Structure and properties of cast, forged, and sintered R8F8K7M6 high-speed steels

1976 ◽  
Vol 15 (11) ◽  
pp. 868-873
Author(s):  
A. N. Popandopulo ◽  
L. N. Gerashchenko
Keyword(s):  
High Speed ◽  
Structure And Properties

scholarly journals High speed friction welding of titanium alloys — structure and properties of joints

2018 ◽  
Vol 2018 (6) ◽  
pp. 47-50
Author(s):  
D. Miara ◽  
◽  
J. Matusiak ◽  
A. Pietras ◽  
M. Krystian ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Friction Welding ◽  
High Speed ◽  
Structure And Properties

scholarly journals Improving Properties of Tool Steels by Method of Dynamic Alloying

2019 ◽  
Vol 18 (5) ◽  
pp. 369-379
Author(s):  
A. S. Kalinichenko ◽  
V. I. Ovchinnikov ◽  
S. M. Usherenko ◽  
Javad F. Yazdani-Cherati
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Matrix Material ◽  
Amorphous State ◽  
High Speed Steel ◽  
Deep Penetration ◽  
Structure And Properties ◽  
Tool Steels ◽  
Particle Flows ◽  
Dynamic Processing

The influence of high-speed particle fluxes on changes in the structure and properties of materials has been widely studied currently. The effect exerted by particles moving at very high speeds can have both negative (in spacecrafts) and positive character (dynamic processing of tool steels). Therefore a task for studying an effect of high-speed particle flows on structure change in tool steels and improving their performance properties has been set in the paper. The study has used an explosive method for creation of a high-speed flow of SiC + Ni and Al2O3 particles. Samples after dynamic alloying have been subjected to diffusion nitriding. Microstructure of specimens made of X12M, R18, R6M5K5steel has been studied using optical and electron metallography. Wear resistance of the samples has been also tested on a friction machine. Theoretical and experimental results on a complex effect of high-speed microparticle flows and nitriding on a structure and properties of tool steels have been obtained during the research. It has been established that dynamic alloying by particles leads to formation of a specific structure in a composite material reinforced with channels. Central fiber (channel) zone with powder particles residues is surrounded by areas of amorphous state which is succeeded by a zone with a nanocrystalline fragmented cellular structure. Then we observe a zone with a microcrystalline structure that transits to a zone with crystalline structure which is characteristic for a matrix material of structural steel. The obtained data can expand and complement some ideas about mechanisms for dynamic loading of solids and condensed matter, plastic deformation, physical mechanics of structurally inhomogeneous media at different levels, a number of effects arising from collision and ultra-deep penetration of microparticles into metals. It has been shown that wear resistance of high-speed steel subjected to dynamic alloying in the quenched state is increased by 1.2 times in comparison with wear resistance of steel alloyed in the annealing state.

scholarly journals 3D printing technologies for creating models and nozzles in an aerodynamic shock tunnel experiment

2021 ◽  
Vol 2103 (1) ◽  
pp. 012033
Author(s):  
M A Kotov ◽  
N A Monakhov ◽  
S A Poniaev ◽  
P A Popov ◽  
K V Tverdokhlebov
Keyword(s):  
3D Printing ◽  
High Speed ◽  
Additive Technologies ◽  
Structure And Properties ◽  
Dynamic Experiment ◽  
Advantages And Disadvantages ◽  
Nozzle Block ◽  
Rapid Prototyping And Manufacturing ◽  
Manufacturing Techniques ◽  
Traditional Manufacturing

Abstract The features of 3D printing method for rapid prototyping and manufacturing of models for a pulsed high-speed gas-dynamic experiment are considered. Modern additive technologies allow the production of models. The basic properties of the materials and the advantages of 3D printing methods are described. The structure and properties of the obtained models can be unattainable using traditional manufacturing techniques. The design of the wind tunnel nozzle block is considered, which provides for the production of profiled contours using 3D printing. The advantages and disadvantages of use of such units on the shock tube are considered.

scholarly journals A Study of the Airflow and Fiber Dynamics in the Transport Chamber of a Sifting Air-laying System: Part 1

2000 ◽  
Vol os-9 (2) ◽  
pp. 1558925000OS-90
Author(s):  
A. Pourmohammadi ◽  
S.J. Russell ◽  
R. Brandean ◽  
D.B. Ingham ◽  
X. Wen
Keyword(s):  
Laser Doppler Velocimetry ◽  
High Speed ◽  
Structure And Properties ◽  
Air Velocity ◽  
Airflow Velocity ◽  
Short Fibres ◽  
System Part ◽  
Fiber Dynamics ◽  
Structural Architecture ◽  
The Web

The structural architecture of air-laid webs produced from short fibres is largely dependent on the manner in which fibres are assembled together during the web formation process. An improved understanding of the behaviour of fibres during air-laying is essential to provide a basis for more effective engineering of the structure and properties of resulting fabrics. This two part paper presents the results of a preliminary experimental study of the airflow and the fibre dynamics in a sifting air-laying process using LDV and high-speed photographic techniques. In Part 1 of the paper the airflow characteristics are investigated using Laser Doppler Velocimetry. In a commercially representative sifting air-laying machine it was established that the air velocity varies along the length and the height of the transport chamber. The variation is markedly increased by the rotation of the blades in the dispersing zone. Generally, the air velocity was found to increase from the top to the bottom of the transport chamber. With the rotating blades in operation the trend in the airflow velocity was characterised by a ‘V’ shaped profile along the length of the chamber and was independent of the height of the chamber. (Part 2 of this paper will appear in the Fall, 2000 issue of the International Nonwovens Journal.)

Structure and properties of welded blanks for tools of new high-speed steels

1976 ◽  
Vol 18 (11) ◽  
pp. 947-951
Author(s):  
A. N. Dobrovidov ◽  
Yu. A. Evtyushkin ◽  
V. I. Egorov ◽  
A. M. Korikov ◽  
A. I. Cherkasskii
Keyword(s):  
High Speed ◽  
Structure And Properties

Research of Effect of the Powder Material Quality in the Structure Formation of the DLD Inconel 718 Samples

2019 ◽  
Vol 822 ◽  
pp. 404-409
Author(s):  
S.S. Silchonok ◽  
G.G. Zadykyan ◽  
Oleg G. Zotov ◽  
Iuliia N. Morozova
Keyword(s):  
Chemical Composition ◽  
Nickel Alloy ◽  
Structure Formation ◽  
Powder Material ◽  
Inconel 718 ◽  
High Speed ◽  
Laser Deposition ◽  
Structure And Properties ◽  
Direct Laser ◽  
Deposition Technology

This article is devoted to Inconel 718 heat-resistant nickel alloy. Comparison of samples obtained by high-speed direct laser deposition technology of powders from different manufacturers on their structure and properties was carried out. The dependence of the influence of the chemical composition of the powders on the formation of defects in the studied samples was established

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