scholarly journals The effect of radial-shear rolling on microstructure and mechanical properties of stainless austenitic steel AISI-321

2018 ◽  
Vol 190 ◽  
pp. 11003 ◽  
Author(s):  
Abdrakhman Naizabekov ◽  
Sergey Lezhnev ◽  
Alexandr Arbuz ◽  
Evgeniy Panin
Keyword(s):  
Mechanical Properties ◽  
Austenitic Steel ◽  
Strength Properties ◽  
Grain Structure ◽  
Microstructure And Mechanical Properties ◽  
Ultrafine Grained ◽  
Steel Aisi ◽  
Aisi 321 ◽  
Radial Shear Rolling ◽  
Stainless Austenitic Steel

Improving the quality of metal products by crushing of the microstructure of material is one of the promising areas of modern metallurgy. The basic idea consists in refinement the grain structure of the material to sizes less than a micron, i.e. the obtaining of ultrafine-grained (UFG) materials, offering higher strength properties of the material under preservation or a small loss of ductility. Stainless austenitic steel AISI 321 is widely used in all the above areas as well as in chemical, vacuum and nuclear technology. For the obtaining of UFG structure in this material the method of radial-shear rolling is used. For the purpose of identifying the influence of radial-shear rolling on microstructure and mechanical properties of stainless austenitic steel AISI-321, the experiment was conducted where at the radial-shear rolling mill SVP-08 at 800 °C in several passes of the workpieces with a diameter of 30 mm rolled till a diameter of 13 mm with following cooling in water. The analysis of the microstructure of deformed samples showed the presence of equiaxed ultrafine-grained structure in the peripheral areas of the workpiece and the presence of elongated fibrous texture in the axial zone. The strength characteristics of the workpiece has increased more than 2 times, with a slight decrease of plasticity.

Microstructure and Mechanical Properties of the Stainless Steels Obtained by Sintering Mixtures of AISI 316L and Silicon Powders

2006 ◽  
Vol 513 ◽  
pp. 35-50
Author(s):  
K. Sikorski ◽  
Agnieszka Szymańska ◽  
M. Sekuła ◽  
D. Kowalczyk ◽  
Jan Kazior ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Austenitic Steel ◽  
Stainless Steels ◽  
Hydrogen Atmosphere ◽  
Aisi 316L ◽  
Microstructure And Mechanical Properties ◽  
Steel Aisi

The aim of the study was to obtain a ferritic-austenitic stainless steel through sintering of the mixture of austenitic steel AISI 316L powders with silicon in the amount ranging from 1 to 7%. The pressed mixtures were sintered at 1240oC for 60 minutes under hydrogen atmosphere. The results of the silicon admixture on the density, porosity, microstructure and mechanical properties of the sintered specimens are discussed.

Impact of radial-shear rolling on the microstructure and mechanical properties of 08Х18Н10Т stainless austenitic steel

2020 ◽  
Vol 76 (2) ◽  
pp. 162-168
Author(s):  
A. B. Naizabekov ◽  
S. N. Lezhnev ◽  
E. A. Panin ◽  
A. S. Arbuz
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Austenitic Steel ◽  
Ultrafine Grain ◽  
Simultaneous Increase ◽  
Surface Zone ◽  
Gradient Structure ◽  
Fine Grained ◽  
Radial Shear Rolling ◽  
Stainless Austenitic Steel

