The impact of microstructural refinement on the tribological behavior of niobium processed by Indirect Extrusion Angular Pressing

2021 ◽  
pp. 107412
Author(s):  
Babak Omranpour Shahreza ◽  
Marco A.L. Hernandez-Rodriguez ◽  
Edgar Garcia-Sanchez ◽  
Lembit Kommel ◽  
Fjodor Sergejev ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
The Impact

scholarly journals Effects of equal channel angular pressing and heat treatments on the microstructures and mechanical properties of selective laser melted and cast AlSi10Mg alloys

2021 ◽  
Vol 21 (3) ◽  
Author(s):  
Przemysław Snopiński ◽  
Mariusz Król ◽  
Marek Pagáč ◽  
Jana Petrů ◽  
Jiří Hajnyš ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Equal Channel Angular Pressing ◽  
Heat Treatments ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Before And After ◽  
The Impact

AbstractThis study investigated the impact of the equal channel angular pressing (ECAP) combined with heat treatments on the microstructure and mechanical properties of AlSi10Mg alloys fabricated via selective laser melting (SLM) and gravity casting. Special attention was directed towards determining the effect of post-fabrication heat treatments on the microstructural evolution of AlSi10Mg alloy fabricated using two different routes. Three initial alloy conditions were considered prior to ECAP deformation: (1) as-cast in solution treated (T4) condition, (2) SLM in T4 condition, (3) SLM subjected to low-temperature annealing. Light microscopy, transmission electron microscopy, X-ray diffraction line broadening analysis, and electron backscattered diffraction analysis were used to characterize the microstructures before and after ECAP. The results indicated that SLM followed by low-temperature annealing led to superior mechanical properties, relative to the two other conditions. Microscopic analyses revealed that the partial-cellular structure contributed to strong work hardening. This behavior enhanced the material’s strength because of the enhanced accumulation of geometrically necessary dislocations during ECAP deformation.

Effect of Severe Plastic Deformation and Hardening on the Properties and Failure Mechanisms of Constructional Steel

2019 ◽  
Vol 945 ◽  
pp. 579-584
Author(s):  
Maria Z. Borisova
Keyword(s):  
Plastic Deformation ◽  
Impact Strength ◽  
Severe Plastic Deformation ◽  
Structural Steel ◽  
Negative Impact ◽  
Failure Mechanisms ◽  
Positive Influence ◽  
Constructional Steel ◽  
Angular Pressing ◽  
The Impact

The influence of severe plastic deformation on structural materials has been actively studied in recent years. Undoubtedly is the positive influence of this method on strength characteristics of materials. In addition, it is very interesting to influence of the severe plastic deformation on the mechanisms of fracture. One of the most common methods of severe plastic deformation is equal-channel angular pressing (ECAP). In this paper, the influence of different modes of ECAP on the strength of structural steel was studied. Also, the destruction of steel at different test temperatures was studied in detail. It is shown that the ECAP increases the strength of steel almost twice, but the plasticity of steel is reduced, which leads to fragility. Quenching can remove the negative impact of the ECAP on toughness of the steel and will increase the impact strength several times.

The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals

Exacta ◽  
2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Vicente Braz da Trindade ◽  
João Da Cruz Payão ◽  
Luís Felile Guimarães Souza ◽  
Ronaldo Da Rocha Paranhos
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
Nickel Content ◽  
Stress Relief ◽  
Impact Testing ◽  
Microstructural Refinement ◽  
Weld Metals ◽  
The Impact ◽  
Submerged Arc

The aim in this work is to study the influence of nickel content (as-welded state and after stress relief heat treatment) on the microstructure and toughness of CMn weld metals obtained with submerged arc welding. The nickel content vary between 0.50 wt.% and 3.11 wt.%. The microstructures were observed using optical microscopy (OM) and scanning electron microscopy (SEM). The toughness was evaluated by Charpy-V impact testing in samples cut transversally to the weld bead. The impact energy showed that nickel content up to 1 wt.% improves the toughness due to the increase of the acicular ferrite (AF) content and microstructural refinement. On the other hand, higher nickel contents have a deleterious effect on the toughness due to the presence of the microconstituent martensite-austenite (M-A) in the weld metal. The stress relief heat treatment did not improve too much the weld metal toughness, even the M-A suffering decomposition (ferrite+carbide). This may be explained by the precipitation of carbides along the boundaries of the ferrite.

