Effect of plastic deformation, chilling, and aging on the strength characteristics of Kh18N9T steel

1966 ◽  
Vol 8 (11) ◽  
pp. 941-942
Author(s):  
Yu. V. Shakhnazarov
Keyword(s):  
Plastic Deformation ◽  
Strength Characteristics ◽  
Kh18n9t Steel

scholarly journals Влияние структурных факторов на прочность и электропроводность объемных наноструктурных медных сплавов

2019 ◽  
Vol 89 (2) ◽  
pp. 192
Author(s):  
Р.Г. Чембарисова ◽  
И.В. Александров ◽  
А.М. Ямилева
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Electrical Resistance ◽  
Specific Resistance ◽  
Structural Parameters ◽  
High Strength ◽  
Strength Characteristics ◽  
Treatment Conditions ◽  
Modeling Data ◽  
Experimental Values

AbstractThe structural parameters ensuring high strength and low electrical resistance have been analyzed in Cu–Cr alloys exposed to severe plastic deformation (SPD) and aging. Specific resistance and strength characteristics have been modeled for a Cu–0.5 wt % Cr alloy with a nanostructure state caused by SPD. A comparison of modeling data with experimental values reveals the validity of the approach chosen for describing the above states. The formation of nanostructure states with high strength and low electrical resistance is shown to be due to simultaneous effects depending on the treatment conditions of materials.

scholarly journals Development and modeling of a device for strengthening the channels of gun barrels by the method of vibration-centrifugal processing

2019 ◽  
Vol 21 (91) ◽  
pp. 118-123
Author(s):  
V. I. Topchii ◽  
I. S. Aftanasiv ◽  
I. G. Svidrak
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Strength Characteristics ◽  
Surface Plastic ◽  
Surface Layers ◽  
Chemical Action ◽  
Gun Barrel ◽  
Working Surface ◽  
And Performance ◽  
Materials Used

The paper proposes a fundamentally new method of vibration-centrifugal hardening of internal cylindrical surfaces of long-length steel parts, in particular artillery guns, belonging to a group of methods of surface plastic deformation, and is characterized by providing a significant level of energy for deformation of the material being processed. Artillery cannons, along with a system for targeting shooting guns, are perhaps the most responsible component, which not only provides range and accuracy of the aiming shot, but also regulates the durability of the gun in general. During each of the gun shots, the surface layers of the metal of the channel of its trunk are exposed to the destructive effects of high (up to 10000 °C) temperatures, the chemical action of powder gases, excessive pressures and mechanical wear on the movement of the shell. This leads to the destruction of the structure, strength and density of the metal surface layers, its burning and wear, which in the rest, leads to violations of the geometry of the working surface of the trunk channel. Violation of the geometry of the working surface of the channel of the gun barrel negatively affects the range, and most importantly, the precision of gunfire and other precision related tactical and technical characteristics of gun armament. Excessively worn internal working surface of the canal of the trunk of repair and restoration is practically not subject. This determines the availability of such characteristics for cannon weaponry as the permissible number of gunfire shots, which to a certain extent limits the duration of the effective use of guns. A rather common practice in mechanical engineering is that when the strength characteristics and capabilities of the materials used are practically exhausted, designers and developers draw their views on the technological capabilities to improve the operational properties of parts and units. Not the last position in their list is the reinforcing operations of the surface layers of the material of the details by various methods of surface plastic deformation, widely known in the literary primary sources under the acronym “PPE methods”. The common advantage of the best of a fairly wide variety of varieties (rolling, rolling, smoothing, blasting and vibrating processing, etc.) is that, without substituting the part for energy-intensive high-temperature heating, the strength characteristics and performance properties of the most loaded surface layers of the material of parts are improved. Accordingly, the use in manufacturing processes of the details of PPD methods helps to increase their reliability and longevity. The developed design of the reinforcement on the basis of the proposed method of vibration-centrifugal hardening treatment is used to strengthen the internal cylindrical channels of the trunk of large-caliber artillery cannons. The reinforcement is simple in structure, energy-saving, does not provide for the maintenance of highly skilled service personnel. The solid-state model of the device for the vibration-centrifugal hardening of the internal cylindrical surfaces of steel parts has been created

INVESTIGATIONS ON BALLISTIC METHOD APPLICATION FOR SELF-STRENGTHENING 35 MM GUN BARRELS

2017 ◽  
pp. 55-68
Author(s):  
Tomasz SATŁAWSKI ◽  
Wojciech Furmanek
Keyword(s):  
Plastic Deformation ◽  
Service Life ◽  
Technological Process ◽  
Wall Thickness ◽  
High Strength ◽  
Strength Characteristics ◽  
Strengthening Effect ◽  
Local Character ◽  
Numerical Studies ◽  
Ballistic Method

The paper includes an analysis of a concept for increasing the service life of 35 mm gun barrels by technological process of self-strengthening. A process of barrel self-strengthening that uses a ballistic method based on technological firings with special ammunition of increased propelling charge is considered. In effect of analytical - numerical studies it was stated that a self-strengthening effect is strictly limited to the cartridge chamber and has a local character i.e. the plastic deformation of barrel’s material includes not more than 30% of barrel wall thickness. The received results indicate that efficiency of self-strengthening provided by the ballistic method is low and in cases of deploying materials with high strength characteristics in barrels it could not bring any benefits at all.

