scholarly journals Improving of Mechanical Properties of Titanium Alloy VT23 due to Impact-Oscillatory Loading and the Use of Carbon Nano-Solution

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 652
Author(s):  
Mykola Chausov ◽  
Oleg Khyzhun ◽  
Janette Brezinová ◽  
Pavlo Maruschak ◽  
Andrii Pylypenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Titanium Alloy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
High Strength ◽  
Surface Layers ◽  
Two Phase ◽  
X Ray ◽  
Alloy Vt23

Improvement in the mechanical properties of sheet two-phase high-strength titanium alloy VT23 due to impact-oscillatory loading and the use of carbon nanosolutions at room temperature was tested experimentally. It was shown that in addition to obtaining a significant increase in the initial plastic deformation of the alloy, it is possible to strengthen the surface layers of the alloy by a factor of 8.4% at a time via the impulse introduction of energy into the alloy and the use of carbon nanosolutions. Using X-ray photoelectron spectroscopy (XPS), it was first found that strengthening of the surface layers of the titanium alloy at a given load, in line with using a carbon nanosolution, leads to the formation of a mixture of titanium oxide and titanium carbide or oxycarbide of type TiO2−xCx on the surface.

Effect of Hot Processing on Mircrostructure and Properties of Flat Billets of TA15 Titanium Alloy

2021 ◽  
Vol 1016 ◽  
pp. 906-910
Author(s):  
Xin Hua Min ◽  
Cheng Jin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
High Temperature ◽  
Room Temperature ◽  
High Strength ◽  
Slow Cooling ◽  
Microstructure And Mechanical Properties ◽  
Ta15 Titanium Alloy ◽  
The Ideal

In this paper,effect of the different forging processes on the microstructure and mechanical properties of the flat flat billets of TA15 titanium alloy was investigated.The flat billiets of 80 mm×150 mm×L sizes of TA15 titanium alloy are produced by four different forging processes.Then the different microstrure and properties of the flat billiets were obtained by heat treatment of 800 °C~850 °C×1 h~4h.The results show that, adopting the first forging temperature at T1 °C、slow cooling and the second forging temperature at T2°C 、quick cooling, the primary αphases content is just 10%, and there are lots of thin aciculate phases on the base. This microstructure has both high strength at room temperature and high temperature, while the properties between the cross and lengthwise directions are just the same. So the hot processing of the first forging temperature at T1 °C、slow cooling and the second forging temperature at T2°C 、quick cooling is choosed as the ideal processing for production of aircraft frame parts.

Microstructure, Phase Composition, Physical and Mechanical Properties of Titanium Alloy VT23 Hot-Extruded Tube

2021 ◽  
Vol 410 ◽  
pp. 324-329
Author(s):  
Fedor V. Vodolazskiy ◽  
Anatoliy G. Illarionov ◽  
Natalya A. Shirinkina
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Phase Composition ◽  
Phase State ◽  
Physical And Mechanical Properties ◽  
Transmission Microscopy ◽  
X Ray ◽  
Structure Phase ◽  
Close Relationship ◽  
Alloy Vt23

Macro-, microstructural, fine structure, phase composition, texture and complex of physical and mechanical properties in titanium alloy VT23 (Ti-5.5Al-4.7V-2.5Mo-1.1Cr-0.7Fe, wt. %) tube were studded by the macroanalysis, optical and transmission microscopy, X-ray phase analysis, durometry and microindentation methods. A close relationship between the structural-textural-phase state formed during the extrusion and the obtained level of strength, plastic, durometric properties and the contact modulus of elasticity in a hot-extruded tube has been established.