Microstructures and Tensile Properties of Maraging Steel Processed by Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 421-426 ◽  
Author(s):  
M.X. Yang ◽  
Gang Yang ◽  
Zheng Dong Liu ◽  
Cun Yu Wang ◽  
C.X. Huang
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Maraging Steel ◽  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Aging Treatment ◽  
Subsequent Aging ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
Narrow Bands

An 18Ni (C-250) maraging steel was successfully processed by equal channel angular pressing (ECAP) for a single pass at room temperature. Microstructural observations showed that the martensite laths of 18Ni maraging steel were elongated to more narrow bands with a width of 100-200 nm after ECAP deformation. After ageing treatment, many nano-sized precipitates distributed uniformly within the refined martensite lathes. In comparison with the tensile strength (1940 MPa) of general used steel (solution + aging treatment), the tensile strength of the sample processed by ECAP and subsequent aging treatment was enhanced for more than 100 MPa (above 2050 MPa). The enhancement of tensile properties was attributed to microstructural refinement and uniformly distributed nano-precipitates.

Specific Features of Static, Impact, and Fatigue Fracture of the 0.09%C-0.08%Mo-0.03%Nb-0.06%V Steel with Ultrafine-Grained Structure

2008 ◽  
Vol 584-586 ◽  
pp. 281-286 ◽  
Author(s):  
L.R. Botvina ◽  
Marat R. Tyutin ◽  
V.P. Levin ◽  
Y.A. Demina ◽  
I.A. Panteleev ◽  
...  
Keyword(s):  
Tensile Tests ◽  
Dynamic Fracture Toughness ◽  
Fracture Mechanisms ◽  
Plastic Deformation Zone ◽  
Initial Structure ◽  
Initial State ◽  
Surface Microrelief ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
The Impact

The mechanical properties and fracture mechanisms of the 0.09%C-0.08%Mo-0.03%Nb- 0.06%V steel in the initial state and with the ultrafine-grained (UFG) structure obtained by equalchannel angular pressing (ECAP) have been estimated. The investigation included the static and cyclic tensile tests, the impact tests at room and lower temperatures with automatic recording of force-displacement diagram, and the analysis of both the fracture surface microrelief and the evolution of plastic deformation zone by replica method. It is established that the grain refinement increases the ultimate strength and yield strength, but decreases plasticity and impact toughness and raises fatigue growth rate and the critical temperature of ductile–brittle transition. The dynamic fracture toughness of the material after ECAP as compared with that of the material with the initial structure decreases due to the raising of the critical brittleness temperature.

Preparation and Tribological Behavior of Carbon Fiber Reinforced Pantograph Slide Plate

2012 ◽  
Vol 430-432 ◽  
pp. 378-382 ◽  
Author(s):  
Hua Yuan ◽  
Cheng Guo Wang ◽  
Wen Bo Lu ◽  
Shan Zhang
Keyword(s):  
Carbon Fiber ◽  
Cross Section ◽  
Mass Fraction ◽  
Phenolic Resin ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Structural Characteristics ◽  
Electric Resistance ◽  
Continuous Carbon Fiber ◽  
The Impact

The carbon fiber (CF) reinforced pantograph sliding plates were fabricated by hot pressing with modified phenolic resin as bonder, and the continuous carbon fiber, copper and graphite respectively were reinforcing phase, electric conductive phase and lubricating phase, respectively. The impact toughness, electric resistance and wear resistance of the slide plate were tested. The structural characteristics of the pantograph sliding plates were investigated by scanning electron microscopy (SEM). The results show that the addition of CF mass fraction can increase impact strength and density; while resistivity has a lower trend; the volume abrasion loss and friction coefficient are decreased then increased dramatically. The fiber and resin interface adhesion is good for specimen impact cross section smooth. In addition, adhesive wear and abrasive wear are the main wear form of pantograph slide plates.