Microstructure and High Temperature Strength Characteristics of Unidirectionally Solidified Al2 O3 /GdAlO3 Eutectic Composite

2006 ◽  
Vol 317-318 ◽  
pp. 437-440 ◽  
Author(s):  
Hideki Ohtsubo ◽  
Narihito Nakagawa ◽  
Kazutoshi Shimizu ◽  
Koji Shibata ◽  
Atsuyuki Mitani ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Temperature Gradient ◽  
Flexural Strength ◽  
Mechanical Strength ◽  
Unidirectional Solidification ◽  
Strength Characteristics ◽  
High Temperature Strength ◽  
Flexural Test ◽  
Eutectic Composite

Enploying unidirectional solidification, Al2O3/GdAlO3(Gadolinium Aluminum Perovskite:GAP) eutectic composite was fabricated. The Al2O3/GAP eutectic composite obtained has a flexural strength of over 600Mpa above 1500C. The composite also showed plastic deformation above 1550C on the flexural test. The effect of microstructure on mechanical strength at high temperature was investigated. Al2O3/GAP eutectic composites having different microstructure were fabricated by controlling the temperature gradient on unidirectional solidification. It was found that the flexural strength at high temperature of the composite became higher with refining the microstructure.

Effect of shear strain on increase of strength and plastic properties of products made of refractory powder materials

2020 ◽  
pp. 454-461
Author(s):  
S.M. Vaytsekhovich ◽  
Yu.V. Vlasov ◽  
A.Yu. Zhuravlev
Keyword(s):  
Plastic Deformation ◽  
Shear Strain ◽  
Shear Deformation ◽  
Strength Characteristics ◽  
Powder Materials ◽  
Workpiece Material ◽  
Refractory Powder ◽  
Plastic Properties ◽  
Porous Bodies ◽  
Modern Development

The analysis of modern development of plastic deformation methods of powdered materials, porous bodies and powders is carried out. The technology for obtaining of heavy-loaded parts from hard-to-form powder materials is considered. It is shown that repeated shear deformation increases the uniformity, equalizes the structure increases the strength characteristics of the deformable workpiece material and has little effect on the level of plastic properties.

Sem Examinations of Glass Knives

1970 ◽  
Vol 28 ◽  
pp. 282-283
Author(s):  
J. Temple Black
Keyword(s):  
Plastic Deformation ◽  
Tensile Loading ◽  
Resultant Force ◽  
Stress Concentrations ◽  
Edge Chipping ◽  
Surface Flaws ◽  
Edge Defects ◽  
Microscopic Surface

There are two types of edge defects common to glass knives as typically prepared for microtomy purposes: 1) striations and 2) edge chipping. The former is a function of the free breaking process while edge chipping results from usage or bumping of the edge. Because glass has no well defined planes in its structure, it should be highly resistant to plastic deformation of any sort, including tensile loading. In practice, prevention of microscopic surface flaws is impossible. The surface flaws produce stress concentrations so that tensile strengths in glass are typically 10-20 kpsi and vary only slightly with composition. If glass can be kept in compression, wherein failure is literally unknown (1), it will remain intact for long periods of time. Forces acting on the tool in microtomy produce a resultant force that acts to keep the edge in compression.

Stereo Electron Microscopy Applied to High Resolution Freeze-Etch Replicas

1970 ◽  
Vol 28 ◽  
pp. 306-307
Author(s):  
L. Andrew Staehelin
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
High Resolution ◽  
Smooth Surfaces ◽  
Small Particles ◽  
Membrane Surfaces ◽  
Wide Acceptance ◽  
New Information ◽  
Number Of Particles ◽  
Small Holes

Freeze-etched membranes usually appear as relatively smooth surfaces covered with numerous small particles and a few small holes (Fig. 1). In 1966 Branton (1“) suggested that these surfaces represent split inner mem¬brane faces and not true external membrane surfaces. His theory has now gained wide acceptance partly due to new information obtained from double replicas of freeze-cleaved specimens (2,3) and from freeze-etch experi¬ments with surface labeled membranes (4). While theses studies have fur¬ther substantiated the basic idea of membrane splitting and have shown clearly which membrane faces are complementary to each other, they have left the question open, why the replicated membrane faces usually exhibit con¬siderably fewer holes than particles. According to Branton's theory the number of holes should on the average equal the number of particles. The absence of these holes can be explained in either of two ways: a) it is possible that no holes are formed during the cleaving process e.g. due to plastic deformation (5); b) holes may arise during the cleaving process but remain undetected because of inadequate replication and microscope techniques.

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