A5000220759- Metallic Glasses and Amorphous Alloys
- Fatigue and fracture mechanics
- Metal Alloys Wear and Properties
- Microstructure and Mechanical Properties of Steels
- Material Dynamics and Properties
- Material Properties and Failure Mechanisms
- Welding Techniques and Residual Stresses
- Additive Manufacturing Materials and Processes
- Ultrasonics and Acoustic Wave Propagation
- Surface Treatment and Residual Stress
- Theoretical and Computational Physics
- Non-Destructive Testing Techniques
- Aluminum Alloy Microstructure Properties
- High-Temperature Coating Behaviors
- Thermography and Photoacoustic Techniques
- Microstructure and mechanical properties
- Advanced Welding Techniques Analysis
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Engineering Technology and Methodologies
- Material Science and Thermodynamics
- Hydrogen Storage and Materials
- High Entropy Alloys Studies
- Material Properties and Applications
- Magneto-Optical Properties and Applications
TU Bergakademie Freiberg
2018-2024
Togliatti State University
2014-2020
Kazan Federal University
2014
The use of additive manufacturing (AM) and its particular realization – laser powder bed fusion (L-PBF) is on the rise. However, method not free from flaws, mainly represented by structural defects printed specimen, such as cracks pores, requiring processing monitoring. In this work, we propose a concept in situ crack detection system for AM fabricated parts based acoustic emission (AE) signal machine learning (ML) methods. implies differentiation AE events background noise sound. We...
Ultrasonic fatigue testing (USFT) is a time-efficient method for evaluation of the limit metallic alloys in high and very cycle range. Propagation final crack at end life can be clearly detected by USFT parameters monitoring techniques. In contrast, initiation damage during remains unclear. Despite its excellent sensitivity, implementation acoustic emission (AE) hindered severe noisiness signals from USFT. addition to resonance-related quasi-stationary noises, pulse-pause mode accompanied...
Carbon‐bonded ceramic foam filters with different functional coatings are immersed in a 42CrMo4 steel melt within casting simulator. The solidified is analyzed respect to the size distribution and chemical composition of remaining nonmetallic inclusions (NMI). Cyclic loading quasi‐static tests performed determine fatigue limit, strength, deformability, toughness after filter immersion. immersion calcium hexaluminate (CA6) coating significantly reduces population small (4–20 μm) NMIs. This...
Aiming at high speed video recording of rapid events, which occur in loaded solids with unpredictable timing, the efficient triggering method is proposed for optical imaging systems an aid from highly sensitive acoustic emission technique. The efficiency demonstrated on two examples: observation initiation and propagation localized shear bands metallic glasses mechanical twinning Mg polycrystals.
The impact of Co micro-alloying on low temperature specific heat capacity and the relaxation processes in a model Pd40Ni40P20 bulk metallic glass both as-cast cold-rolled states was investigated. In addition to an excess (Boson) peak at temperatures about 12 14 K, magnetic anomaly alloyed below 10 K observed. measured Boson heights fictive advocate much faster β micro-alloyed glass. Yet, does not measurably affect enthalpy associated with α-relaxation. shear bands thermodynamic properties is...
Recent progress in steel casting shows significant reduction of non‐metallic inclusions (NMIs). Unfortunately, total NMI volume due to refining can surprisingly lead size enlargement or cluster formation. This effect decreases the fatigue endurance limit steel, which is sensitive not only presence large NMIs, but also clusters small inclusions, are usually overlooked standard metallography inspection. In present paper, authors aim investigate clustering properties NMIs a dataset 42CrMo4...
Accumulative roll bonding (ARB) is a repeated cladding process in which two or more sheets of material are joined together by rolling at temperatures below recrystallization. The present review focused on ARB high‐alloy steels, which, among other laminated metal composites (LMCs), deliver the highest mechanical properties. After brief description high‐strength history, and state art LMCs, principal mechanism explained. Further, methodology steels variable parameters (stacking, temperature,...
Recent experimental studies revealed the presence of Volterra dislocation-type long-range elastic strain/stress field around a shear band (SB) terminated in bulk metallic glass (BMG). The corollary from this finding is that bands can interact with these stress fields. In other words, mutual behaviour SBs should be affected by their fields superimposed external stresses. order to verify suggestion, topography regions surrounding BMGs was carefully analysed. surfaces several BMGs, deformed...
Abstract A detailed microscopic analysis of fracture surfaces 42CrMo4‐hardened steel after ultrasonic fatigue testing revealed globular and cylindrical particles located in ridges along the crack propagation direction. Observed could be easily taken for non‐metallic inclusions; however, chemical showed that they are same composition as matrix. The formation such round‐shaped debris was found to a result cutting out matrix fragments by ‘en passant’ cracks interaction their subsequent fretting...
For the first time a four-layered laminate made of X5CrMnNi-16-6-6 (TRIP steel) and X5CrMnNi16-6-9 (TWIP was manufactured by accumulative roll bonding (ARB). An intermediate annealing between rolling passes allowed to achieve good layers. The microstructure at each step production analysed with main focus on interface deformation lenses means scanning electron microscopy, including chemical orientation mapping techniques, microhardness measurements. Additionally, special measuring routine...
The influence of Co micro-alloying (1 at. %) on the shear band diffusion and relaxation processes in a model PdNiP bulk metallic glass is investigated. bands are induced by one-pass cold-rolling. In addition to fast branch (Dsb≃10−16m2/s at 473 K), with diffusivity being similar that observed for cold-rolled standard Pd40Ni40P20 composition, an ultrafast (Dsb≃10−14m2/s same temperature) found exist micro-alloyed glass. Combined previously reported observations faster both Boson peak height...
Recent progress in steel refining shows significant reduction of non-metallic inclusions (NMIs) which alumina (Al2O3) is one the most problematic. Among other methods, metal melt filtration by ceramic foam filters promising results cleaning. In present work influence on fatigue behavior investigated after reaction with filters. Different batches are compared where carbon-bonded different coatings were introduced into 42CrMo4 for 10 s (so called "finger test"). Fatigue tests performed using...
The purpose of this work is to study the influence four-magnon (4M) parametric instability on spin pumping by dipole-exchange magnetostatic surface waves (MSSW) with help inverse Hall effect (ISHE) in structures based yttrium-iron garnet (YIG) and platinum (Pt). Methods. experiments were carried out using delay line YIG(900 nm)/Pt(9 nm) where electromotive force (EMF) induced ISHE demonstrates a growth at frequencies resonant interaction between MSSW volume exchange modes. frequency...
The combination of strength transformation-induced plasticity (TRIP) steel and ductility twinning-induced (TWIP) can be achieved by manufacturing laminated composites via cold roll bonding (CRB). Work hardening the surface before CRB produces deformation lenses (DLs), which play significant role in bonding, but are reported rarely literature. present work aimed to study DLs at interface composite made high-alloy TRIP TWIP steels manufactured CRB. interfaces were investigated means scanning...
Very high cycle fatigue (VHCF) is caused by the growth of an internal crack in materials under stresses below standard limit and number cycles beyond 10 7 . The fracture surface steels alloys after VHCF can be divided into distinct zones, such as fine granular area (FGA) so-called “fisheye”. Differences morphology numerically estimated roughness parameter. Murakami Y. et al. showed that magnitude linear Ra proportional to stress intensity factor, whereas Shiozawa K. measured within FGA...