Grinding of a structural material microstructure to an ultrafine grain state is a way to increase the strength of it. Intensive plastic deformation is the most perspective method of obtaining ultrafine grain materials. However, with the simultaneous increase in strength properties in ultrafine materials, there is an inevitable decrease in its plastic properties; they are becoming fragile and subject to failure during elongation. The use of metal materials with a gradient structure, having course grain size in the central part of the billet and decreasing to ultrafine grain size at the surface, is an effective way to solve the problem of increasing the plasticity of the metal products in general. Possibilities of forming an ultra-fine grained gradient structure in 08X18N10T stainless austenitic steel by using radial-shear rolling studied. The results of the research showed that the ultra-fine grained structure in the radial-shear rolling rod formed on the mill extends from its surface to a depth of at least a quarter of the radius of the rod. The transition zone is in the region between 0.5R and 0.25R of the bar section. Due to the structural heterogeneity of the cross-section of the bar, there is a smooth drop in the micro-hardness from the surface zone of the bar to its central zone by 10.2 %. All this testifies to the gradient character of the structure formed in the bars of 08X18N10T steel during shaping by radial-shear rolling. Studies of the mechanical properties of the deformed bars of 08X18N10T stainless austenitic steel showed that they monotonously change depending on the number of passes. After 7 passes the strength increased almost 2 times to a value of 1073 MPa, and the elongation, which is one of the indicators of the plasticity of the material, was also reduced by 2 times, reaching 21% from the original value of 40%. The results showed a possibility to obtain the gradient structure with increased level of mechanical properties by radial-shear rolling of long billets of 08Х18Н10Т austenitic stainless steel.

The Effect of Radial-Shear Rolling on the Microstructure and Mechanical Properties of Technical Titanium

2020 ◽  
Vol 299 ◽  
pp. 565-570
Author(s):  
A. B. Naizabekov ◽  
Sergey N. Lezhnev ◽  
Alexandr S. Arbuz
Keyword(s):  
Mechanical Properties ◽  
Pure Titanium ◽  
High Strength ◽  
Grain Structure ◽  
Work Piece ◽  
Ultrafine Grained ◽  
Alloying Additives ◽  
Peripheral Areas ◽  
Radial Shear Rolling

Improving the quality of hardware through the improvement of the microstructure is one of the main trends of modern metallurgy. This approach allows us to achieve special properties without the expense of expensive alloying additives. The basic idea is to grind the grain structure of the material to a size less than 1 μm. At the specified grain sizes, the hardening properties begin to manifest with a relatively small loss of plasticity. In this case, one can speak of ultrafine-grained (UFG) materials. This direction is especially important for areas of science and technology, where there are very strict requirements for the size and weight of parts with their high strength. These are aerospace engineering and medicine (implantology and orthopedics). Therefore, it makes sense to conduct research primarily on relevant materials. Titanium is known for its biological inertness, therefore it is the basis for prosthetics. In this work, the experiments on technically pure titanium using a technology close to industrial implementation, were performed. An experiment, in which a lengthy number billet at a temperature of 500 °C rolled from a diameter of 30 mm to a diameter of 15 mm in the mill SVP-08, was conducted. After that, the billet was cooled with water, and samples for studying the microstructure and samples for studying the mechanical properties, were prepared. Analysis of the microstructure showed the presence of an equiaxial ultrafine-grained structure in the peripheral areas of the work-piece and the presence of an elongated fibrous texture in the axial zone. The strength of the work-piece has increased by more than 1.5 times, while the plasticity has decreased not so much.

scholarly journals Superior Strength of Austenitic Steel Produced by Combined Equal-Channel Angular Pressing and Rolling Processing

2016 ◽  
Author(s):  
Marina V. Karavaeva ◽  
Marina M. Abramova ◽  
Nariman A. Enikeev ◽  
Georgy I. Raab ◽  
Ruslan Z. Valiev
Keyword(s):  
Austenitic Steel ◽  
Equal Channel Angular Pressing ◽  
Strength Properties ◽  
Austenitic Steels ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Steel Analysis ◽  
Small Content ◽  
Deformation Treatment ◽  
Stainless Austenitic Steel

Enhancement in the strength of austenitic steels with a small content of carbon can be achieved by a limited number of methods, among which is the ultrafine-grained (UFG) structure formation, especially efficient with the use of severe plastic deformation (SPD) processing that enables increasing significantly the contribution of grain-boundary strengthening, and also involves a combination of other strengthening factors (work hardening, twins, etc.). In this paper, we demonstrate that the use of SPD processing combined with conventional methods of deformation treatment of metals, such as rolling, may lead to an additional strengthening of UFG steel. Analysis of the results of the study on the change of the microstructure and mechanical properties of the Cr-Ni stainless austenitic steel after a combined deformation reveals a substantial increase in the strength properties of this steel, resulting from a consecutive application of SPD processing via equal-channel angular pressing and rolling at a temperature of 400 С, yielding a strength more than 1.5 times higher that that produced by any of these two methods used separately.

