was found that the fracture resistance of the welds decreased in hydrogen gas with increasing yield strength. Residual stress had a modest influence on fracture resistance, but further studies are needed to better understand its effects.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Qiang Li, Dongpo Wang, Caiyan Deng, Shipin Wu, Zhiwei Gao, Haiwei Zhao, Hang Liang
Summary: The effect of microstructure heterogeneity on hydrogen-assisted fracture toughness degradation in X80 weld metal was studied. The results showed that differences in microstructure heterogeneity do not affect corrosion resistance but do influence hydrogen embrittlement and fracture toughness. Increased microstructure heterogeneity and hydrogen content promote damage associated with enhanced plastic strain localization.
Article
Engineering, Mechanical
Muhammad Wasim, Milos B. Djukic, Tuan Duc Ngo
Summary: This study investigates the influence of hydrogen on the fracture toughness of low carbon steel in acidic environments over one year, developing models for the degradation of steel fracture toughness. The research has practical applications for assessing the durability of steel structures against hydrogen environmental assisted cracking, highlighting the synergistic activity of HELP and HEDE mechanisms and the importance of developing structures for storing hydrogen on a large scale.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Gyo-Geun Youn, Yun-Jae Kim, Jong-Sung Kim, Poh-Sang Lam
Summary: In this paper, a finite element simulation method based on the multi-axial fracture strain model is proposed to predict the effect of hydrogen embrittlement on fracture toughness in 21-6-9 stainless steel. The method is successfully applied to test data and shows close agreement with experimental results.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Review
Materials Science, Multidisciplinary
Thorsten Michler, Frank Schweizer, Ken Wackermann
Summary: The influence of hydrogen on the mechanical properties of structural alloys strongly depends on temperature, with a temperature T-HE,T-max where degradation of mechanical properties reaches a maximum. The lack of understanding of the underlying physico-mechanical mechanisms makes it difficult to explain the temperature effects. Statistical approaches may be suitable for accounting for the temperature effect in engineering applications.
Article
Engineering, Mechanical
A. Zafra, G. Alvarez, J. Belzunce, C. Rodriguez
Summary: This study investigated the suitability of 42CrMo4 steel for high pressure hydrogen gas applications, focusing on the influence of tempering time at 600 degrees C on hydrogen embrittlement sensitivity. Results showed that the fracture toughness of hydrogenated 42CrMo4 steel increased significantly with tempering time, correlated with hydrogen trap density in the steel. The study also identified brittle fracture micromechanisms through SEM analysis and gained insights into hydrogen-steel microstructure interaction using EHP tests.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Chemistry, Physical
Elena Astafurova, Anastasiya Fortuna, Evgenii Melnikov, Sergey Astafurov
Summary: The influence of strain rate on the tensile behavior, dislocation arrangement, deformation mechanisms, and fracture of hydrogen-charged austenitic stainless steel AISI 316L at room temperature was investigated. Hydrogen charging increased the yield strength of the specimens, but had little effect on deformation behavior and strain hardening of the steel. Hydrogen charging promoted surface embrittlement and reduced elongation to failure, both of which were strain rate-dependent parameters. The study also confirmed the importance of hydrogen transport with dislocations during plastic deformation.
Review
Chemistry, Physical
Hantong Wang, Zhi Tong, Guijuan Zhou, Ci Zhang, Hongyu Zhou, Yao Wang, Wenyue Zheng
Summary: This paper reviews the current status of demonstration projects for natural gas-hydrogen blending and pure hydrogen transportation, compares the material specifications for hydrogen pipeline systems from different regions, discusses the hydrogen compatibility of linepipe steels and the testing methods, and points out the inadequacies of the current standards.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Ju Li, Jiajiao Wei, Yunliang Shao, Mengjia Li, Xiaomei Yu, Jin You Zheng, Dehai Ping, Ke Hou, Zhipeng Chang, Feng Yang, Min Li, Songjie Li
Summary: The hydrogen embrittlement behaviors of two mining chain steels were investigated, and it was found that the fracture stress decreases linearly with increasing hydrogen content. The ratio of intergranular fracture area to quasi-cleavage area increases dramatically at the turning points.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Mechanics
A. Zafra, G. Alvarez, J. Belzunce, J. M. Alegre, C. Rodriguez
Summary: The study used laboratory heat treatments to obtain homogeneous coarse-grain tempered bainitic/martensitic microstructures for assessing the fracture behaviour in the presence of internal hydrogen in welds. The results showed that the hydrogen embrittlement experienced by the CGHAZs of both steels was considerably greater than in the base steels.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
