scholarly journals FEATURES OF STRUCTURE FORMATION IN EXPLOSION WELDED BIMETAL STEEL 20 + STAINLESS STEEL 50CR15MO2V AFTER LONG HIGH-TEMPERATURE HEATING

2021 ◽  
pp. 12-19
Author(s):  
V. N. Arisova ◽  
A. F. Trudov ◽  
L. M. Gurevich ◽  
A. E. Birshbaeva ◽  
V. O. Kharlamov
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
High Temperature ◽  
Carbon Steel ◽  
Structure Formation ◽  
Explosion Welding ◽  
Joint Zone ◽  
Steel 20 ◽  
Temperature Heating ◽  
High Temperature Heating

The results of studies of the structure in the joint zone of stainless steel 50Cr15Мo2V with carbon steel 20 after explosion welding and subsequent heat treatment at a temperature of 1000 ° C and holding times of 5-20 hours are presented. The formation of a continuous diffusion layer in the joint zone is shown, the thickness of which depends on the holding time.

scholarly journals X-RAY STUDIES OF COMPOSITE MATERIAL STEEL 20 - STAINLESS STEEL 50CR15MO2V AFTER EXPLOSION WELDING AND NORMALIZATION

2021 ◽  
pp. 26-31
Author(s):  
V. N. Arisova ◽  
A. F. Trudov ◽  
A. I. Bogdanov ◽  
A. E. Birshbaeva ◽  
M. A. Razuvaev
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Composite Material ◽  
Fine Structure ◽  
Martensitic Transformation ◽  
Coherent Scattering ◽  
Explosion Welding ◽  
Joint Zone ◽  
X Ray ◽  
Steel 20

The results of studies of the characteristics of the fine structure of a bimetal made of stainless steel 50Kh15M2F and carbon steel 20 after explosion welding and subsequent heat treatment in the joint zone are presented. It was found that normalization at temperatures above 900 ° C leads to a martensitic transformation in steel 50Cr15Мo2V, which is accompanied by an increase in hardness and the development of a fine structure: an increase in the level of elastic deformation of the crystal lattice and fragmentation of coherent scattering regions.

scholarly journals STUDY OF DIFFUSION PROCESSES IN BIMETAL STEEL 20 - STAINLESS STEEL 50Cr15Мo2V AFTER EXPLOSION WELDING AND THERMAL TREATMENT

2020 ◽  
pp. 18-22
Author(s):  
A. F. Trudov ◽  
V. N. Arisova ◽  
L. M. Gurevich ◽  
A. E. Birshbaeva ◽  
V. O. Kharlamov
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Composite Material ◽  
Carbon Steel ◽  
Diffusion Processes ◽  
Low Carbon Steel ◽  
Explosion Welding ◽  
Low Carbon ◽  
Layer Composite ◽  
Steel 20

The results of studying the diffusion of alloying elements of stainless steel 50Cr15Мo2V of a two-layer composite material at the interface with carbon steel 20 after explosion welding and subsequent heat treatment are presented. The absence of significant diffusion of chromium from alloyed to low-carbon steel has been established.

Effect of heat treatment and heat treatment in combination with lignosulfonate on in situ rumen degradability of canola cake crude protein, lysine, and methionine

2020 ◽  
Vol 100 (1) ◽  
pp. 165-174 ◽  
Author(s):  
Piotr Micek ◽  
Katarzyna Słota ◽  
Paweł Górka
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Crude Protein ◽  
Dry Matter ◽  
Increased Temperature ◽  
Heat Treated ◽  
Cold Pressed ◽  
Temperature Heating ◽  
High Temperature Heating

The aim of this study was to determine the effect of heat treatment alone or in combination with the addition of lignosulfonate (LSO3) on canola cake protein, lysine, and methionine degradation in the rumen. Cold-pressed canola cake was left untreated, heated at 90, 110, 130, or 150 °C, or processed with 5% of LSO3 (in dry matter) and then heated. Effective rumen degradability of crude protein (CP), lysine, and methionine was less for treated than untreated canola cake (P < 0.05) and decreased with increased temperature of heating, but particularly when canola cake was heated at 150 °C (quadratic, P < 0.01). In general, effective rumen degradability of CP, lysine, and methionine was less for canola cake heated at 130 °C in combination with LSO3 compared with canola cake heat treated only (quadratic × LSO3 interaction, P ≤ 0.07). Results of this study indicate that high temperature heating (130 °C or greater for 60 min) may be necessary to protect canola cake protein from degradation in the rumen, and the combination of heat treatment and LSO3 may be more effective in protecting canola cake protein, lysine, and methionine from degradation in the rumen than the use of heat treatment only.

scholarly journals Chili and Sweet Pepper Seed Oil Used as a Natural Antioxidant to Improve the Thermo-Oxidative Stability of Sunflower Oil

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2579
Author(s):  
Ileana Cocan ◽  
Monica Negrea ◽  
Antoanela Cozma ◽  
Ersilia Alexa ◽  
Mariana-Atena Poiana ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fatty Acid ◽  
High Temperature ◽  
Lipid Oxidation ◽  
Sunflower Oil ◽  
Seed Oil ◽  
Sweet Pepper ◽  
Temperature Heating ◽  
High Temperature Heating ◽  
Pepper Seed