Effect of Prolonged Thermal Exposure on Microstructure and Mechanical Properties of Zr – 1 wt.% Nb and Ti – 45 wt.% Nb Ultrafine-Grained Bioinert Alloys

2021 ◽  
Vol 63 (11) ◽  
pp. 1846-1853
Author(s):  
A. Yu. Eroshenko ◽  
Yu. P. Sharkeev ◽  
M. A. Khimich ◽  
P. V. Uvarkin ◽  
A. I. Tolmachev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Exposure ◽  
Microstructure And Mechanical Properties ◽  
Ultrafine Grained

The Effect of Aging Heat Treatment on the Microstructure and Mechanical Properties of 10Cr20Ni25Mo1.5NbN Austenitic Steel

2016 ◽  
Vol 35 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Zhiyuan Liang ◽  
Wanhua Sha ◽  
Qinxin Zhao ◽  
Chongbin Wang ◽  
Jianyong Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Austenitic Steel ◽  
Treatment Time ◽  
Aging Treatment ◽  
Secondary Phases ◽  
Aging Heat Treatment ◽  
Microstructure And Mechanical Properties ◽  
The Impact

AbstractThe effect of aging heat treatment on the microstructure and mechanical properties of 10Cr20Ni25Mo1.5NbN austenitic steel was investigated in this article. The microstructure was characterized by scanning electron microscopy, energy dispersive spectrometry and transmission electron microscopy. Results show that the microstructure of 10Cr20Ni25Mo1.5NbN austenitic is composed of austenite. This steel was strengthened by precipitates of secondary phases that were mainly M23C6 carbides and NbCrN nitrides. As aging treatment time increased, the tensile strength first rose (0–3,000 h) and then fell (3,000–5,000 h) due to the decrease of high density of dislocations. The impact absorbed energy decreased sharply, causing the sulfides to precipitate at the grain boundary. Therefore, the content of sulfur should be strictly controlled in the steelmaking process.

Grain Refinement and Deformation Behavior of Ultrafine Grained Pd and Pd-Ag Alloys Produced by HPT

2008 ◽  
Vol 584-586 ◽  
pp. 182-187
Author(s):  
Lilia Kurmanaeva ◽  
Yulia Ivanisenko ◽  
J. Markmann ◽  
Ruslan Valiev ◽  
Hans Jorg Fecht
Keyword(s):  
Mechanical Properties ◽  
Deformation Behavior ◽  
Materials Science ◽  
High Pressure Torsion ◽  
Uniform Elongation ◽  
Grain Structure ◽  
Coarse Grained ◽  
Ultrafine Grain ◽  
Ultrafine Grained ◽  
Ultrafine Grain Structure

Investigations of mechanical properties of nanocrystalline (nc) materials are still in interest of materials science, because they offer wide application as structural materials thanks to their outstanding mechanical properties. NC materials demonstrate superior hardness and strength as compared with their coarse grained counterparts, but very often they possess a limited ductility or show low uniform elongation due to poor strain hardening ability. Here, we present the results of investigation of the microstructure and mechanical properties of nc Pd and Pd-x%Ag (x=20, 60) alloys. The initially coarse grained Pd-x% Ag samples were processed by high pressure torsion, which resulted in formation of homogenous ultrafine grain structure. The increase of Ag contents led to the decrease of the resulted grain size and change in deformation behavior, because of decreasing of stacking fault energy (SFE). The samples with larger Ag contents demonstrated the higher values of hardness, yield stress and ultimate stress. Remarkably the uniform elongation had also increased with increase of strength.

Microstructure and mechanical properties of ultrafine-grained hardmetals

2001 ◽  
Vol 19 (4-6) ◽  
pp. 553-559 ◽  
Author(s):  
T. Sailer ◽  
M. Herr ◽  
H.-G. Sockel ◽  
R. Schulte ◽  
H. Feld ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Ultrafine Grained
Sign in / Sign up

Export Citation Format

Share Document