Article
Engineering, Mechanical
Hugo Warner, Jinghao Xu, Guocai Chai, Johan Moverare, Mattias Calmunger
Summary: The study found that coherent Cu-precipitates and incoherent Nbcarbides in Sanicro 25 hinder dislocation motion, increase hardening, and improve high temperature properties, while sparsely placed intergranular Cr- and Nb-carbides in Esshete 1250 make it susceptible to creep damage and intergranular crack propagation. Dynamic recrystallization of the plastic zone at the crack tip seemed to affect crack propagation of Sanicro 25 by providing an energetically privileged path.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
J. Li, C. Xu, G. Zheng, W. J. Dai, C. C. Bu, G. Chen
Summary: The study has found that the premature failure of enhanced creep strength martensitic steels in ultra-supercritical plants is mainly caused by the microstructural evolution of martensite and carbides. Using the multi-step TTP-LMP method, a three-stage creep rupture behavior under different stress regions has been confirmed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Mechanics
Yanyan Huang, Xiaowu Luo, Yucun Zhan, Yan Chen, Liping Yu, Wei Feng, Jiankun Xiong, Jianping Yang, Guijun Mao, Lin Yang, Fuheng Nie
Summary: This study investigates the creep rupture behavior and microstructure changes of dissimilar welded joints of two types of martensitic heat resistant steel: F92 and Co3W2. The results indicate that the fracture position and mode change from transgranular ductile fracture in parent F92 to intergranular brittle fracture in the fine grain heat affected zone near F92, with the decrease of applied stress. The study also reveals the microstructural degradation caused by creep, including the decrease in dislocation density, precipitates coarsening, formation of dislocation cells, microvoids, macroscopic secondary cracks, and changes in fracture surface morphology.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Le Xu, Run-Zi Wang, Yu-Chen Wang, Lei He, Takamoto Itoh, Ken Suzuki, Hideo Miura, Xian-Cheng Zhang
Summary: Strain-controlled non-proportional creep-fatigue tests were conducted on type 304 stainless steel, with a focus on the effect of holding position and loading path on creep damage accumulation. The circle loading path was found to have the most detrimental effect on material life, and the introduction of a holding period further reduced the material life. Electron backscattered diffraction (EBSD) observations revealed the damage mechanisms under different loading paths, and the variations of EBSD-based misorientation parameters showed the significant effect of loading path and holding position. A collaboration of the multiaxial damage factor (MDF)-involved strain energy density exhaustion (SEDE) model and the non-proportional energy parameter (NPEP)-involved Ostergren model provided a precise prediction for non-proportional creep-fatigue life distributions within a factor of 1.5.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
S. M. Fatemi, A. A. Kazemi Asl, H. Paul
Summary: The study investigated the effects of pretwins on the flow behavior, microstructure, and texture evolution of a rolled AZ31 magnesium alloy during hot deformation. It was found that pretwins influenced texture reorientation and dynamic recrystallization, leading to changes in flow behavior and microstructure along different directions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Mechanical
Kai Song, Kaimeng Wang, Lei Zhao, Lianyong Xu, Ninshu Ma, Yongdian Han, Kangda Hao, Libin Zhang, Yalin Gao
Summary: The cyclic responses of a heat resistant martensitic steel, 9Cr3Co3W1CuVNbB steel, were studied under different loading modes to understand its complex strengthening mechanisms at high temperature. The main mechanisms for its excellent fatigue and creep-fatigue properties were found to be dislocation strengthening, precipitation strengthening by M23C6 phase, MX phase, Cu-rich phase, and subgrain boundary strengthening. Based on these observations, a physically-based constitutive model was proposed to consider various micromechanical mechanisms for fatigue and creep-fatigue tests. Three ways for dislocation annihilation and the effect of Cu-rich phase were also modeled. The proposed model was verified through comparison with cyclic responses, hysteresis loops, stress relaxation, and dislocation density evolution.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
Bernd M. Schoenbauer, Suraj S. More, Guillermo E. Morales-Espejel, Herwig Mayer
Summary: The influence of temperature on the very high cycle fatigue properties of three high carbon chromium bearing steels (52100, 52100-VIM/VAR and M50-VIM/VAR) was investigated. Interior defect-initiated cracking was the dominant failure mechanism at all temperatures. Nonmetallic inclusions were the origin of fracture for 52100 while carbides were the origin for 52100-VIM/VAR and M50-VIM/VAR. The fatigue strength at 300°C decreased significantly compared to 22°C, with 52100 steels experiencing a decrease of 56-57% and M50 a decrease of 41%.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Metallurgy & Metallurgical Engineering
Michal Junek, Marie Svobodova, Jakub Horvath, Vladimir Mara
Summary: This study focuses on the analysis of microstructure degradation and mechanical property degradation of P91 and P92 steels in orbital narrow-gap welding. It reveals that using orbital narrow-gap tungsten inert gas welding technology can improve welding efficiency and repeatability.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Gerosa Riccardo, Barbara Rivolta, Carlo Gorla, Franco Concli
Summary: The present experimental work investigated the isothermal low cycle fatigue resistance of two well-known tool steels, AISI H11 and AISI H13, at different temperatures. It was found that at 550 degrees C fatigue and oxidation are the main driving mechanisms, with multiple crack nucleation observed at high temperatures.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Yang Liu, Suki Adande, Thomas Benjamin Britton, Fionn P. E. Dunne
Summary: Cold dwell fatigue is an important life-limiting factor in aircraft engine titanium alloys, controlled by strain rate sensitivity. This study investigates the relationship between crystal-level slip properties and microstructure-sensitive cold dwell debit in forged rotor graded Ti-6Al-4V alloy, predicting dwell effect diminishing to zero below a peak applied stress of about 790 MPa. The experiments extract slip strengths and anisotropic strain rate sensitivities for different slip systems, providing insights into the mechanisms of cold dwell fatigue.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Hailing Wang, Qiang Wang, Hongsheng Ding, Ruirun Chen, Liangcai Zeng
Summary: Research on the high-temperature tensile properties and deformation behaviors of directionally solidified Ti-45Al-5Nb-2Mn alloy showed that increasing the tensile temperature led to brittle-ductile transition and the main cracks propagated along a tortuous path with multiple secondary cracks formed adjacent to them. The dislocation mechanism controlled the high-temperature tensile deformation, and the lamellae exhibited different deformation characteristics at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Dong Wu, Qinyi Zhang, Wei Liu
Summary: This study compares the performance of different commercial high carbon martensitic stainless steel blades in terms of sharpness retention by varying the content of alloying elements. It was found that 154CM with higher hardness demonstrated superior capability. Further investigations using SEM and nanoindentation suggested that the quicker deterioration of sharpness in 440C and N690 may be due to fatigue peeling of carbides, aggravated by modulus mismatch between carbide particles and the martensitic steel matrix.