Microstructures and Mechanical Properties of Two-Phase FeNiMnAl Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 2549-2554 ◽  
Author(s):  
Ian Baker ◽  
Xiao Lan Wu ◽  
Fan Ling Meng ◽  
Paul R. Munroe
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Temperature Dependence ◽  
Room Temperature ◽  
High Strength ◽  
Two Phase ◽  
Nanostructured Alloys ◽  
Microstructures And Mechanical Properties ◽  
Very High

This paper presents an overview of the microstructures found in a range of two-phase FeNiMnAl alloys ranging from near-equiatomic very high-strength nanostructured alloys, such Fe30Ni20Mn25Al25, to more ductile f.c.c./B2 alloys, such as Fe30Ni20Mn35Al15. The effect of annealing at 823 K on the room temperature hardness is presented together with the temperature dependence of the yield strength.

The influence of heat treatment on the formation of the structure and the level of mechanical properties of high-alloyed titanium alloy

2020 ◽  
pp. 28-41
Author(s):  
I. R. Kozlova ◽  
E. V. Chudakov ◽  
N. V. Tretyakova ◽  
Yu. M. Markova ◽  
E. A. Vasilieva
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Thermal Action ◽  
High Strength ◽  
Heterogeneous Structure ◽  
Two Phase ◽  
Structure Changes ◽  
Hardened State ◽  
Alloyed Titanium

The paper investigates the possibility of increasing the strength of the experimental high-alloyed titanium alloy due to various methods of thermal action, leading to a change in its phase composition and intragrain structure. Changes in mechanical properties in correlation with the change in structure in the annealed, tempered and heat-hardened state are reviewed. It is shown that by controlling phase transformations in highalloyed two-phase titanium alloys, it is possible to realize high-strength state with satisfactory plastic characteristics. The optimal complex of mechanical properties is provided by heat treatment, which leads to the creation of a two-phase heterogeneous structure with a developed bimodal intragrain structure.

Effect of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel

2019 ◽  
Vol 1 (96) ◽  
pp. 22-31
Author(s):  
W. Borek ◽  
A. Lis ◽  
K. Gołombek ◽  
P. Sakiewicz ◽  
K. Piotrowski
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Deformation Rate ◽  
Room Temperature ◽  
Dynamic Conditions ◽  
X Ray ◽  
Type Steel ◽  
Austenitic Structure ◽  
Plastic Deformation Rate ◽  
Static Conditions

Purpose: The aim of the paper is to determine influence of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel tested at room temperature. Design/methodology/approach: Mechanical properties of tested steel was determined using Zwick Z100 static testing machine for testing with the deformation speed equal 0.008 s-1, and RSO rotary hammer for testing with deformation speeds of 250, 500 and 1000s-1. The microstructure evolution samples tested in static and dynamic conditions was determined in metallographic investigations using light microscopy as well as X-ray diffraction. Findings: Based on X-ray phase analysis results, together with observation using metallographic microscope, it was concluded, that the investigated high-Mn X13MnAlSiNbTi25-3-3 steel demonstrates austenitic structure with numerous mechanical twins, what agrees with TWIP effect. It was demonstrated, that raise of plastic deformation rate produces higher tensile strength UTS and higher conventional yield point YS0.2. The UTS strength values for deformation rate 250, 500 and 1000 s-1 grew by: 35, 24 and 31%, appropriately, whereas in case of YS0.2 these were: 7, 74 and 130%, accordingly, in respect to the results for the investigated steel deformed under static conditions, where UTS and YS0.2 values are 1050 MPa and 700 MPa. Opposite tendency was observed for experimentally measured uniform and total relative elongation. Homogeneous austenitic structure was confirmed by X-ray diffractometer tests. Research limitations/implications: To fully describe influence of strain rates on structure and mechanical properties, further investigations specially with using transmission electron microscope are required. Practical implications: Knowledge about obtained microstructures and mechanical properties results of tested X13MnAlSiNbTi25-3-3 steel under static and dynamic conditions can be useful for the appropriate use of this type of engineering material in machines and equipment susceptible to static or dynamic loads. Originality/value: The influence of plastic deformation at room temperature under static and dynamic conditions of new-developed high-manganese austenitic X13MnAlSiNbTi25-3-3 steels were investigated.