The main purpose of this work was to assess the potential of chili pepper seed oil (CPSO) and sweet pepper seed oil (SPSO) to inhibit or retard the thermo-oxidative processes undergoing in sunflower oil (SFO) when subjected to high-temperature heating for 4 and 8 h in simulated frying conditions. The effects of high-temperature treatment for 4 and 8 h on the fatty acid composition and the lipid oxidation degree of the investigated oil samples were evaluated using the peroxide value (PV), the p-anisidine value (p-AV) and the thiobarbituric acid test (TBA). All determinations were performed before and after sample heating in order to evaluate the changes in lipid oxidation as well as in the chemical composition. In all studied samples, both after 4 h and 8 h of high-temperature heating, there was an increase of the saturated fatty acid content. This increase is lower in the case of SFO samples supplemented with CPSO and SPSO when compared with SFO. A 41.67% increase was recorded for the SFO sample supplemented with 300 ppm CPSO, and a 36.76% increase was recorded for the SFO supplemented with 300 ppm SPSO, compared to the 44.97% increase recorded for the SFO. Heating the samples supplemented with CPSO and SPSO with a concentration of 300 ppm for 8 h led to the much lower values of the investigated parameters in relation to the control sample, as follows: PV (12.95 ± 0.17 meq/kg oil for SFO + 300 ppm CPSO and 13.45 ± 0.32 meq/kg oil for SFO + 300 ppm SPSO, compared with 16.4 + 0.17 meq/kg oil for SFO), p-AV (63.445 ± 1.259 ppm oil for SFO + 300 ppm CPSO and 64.122 ± 1.208 ppm oil for SFO + 300 ppm SPSO, compared with 72.493 + 1.340 ppm oil for SFO), CD (45%; 30%), TOTOX (88.374 for SFO + 300 ppm CPSO and 101.366 for SFO + 300 ppm SPSO compared with 105.347 ppm for SFO) and TBA (98.92 ± 2.49 µg MDA/g oil for SFO + 300 ppm CPSO and 114.24 ± 3.51 µg MDA/g oil for SFO + 300 ppm SPSO, compared with 180.08 + 5.82 µg MDA/g oil for SFO). Regarding the lipid oxidation process occurring during the heat treatment, we observed the reduction of lipid oxidation by the addition of CPSO and SPSO and recommend these seed oils as potential natural antioxidants in order to improve the oxidative stability of SFO during heat treatment.

scholarly journals STRUCTURE TRANSFORMATION IN THE EXPLOSION WELDED BIMETAL STEEL 20 + STEEL 50Cr15Мo2V AFTER THERMAL TREATMENT

2020 ◽  
pp. 7-12
Author(s):  
A. Trudov ◽  
V. Arisova ◽  
L. Gurevich ◽  
A. Birshbaeva
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Carbon Steel ◽  
Thermal Treatment ◽  
Structural Changes ◽  
Explosion Welding ◽  
Structure Transformation ◽  
Steel 20 ◽  
Increasing Temperature ◽  
Decarburized Layer

The results of studies of structural changes in a two-layer explosion-welded composite material are presented: carbon steel 20 + alloyed stainless steel 50Cr15Мo2V after normalization at temperatures of 800 - 1100 С and holding time 1 hour. It was found that at 800 ° C there is a “reverse” diffusion of carbon - from its lower to higher concentrations and the formation of a decarburized layer in steel 20, and with increasing temperature, carbon diffuses back into steel 20 together with chromium, changing the structure of the heat-affected zone: with an increase in the amount of perlite , the formation of the structure of Widmannstätt and carbide colonies in steel 20 and the formation of martensite in steel 50Cr15Мo2V. The features of structural changes in the alloys that were formed after explosion welding are considered.

scholarly journals OPTIMIZATION OF TEMPERATURE HARDENING FOR IMPROVING THE HEAT RESISTANCE OF TOOL STEEL 4Х5MФ1С IN VARIOUS WORKPIECES. PART 2. THE CHOICE OF THE MODE OF HARDENING STEEL 4Х5MФ1С TO INCREASE THE HARDNESS AND HEAT RESISTANCE AFTER TEMPERING

2017 ◽  
pp. 70-77 ◽  
Author(s):  
V. N. Fedulov
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Heat Resistance ◽  
Primary Phase ◽  
Steel Matrix ◽  
Secondary Phases ◽  
Complete Dissolution ◽  
Temperature Hardening ◽  
Temperature Heating ◽  
High Temperature Heating

A new mode of heat treatment, including oil quenching from temperature 1150 °C with tempering at 500–650 °С for 1,5 hours was developed. The effect of increasing the level of hardening and the heat resistance is determined by more complete dissolution of the steel matrix, the coarsening of grains and morphology of the primary phase of the structure and as a result of high temperature heating and increasing of the number of secondary phases as a result of the tempering. The results of the work could be used in production of working parts is highly resourceful tool for heat forming. 

Modeling the High-Temperature Heating of Scrap Metals

Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 58-63
Author(s):  
Konstantin V. Strogonov ◽  
◽  
Andrey A. Chaymelov ◽  
Keyword(s):  
High Temperature ◽  
Scrap Metals ◽  
Temperature Heating ◽  
High Temperature Heating
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