Article
Materials Science, Multidisciplinary
Guhui Gao, Rong Liu, Yusong Fan, Guian Qian, Xiaolu Gui, R. D. K. Misra, Bingzhe Bai
Summary: This study investigates the fatigue crack initiation behavior of advanced bainitic steels during high cycle fatigue/very high cycle fatigue regimes and the role of retained austenite in crack initiation and propagation. The study identifies multiple micro-mechanisms responsible for fatigue crack initiation and discusses the formation of fine grains that assist crack advancement. The findings provide insights into the cyclic response of multiphase structures and the mechanisms of fatigue crack initiation during very high cycle fatigue.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Nadezhda Dudova
Summary: This paper provides an overview of the creep strength and microstructural features of 9% Cr and 10-12% Cr martensitic steels with high B and low N contents, achieved through modifying the chemical composition. The optimal B/N ratio in steels is discussed, and the creep properties are compared with those of traditional B and N content steels. The relationship between the stability of lath structure and precipitates and the creep strength of steels is also explored, along with future prospects of this alloying modification.
Article
Materials Science, Multidisciplinary
Nagarjuna Remalli, Mathias Munch, Mohsin Hasan, K. Nanda Kishore, Felix Stern, Nikolas Baak, Frank Walther, Manjini Sambandam, Steffen Klapprott, Koteswararao Rajulapati, Robert Brandt
Summary: Despite the well-known fact of low temperature creep deformation in high strength steels, its rate controlling mechanism remains unclear. This study experimentally validates the exhaustion creep model for low temperature creep behavior in SAE 9254 spring steel and proposes a hypothesis that dislocation glide in the retained austenite phase predominantly contributes to low temperature creep strain. The reduction in creep rate with time is attributed to the exhaustion of this deformation mechanism by strain-induced martensitic transformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
D. Sornin, P. -F. Giroux, E. Rigal, D. Fabregue, R. Soulas, D. Hamon
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2017)
Article
Materials Science, Multidisciplinary
P. F. Giroux, F. Dalle, M. Sauzay, G. Perez, I. Tournie, V. Rabeau, J. Malaplate, T. Van Den Berghe, B. Fournier, A. F. Gourgues-Lorenzon
MATERIALS AT HIGH TEMPERATURES
(2010)
Article
Nanoscience & Nanotechnology
P. F. Giroux, F. Dalle, M. Sauzay, J. Malaplate, B. Fournier, A. F. Gourgues-Lorenzon
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2010)
Article
Nanoscience & Nanotechnology
M. F. Giordana, P. -F. Giroux, I. Alvarez-Armas, M. Sauzay, A. Armas, T. Kruml
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2012)
Article
Chemistry, Inorganic & Nuclear
E. Simondon, P-F Giroux, L. Chaffron, A. Fitch, P. Castany, T. Gloriant
SOLID STATE SCIENCES
(2018)
Article
Engineering, Industrial
Elodie Vasquez, Pierre-Francois Giroux, Fernando Lomello, Aziz Chniouel, Hicham Maskrot, Frederic Schuster, Philippe Castany
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2019)
Article
Engineering, Chemical
Elodie Vasquez, Pierre-Francois Giroux, Fernando Lomello, Matthieu Nussbaum, Hicham Maskrot, Frederic Schuster, Philippe Castany
Article
Materials Science, Multidisciplinary
Louis Lemarquis, Pierre-Francois Giroux, Hicham Maskrot, Philippe Castany
Summary: A method is proposed to accurately determine the activated twinning variant in the cold-rolling process of 316L stainless steel parts produced by L-PBF. The selection of twinning variant is based on Schmid factor computations using an effective Schmid factor specifically designed for cold-rolling. The study demonstrates the relevance of the Schmid factor in predicting the experimentally activated twinning variant and provides valuable insights on twinning activation in textured materials like L-PBF 316L steel through analysis of twinning Schmid factors in traction and compression.
Article
Automation & Control Systems
Aziz Chniouel, Pierre-Francois Giroux, Fernando Lomello, Pascal Aubry, Elodie Vasquez, Olivier Hercher, Hicham Maskrot
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Proceedings Paper
Engineering, Multidisciplinary
M. F. Giordana, P. -F. Giroux, I. Alvarez-Armas, M. Sauzay, A. Armas
11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL BEHAVIOR OF MATERIALS (ICM11)
(2011)
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)
