scholarly journals ASSESSMENT OF THE EFFECT OF CARBON ON PERFORMANCE PROPERTIES AND THE MICROSTRUCTURE OF ROLL STEEL

2021 ◽  
pp. 35-40
Author(s):  
N. A. Feoktistov ◽  
V. P. Chernov ◽  
A. S. Savinov ◽  
D. A. Gorlenko ◽  
I. V. Mikhalkina
Keyword(s):  
Mechanical Properties ◽  
Carbide Phase ◽  
Chemical Elements ◽  
Hypereutectoid Steel ◽  
Roll Steel ◽  
Performance Properties ◽  
Alloy Chemistry ◽  
Research Procedure ◽  
And Performance ◽  
Materials Used

This paper concentrates on studying the effect of carbon on performance properties of 150KhNM roll steel grade. The introduction contains a brief literature review on the effect of the roll alloy chemistry on performance and mechanical properties of mill rolls. Besides, it demonstrates the relevance of the presented studies. The paper describes the effect of chemical elements, such as manganese, niobium, vanadium, nickel on the microstructure and mechanical properties of mill rolls. It also classifies alloying elements by their effect on polymorphic transformation temperatures and shows carbide-forming elements increasing such property. We also considered the effect of the carbide phase on hypereutectoid steel. The paper contains carbide compounds that may be formed in steels, and their classification. It describes the mechanism of the effect of the carbide phase on performance properties of steel castings. The second part of the paper presents a research procedure and briefly describes materials used for the research and laboratory and analytical equipment. The third part of the paper presents the research results. It describes the effect of carbon in a broad range on service durability of hypereutectoid roll steel in conditions of wear at room and elevated (400 ºС) temperatures. Besides, we determined the effect of carbon on the roll alloy microstructure and analyzed relations between the microstructure and performance properties of hypereutectoid roll steel. The conclusion of the paper summarizes the results and contains the references used for an analytical review.

Effect of Elastane Parameters on the Dimensional and Mechanical Properties of Stretchable Denim Fabrics

2020 ◽  
pp. 0887302X2096881
Author(s):  
Muhammad Bilal Qadir ◽  
Zulfiqar Ali ◽  
Ali Afzal ◽  
Muhammad Irfan ◽  
Tanveer Hussain ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Regression Analysis ◽  
Elastic Properties ◽  
Linear Density ◽  
Cotton Yarn ◽  
Performance Properties ◽  
The Core ◽  
Denim Fabric ◽  
And Performance

Denim is one of the most popular casual apparel all over the globe due to a variety of available looks, comfort, and convenience. Comfort and performance properties of stretched denim fabrics depend on the elastane content, which can be controlled through the linear density of elastane and draft-ratio in the core of the cotton yarn. Optimization of both of linear density and draft-ratio of elastane for the better performance of denim fabric were focused upon in this study. The results indicated that the elastane content inside the core of yarn affects the dimensional and mechanical properties of denim fabrics. Regression analysis indicated that elastane linear-density and draft-ratio had an almost equal significance on contraction after washing, stretchability, stiffness, skewness, and bow of fabric. However, the elastic properties of fabric were mainly dependent on the elastane draft-ratio. This study will be an endeavor for industry personnel to achieve more durable and dimensionally stable denim fabrics.

Development of Modeling Algorithm of the Characteristics of the Steels in the Subsystem of Management of the Production Resources of Steel Production

2019 ◽  
Vol 20 (10) ◽  
pp. 615-622
Author(s):  
S. S. Kochkovskaya
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Chemical Composition ◽  
Control Mechanism ◽  
Chemical Elements ◽  
Functional Model ◽  
Steel Production ◽  
Model Management ◽  
Roll Steel ◽  
Software Product

The article is devoted to the development of an algorithm for modeling the characteristics of steels in accordance with customer requirements. A mathematical model is presented that takes into account the optimal levels of the main factors and their interaction, providing the required values of the characteristics. The next step in the study of the mathematical model was modeling by means of functional modeling methodology IDEF0. Input and output data, as well as normative documents of model management and mechanisms of this management for building a functional model are defined. The control mechanism was the software product OptimalSostav, developed using the object-oriented programming language Delphi. The software product is designed to simulate the characteristics of steels using the specified limits of permissible minimum and maximum values of mechanical properties. The algorithm of realization of the control mechanism, which is based on the fractional factor analysis, is described. The presented algorithm allows to identify the influence of chemical composition on the mechanical properties of steels in the form of mathematical and graphical dependencies and to determine the specified mechanical properties that meet the requirements of the customer. The main possibilities and the scope of the software product, which allows to solve the problem of predicting the optimal chemical composition, providing the required mechanical characteristics, as well as to adjust the process of steel melting within a given chemical composition to achieve the desired set of properties. The application of the software product on the example of the analysis of the influence of chemical elements on the mechanical properties of 75HMF roll steel is shown. The results of modeling in the form of mathematical and graphic dependences are given and the estimation of efficiency of application of the software product is given. The results of solving the problem of approximation of the obtained graphic dependences of the influence of chemical elements on the mechanical properties of the studied steel grade by means of Microsoft Excel are presented. It is established that the developed mathematical and algorithmic software of the software product allows to study the percentage of chemical elements in relation to the total composition of the alloy, based on the obtained pie charts and dependency graphs. The adequacy of the model is confirmed by experimental results.