scholarly journals Magnetron-Sputtered Ni-Cr and Ti-Si Layers to Protect Ti-46Al-8Nb (at.%) Substrates Against Gas Absorption

2019 ◽  
Vol 28 (10) ◽  
pp. 6258-6267
Author(s):  
Marzena Mitoraj-Królikowska ◽  
Elzbieta Godlewska
Keyword(s):  
Mechanical Properties ◽  
Cross Sections ◽  
Photoelectron Spectroscopy ◽  
Analytical Techniques ◽  
Gas Absorption ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Surface Protection ◽  
X Ray ◽  
Higher Temperature

Abstract Ni-Cr and Ti-Si layers were deposited by magnetron sputtering on Ti-46Al-8Nb (at.%) substrates to suppress penetration of gases, which brings about undesirable changes in mechanical properties. Alloy samples with and without surface protection were subjected to interrupted oxidation at elevated temperature (700 and 800 °C) for up to 300 h. Selected mechanical properties as well as adhesion of surface layers were examined in the as-received and oxidized state. Analytical techniques used to characterize surfaces and cross sections of the samples included scanning electron microscopy and light microscopy, energy-dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy and x-ray diffraction. Both investigated layers were sufficiently adherent and effective in hindering gas absorption at 700 °C; however, only Ni-Cr showed promising properties for higher-temperature applications.

Mechanical Properties of Ultrafine Grained Two-Phase Titanium Alloy Produced by “abc” Deformation

2012 ◽  
Vol 706-709 ◽  
pp. 1859-1863 ◽  
Author(s):  
Sergey V. Zherebtsov ◽  
Sergey Kostjuchenko ◽  
Egor A. Kudryavtsev ◽  
Svetlana Malysheva ◽  
Maria A. Murzinova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Titanium Alloy ◽  
Impact Toughness ◽  
Room Temperature ◽  
Tensile Elongation ◽  
Two Phase ◽  
Ultrafine Grained ◽  
Ultrafine Grained Microstructure ◽  
Room Temperature Strength

The mechanical properties of two-phase Ti-6Al-4V titanium alloy with ultrafine grained microstructure were studied in the present work. Bulk ultrafine grained specimens of the alloy were produced by means of warm “abc” deformation. The final structure consisted of α/β particles with a size of 500 nm. Extensive studies of the mechanical properties of this material in comparison with conventionally heat-strengthened condition were conducted. A room-temperature strength and fatigue resistance of the ultrafine grained material was found to be 25-40% higher than that of heat-strengthened alloy. However such ductility related properties as tensile elongation and impact toughness noticeably decreased with decreasing grain size. Efficacy of ductility improvement and the strength/ductility balance optimization were analyzed.

Internal Oxidation and Mechanical Properties of Pt-IrO2 Thin Films

2003 ◽  
Vol 795 ◽  
Author(s):  
Richard R. Chromik ◽  
Thirumalesh Bannuru ◽  
Richard P. Vinci
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Photoelectron Spectroscopy ◽  
Thermal Cycle ◽  
Room Temperature ◽  
Sputter Deposition ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Difference ◽  
Pt Films

ABSTRACTPt-IrO2 films, approximately 200 nm thick, were fabricated by co-sputter deposition of Pt and Ir in an Ar-O2 mixture followed by annealing at 700°C in O2 for 4 hours. X-ray photoelectron spectroscopy and x-ray diffraction measurements indicate the presence of IrO2 throughout the thickness of the films. After a thermal cycle in vacuum to 700°C, the room temperature residual stress is significantly lower in the internally oxidized films than in pure Pt films of similar thickness subjected to identical cycling. Initial analysis of the behavior of the films during thermal cycling indicates that the primary cause for the difference in residual stress level is a decrease in the thermoelastic slope associated with the introduction of IrO2.

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