Investigation on Three-Dimensional Microstructures and Tensile Properties of Pure Iron during Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 791-796
Author(s):  
Gang Yang ◽  
Mu Xin Yang ◽  
Zheng Dong Liu ◽  
Chang Wang ◽  
Chong Xiang Huang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Band Structure ◽  
Equal Channel Angular Pressing ◽  
Pure Iron ◽  
Three Dimensional ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
Transmission Electron

Commercial pure iron billets having diameter of 60 mm and length of 180 mm were subjected to equal channel angular pressing (ECAP) at 350 °C for 1-4 passes via route BC. Microstructural evolutions on three planes (X, Y, Z planes) were characterized by optical microscopy and transmission electron microscopy (TEM). It was found that after four passes an ultrafine microstructure could be formed on the X plane, but a band structure remained on the Z plane. Accordingly, the mechanical properties exhibited apparent dependence on the orientations. The strength in the X and Y directions was higher than that in the Z direction. The microstructural refinement and mechanical properties were discussed in terms of experimental results.

Effect of Ceramic and Metallic Reinforcement on Mechanical, Corrosion, and Tribological Behavior of Aluminum Composite by Adopting Design of Experiment Through Taguchi Technique

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
P. Sureshkumar ◽  
V. C. Uvaraja
Keyword(s):  
Coefficient Of Friction ◽  
Design Of Experiment ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Corrosion Properties ◽  
Aluminum Composite ◽  
Weight Percentage ◽  
Fixed Weight ◽  
Metallic Reinforcement ◽  
The Impact

An attempt has been made to develop and study the properties and behavior of structure-based aluminum composite. Aluminum (AA6063)-based composites were fabricated by stir casting technique (also known as liquid metallurgy route) by varying weight percentage of metallic-based copper nitrate Cu (NO3)2 with fixed proposition of ceramic-based silicon nitride (Si3N4) reinforcement. The mechanical and corrosion properties and tribological behavior of composite were studied. Further, the sample microstructure and characterizations were investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD) technique. The composite with fixed weight proportion of ceramic and higher metallic reinforced samples shows higher tensile strength, improved corrosion resistance, and higher hardness behavior. Due to higher hardness nature, the tribological properties of composite such as wear rate and coefficient of friction have been reduced. Moreover, the impact strength of composite decreased due to combination of ceramic and metallic reinforcement. In addition to the above study, design of experiment (DOE) was adopted to optimize the major wear test parameters such as percentage of reinforcement, applied load, sliding distance, and sliding speed. Finally, analysis of variance (ANOVA) was carried out to identify the most significant test parameter and its interaction affecting wear behavior and its coefficient of friction of composite sample.

scholarly journals The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals DOI: 10.5585/exacta.v5i1.1037

Exacta ◽  
2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Vicente Braz da Trindade ◽  
João Da Cruz Payão ◽  
Luís Felile Guimarães Souza ◽  
Ronaldo Da Rocha Paranhos
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
Nickel Content ◽  
Stress Relief ◽  
Impact Testing ◽  
Microstructural Refinement ◽  
Weld Metals ◽  
The Impact ◽  
Submerged Arc

The aim in this work is to study the influence of nickel content (as-welded state and after stress relief heat treatment) on the microstructure and toughness of CMn weld metals obtained with submerged arc welding. The nickel content vary between 0.50 wt.% and 3.11 wt.%. The microstructures were observed using optical microscopy (OM) and scanning electron microscopy (SEM). The toughness was evaluated by Charpy-V impact testing in samples cut transversally to the weld bead. The impact energy showed that nickel content up to 1 wt.% improves the toughness due to the increase of the acicular ferrite (AF) content and microstructural refinement. On the other hand, higher nickel contents have a deleterious effect on the toughness due to the presence of the microconstituent martensite-austenite (M-A) in the weld metal. The stress relief heat treatment did not improve too much the weld metal toughness, even the M-A suffering decomposition (ferrite+carbide). This may be explained by the precipitation of carbides along the boundaries of the ferrite.

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