Metallic Nanoneedles Arrays for TEM Sample Preparation “Lift-Out”

2012 ◽  
Author(s):  
Romaneh Jalilian ◽  
David Mudd ◽  
Neil Torrez ◽  
Jose Rivera ◽  
Mehdi M. Yazdanpanah ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Sample Preparation ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Beam System ◽  
Transmission Electron ◽  
Nanoneedle Array ◽  
Superior Mechanical Properties ◽  
And Performance

Abstract The sample preparation for transmission electron microscope can be done using a method known as "lift-out". This paper demonstrates a method of using a silver-gallium nanoneedle array for a quicker sharpening process of tungsten probes with better sample viewing, covering the fabrication steps and performance of needle-tipped probes for lift-out process. First, an array of high aspect ratio silver-gallium nanoneedles was fabricated and coated to improve their conductivity and strength. Then, the nanoneedles were welded to a regular tungsten probe in the focused ion beam system at the desired angle, and used as a sharp probe for lift-out. The paper demonstrates the superior mechanical properties of crystalline silver-gallium metallic nanoneedles. Finally, a weldless lift-out process is described whereby a nano-fork gripper was fabricated by attaching two nanoneedles to a tungsten probe.

Emerging Techniques for the Characterization of Nano-Mechanical Properties of Integrated Circuit Components

2008 ◽  
Author(s):  
Nicholas Randall ◽  
Rahul Premachandran Nair
Keyword(s):  
Mechanical Properties ◽  
Quality Control ◽  
Integrated Circuits ◽  
Integrated Circuit ◽  
Manufacturing Process ◽  
Solder Bumps ◽  
Initial Work ◽  
Circuit Components ◽  
Materials Used

Abstract With the growing complexity of integrated circuits (IC) comes the issue of quality control during the manufacturing process. In order to avoid late realization of design flaws which could be very expensive, the characterization of the mechanical properties of the IC components needs to be carried out in a more efficient and standardized manner. The effects of changes in the manufacturing process and materials used on the functioning and reliability of the final device also need to be addressed. Initial work on accurately determining several key mechanical properties of bonding pads, solder bumps and coatings using a combination of different methods and equipment has been summarized.

scholarly journals Hybrid monomer design for unifying conflicting polymerizability, recyclability, and performance properties

Chem ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 670-685
Author(s):  
Changxia Shi ◽  
Zi-Chen Li ◽  
Lucia Caporaso ◽  
Luigi Cavallo ◽  
Laura Falivene ◽  
...  
Keyword(s):  
Performance Properties ◽  
And Performance

scholarly journals Analysis of the Impact on the Mechanical Properties of Modification of Oligohydroxyethers in Organic Solvent Solution with Rubbers

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 519
Author(s):  
Vitalii Bezgin ◽  
Agata Dudek ◽  
Adam Gnatowski
Keyword(s):  
Mechanical Properties ◽  
Scientific Paper ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Molecular Weights ◽  
Wide Range ◽  
Strength Tests ◽  
Materials Used ◽  
Styrene Butadiene ◽  
The Impact

This paper proposes and presents the chemical modification of linear hydroxyethers (LHE) with different molecular weights (380, 640, and 1830 g/mol) with the addition of three types of rubbers (polysulfide rubber (PSR), polychloroprene rubber (PCR), and styrene-butadiene rubber (SBR)). The main purpose of choosing this type of modification and the materials used was the possibility to use it in industrial settings. The modification process was conducted for a very wide range of modifier additions (rubber) per 100 g LHE. The materials obtained in the study were subjected to strength tests in order to determine the effect of the modification on functional properties. Mechanical properties of the modified materials were improved after the application of the modifier (rubber) to polyhydroxyether (up to certain modifier content). The most favorable changes in the tested materials were registered in the modification of LHE-1830 with PSR. In the case of LHE-380 and LHE-640 modified in cyclohexanol (CH) and chloroform (CF) solutions, an increase in the values of the tested properties was also obtained, but to a lesser extent than for LHE-1830. The largest changes were registered for LHE-1830 with PSR in CH solution: from 12.1 to 15.3 MPa for compressive strength tests, from 0.8 to 1.5 MPa for tensile testing, from 0.8 to 14.7 MPa for shear strength, and from 1% to 6.5% for the maximum elongation. The analysis of the available literature showed that the modification proposed by the authors has not yet been presented in any previous scientific paper.

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