A. Cayon, F. Gutierrez-Solana, B. Arroyo, J. A. Alvarez
Summary: In this study, two microalloyed steels were investigated under hydrogen embrittlement conditions, with different specimens tested to analyze mechanical properties and fracture micromechanisms. The impact of triaxiality on the HE behavior of the steel was revealed through the analyses conducted.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Manufacturing
L. F. Kanan, B. Vicharapu, D. R. Pissanti, C. E. F. Kwietniewski, T. Clarke, A. De
JOURNAL OF MANUFACTURING PROCESSES
(2020)
Article
Materials Science, Coatings & Films
Joao C. B. Bertoncello, Leonardo Simoni, Mariana R. Tagliari, Adriano Scheid, Marcelo T. P. Paes, Carlos E. F. Kwietniewski
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Metallurgy & Metallurgical Engineering
Renan Mensch Landell, Cleber Rodrigo de Lima Lessa, Luciano Bergmann, Jorge Fernandez dos Santos, Carlos Eduardo Fortis Kwietniewski, Benjamin Klusemann
Summary: The study investigated friction stir welding (FSW) in dissimilar material joining, specifically cladded plates of ASTM 572 steel and Inconel (R) 625. Utilizing a two-pass welding procedure, optimal welding parameters were identified to limit mixing between the materials and enhance corrosion resistance. The FSW process resulted in defect-free joints with improved mechanical properties due to microstructural rearrangement and the Hall-Petch effect.
WELDING IN THE WORLD
(2021)
Article
Chemistry, Physical
Leonardo Simoni, Tiago Falcade, Daniel C. F. Ferreira, Carlos E. F. Kwietniewski
Summary: The study investigates hydrogen diffusion and trapping in high-strength steel, using experimental data and a numerical model. It finds that more rigorous analysis methods provide improved predictions compared to general analytical approaches.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Diogo Trento Buzzatti, Luis Fernando Kanan, Giovani Dalpiaz, Adriano Scheid, Carlos Eduardo Fortis Kwietniewski
Summary: This work aims to optimize the impact toughness of pipeline girth friction welded steel joints by evaluating welding parameters and post-weld heat treatment. The results show that reducing heat input can restore part of the impact toughness, while post-weld heat treatment further improves the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Maximilian Kiehl, Adriano Scheid, Karin Graf, Benedikt Ernst, Ulrich Tetzlaff
Summary: This study utilized a high-power diode laser to generate Stellite (TM) 6 coatings on grey cast iron, and investigated the effects of different laser powers on bead geometry, dilution, microstructure, and hardness. The results showed that the coatings' dilution and composition were directly influenced by the laser power and bead geometry, while the hardness depended on the chemical composition and microstructure.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Review
Engineering, Mechanical
Maximilian Kiehl, Adriano Scheid, Karin Graf, Benedikt Ernst, Ulrich Tetzlaff
Summary: Environmental legislation and vehicle electrification have increased demands on brake disks, requiring improved wear and corrosion resistance. This study investigated the friction, wear, and corrosion properties of Stellite (TM) 6 coatings on gray cast iron. The experiments were conducted at different contact pressures and rotation speeds using a pin-on-disk tribometer. The microstructural and mechanical properties of the coatings and brake pad material strongly influenced the tribological behavior. The corrosion rate of Stellite (TM) 6 coatings increased with iron dilution but was lower compared to gray cast iron due to the formation of a protective passive layer.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2023)
Article
Mechanics
Joseane Ortiz Breitenbach Canterle, Pedro Martins Moraes, Ilson Palmieri Baptista, Adriano Scheid, Carlos Eduardo Fortis Kwietniewski
Summary: This study evaluated the susceptibility of API 5L X70 steel to stress corrosion cracking (SCC) in simulated fuel-grade ethanol (SFGE), corn, and sugar cane FGE. The results showed that API 5L X70 steel was sensitive to SCC in SFGE and corn FGE, but not susceptible to this cracking process in sugar cane FGE.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Alex Pizzatto, Moises Felipe Teixeira, Alexsandro Rabelo, Tiago Falcade, Adriano Scheid
Summary: This work evaluates the influence of laser power and reinforcement feeding rate on the microstructure, hardness, and wear behavior of NbC-reinforced Hastelloy C276TM alloy composite coatings. The study found that laser power and NbC feeding rate significantly impacted the coating's microstructure, hardness, and wear performance. Higher reinforcement feeding rates resulted in higher carbide fractions and improved wear performance of low heat-input specimens.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Lubar Eduardo Hortmann Santos Rivero, Alex Pizzatto, Moises Felipe Teixeira, Alexsandro Rabelo, Tiago Falcade, Adriano Scheid
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)