Comprehensive analysis of fractures, microstructure, and physical and mechanical properties for the evaluation of the crack resistance of medium-carbon Cr–Ni–Mo steel

2017 ◽  
Vol 118 (10) ◽  
pp. 1015-1021 ◽  
Author(s):  
R. A. Vorob’ev ◽  
V. N. Dubinskii ◽  
V. V. Evstifeeva
Keyword(s):  
Mechanical Properties ◽  
Crack Resistance ◽  
Physical And Mechanical Properties ◽  
Comprehensive Analysis ◽  
Medium Carbon

scholarly journals Development of a new metal alloy based on palladium within the framework of practical implementation of the concept of development of the domestic dental materials science

2017 ◽  
Vol 21 (1) ◽  
pp. 7-10
Author(s):  
Vitaliy Anatol’evich Parunov ◽  
M. A Kareva ◽  
D. S Tykochinskiy ◽  
I. Yu Lebedenko
Keyword(s):  
Mechanical Properties ◽  
Materials Science ◽  
Linear Expansion ◽  
Dental Materials ◽  
Physical And Mechanical Properties ◽  
Comprehensive Analysis ◽  
Practical Implementation ◽  
Palladium Alloys ◽  
Dental Prostheses ◽  
Metal Ceramic

The article shows the creation of the new Russian alloy based on palladium for metal-ceramic dental prostheses "Palladini UNI puteam comprehensive analysis of the influence of alloying elements on the phase structure of the palladium alloys, physical and mechanical properties and coefficient of thermal linear expansion.

Effect of complex deoxidizing upon physical and mechanical properties of medium carbon steel

1966 ◽  
Vol 1 (5) ◽  
pp. 390-392
Author(s):  
Yu. A. Shul'te ◽  
I. P. Volchok ◽  
V. V. Lunev ◽  
V. P. Rudenko
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Physical And Mechanical Properties ◽  
Medium Carbon Steel ◽  
Medium Carbon

Influence of Structural Characteristics on Concrete Strength under Dynamic Effects

2019 ◽  
Vol 968 ◽  
pp. 368-379
Author(s):  
Andrii A. Plugin ◽  
Olena Palant ◽  
Dmytro Plugin ◽  
Sergii Miroshnichenko
Keyword(s):  
Mechanical Properties ◽  
Crack Resistance ◽  
Structural Characteristics ◽  
Concrete Strength ◽  
Physical And Mechanical Properties ◽  
Dynamic Effects ◽  
Cement Ratio ◽  
Fine Aggregates ◽  
Water To Cement Ratio ◽  
Optimal Values

The article deals with theoretical and experimental research into dependency of crack resistance of concrete under dynamic effects on coefficients of grain separation of coarse and fine aggregates. It was established that these dependencies were of extreme nature. The research yielded the optimal values of coefficients of grain separation of coarse and fine aggregates, cement particles, and also water-to-cement ratio for the materials under study; these factors provided the best physical and mechanical properties of concrete, including its crack resistance under dynamic effects, both impacts and vibrations..

scholarly journals Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide

2021 ◽  
Vol 5 (12(113)) ◽  
pp. 6-19
Author(s):  
Edwin Gevorkyan ◽  
Volodymyr Nerubatskyi ◽  
Volodymyr Chyshkala ◽  
Oksana Morozova
Keyword(s):  
Mechanical Properties ◽  
Crack Resistance ◽  
Electric Current ◽  
Zirconium Dioxide ◽  
Physical And Mechanical Properties ◽  
Ammonia Solution ◽  
Sintering Process ◽  
Simultaneous Inhibition ◽  
Fluoride Salts ◽  
Sintering Method

Peculiarities of formation of microstructure in composites based on chemically synthesized zirconium nanopowders obtained by the method of decomposition from fluoride salts were considered. Hydrofluoric acid, concentrated nitric acid, aqueous ammonia solution, metallic zirconium, and polyvinyl alcohol were used. It was established that the reduction of porosity in nanopowders in the sintering process is the main problem in the formation of high-density materials. Analysis of various initial nanopowders, their morphology, and features of sintering by the method of hot pressing with direct transmission of electric current was made. Peculiarities of obtaining the composites based on them with the addition of Al2O3 nanopowders applying the electric sintering method were considered. It was shown that the increase in the content of alumina nano additives leads to an increase in strength and crack resistance of the samples due to simultaneous inhibition of abnormal grain growth and formation of a finer structure with a high content of tetragonal phase. The influence of sintering modes on the formation of the microstructure of zirconium nanopowders has been studied for different contents of alumina additives. Electric current promotes the surface activity of nanopowders and its variable value promotes partial fragmentation of agglomerated grains thus affecting the composite structure. Physical-mechanical properties of the obtained samples, optimal compositions of mixtures, and possibilities of improving some parameters were determined. It was found that nanopowders of zirconium dioxide obtained by the method of decomposition from fluoride salts are quite suitable for the production of composite materials with high physical and mechanical properties. They can compete with imported analogs and enable obtaining of crack resistance of 7.8 MPa·m1/2 and strength of 820 MPa.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

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