Effect of preliminary heat treatment on the properties of the nitrided case on aluminum-free structural steels

1980 ◽  
Vol 22 (6) ◽  
pp. 390-392
Author(s):  
I. B. Rodicheva
Keyword(s):  
Heat Treatment ◽  
Structural Steels ◽  
Preliminary Heat Treatment ◽  
Nitrided Case

Improving Strength of Structural Steels by Preheating in an Oxygen-Containing Medium

2019 ◽  
Vol 946 ◽  
pp. 58-62
Author(s):  
Vladimir Afanasyef ◽  
Marina Popova ◽  
Irina Zhibinova
Keyword(s):  
Heat Treatment ◽  
Structural Steels ◽  
Glass Mass ◽  
Preliminary Heat Treatment ◽  
Final Heat Treatment ◽  
High Oxygen Content ◽  
Granular Pearlite ◽  
Austenite Grain ◽  
Rapid Formation ◽  
Strength And Plasticity

The results of the preliminary heat treatment effecting in a medium with a high oxygen content on the microstructure and mechanical properties of structural steels are presented. It is shown that the usage of preheating in the glass mass in the range of (Ac130°C) – Ac1for steels of grades 50 and 40H leads to the formation of a structure with dispersed granular pearlite and crushed excess ferrite precipitates. Such a structure, when heated for quenching, provides rapid formation of a homogeneous austenite and a delay in the growth of austenite grain, which provides the best combination of strength and plasticity after the final heat treatment. It is established that the tensile strength increases 1.2-1.3 times while maintaining the plasticity characteristics. The reliability of the obtained estimates of the mechanical property characteristics is confirmed by the results of a statistical analysis.

Substantiation into Parameters of Carbon Fuel Production Technology from Brown Coal

2021 ◽  
Vol 1045 ◽  
pp. 90-101
Author(s):  
Oleksandr Shustov ◽  
Artem Pavlychenko ◽  
Andrii Bondarenko ◽  
Oleksandr Bielov ◽  
Olena Borysovska ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Brown Coal ◽  
Vacuum Drying ◽  
Preliminary Heat Treatment ◽  
Fuel Production ◽  
Thermal Coal ◽  
Heat Treated ◽  
Thermal Influence ◽  
Coking Products ◽  
Qualitative And Quantitative Characteristics

Technological solutions for brown coal processing, thermal influence on it at temperature change, thermo vacuum drying are analysed and qualitative and quantitative characteristics of semi – coking products are studied. The parameters of crushing and thermo vacuum drying of brown coal, heat treatment and cascade separation (electrostatic and magnetic) are substantiated. Studies on the manufacture of a pilot batch of carbon fuel with high quality characteristics are performed. Cascade treatment of heat-treated brown coal on electric and magnetic separators allowed to obtain a concentrate with ash content from 17.72 to 22.8%, volatile yield ≤ 35%, higher heat of combustion from 7256.1 to 7523.6 kcal/kg. It is determined that favourable modes of preliminary heat treatment of brown coal samples are in the temperature range of 200-400°С. The established characteristics of the obtained solid fuel correspond to the gas group of thermal coal. The obtained technological solutions for the processing of brown coal can be the basis for the manufacture of an industrial line, taking into account the thermo vacuum installation for further implementation in enterprises using carbon fuel.

scholarly journals RESEARCH OF THE PROCESS OF EXTRACTION OF BLACK CUMIN OIL WITH PRELIMINARY HEAT TREATMENT

2021 ◽  
pp. 66-69
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Acid Number ◽  
Oil Yield ◽  
Preliminary Heat Treatment ◽  
Heat Treatment Process ◽  
Drying Process ◽  
Technological Parameters ◽  
Variable Parameters ◽  
Black Cumin

The aim of the study is to increase the yield of oil from black cumin seeds. The results of studies of the influence of technological parameters - temperature and duration of drying of black cumin seeds on indicators of the yield of oil, cake and moisture removal from seeds are presented. The optimal technological parameters of the influence of the preliminary heat treatment process on the indicators of the maximum oil yield, acid number, color, and oil moisture have been established. The variable parameters were the temperature from 80 to 130 °C and the duration of the heat treatment process from 5 to 60 minutes. The possibility of increasing the oil yield by 6,11% has been shown. For this, the drying process must be carried out at a temperature of 100 °C and a process duration of 15 minutes. At the same time, the degree of oil extraction increases from 59,13% to 75,24%, the acid number decreases to 2,98, humidity to 0,12%, and color to 40.

Effect of Preliminary Heat Treatment on the Stability of Austenite in Steel 08Kh15N5D2T

2005 ◽  
Vol 47 (5-6) ◽  
pp. 232-234
Author(s):  
T. M. Makhneva ◽  
S. F. Savchenkova ◽  
E. S. Makhnev ◽  
M. V. Savchenkova
Keyword(s):  
Heat Treatment ◽  
Preliminary Heat Treatment ◽  
The Stability

Structure and hardness of the alloy Zn-15%Al depending on the degree of plastic deformation and type of preliminary heat treatment

2018 ◽  
pp. 256-261
Author(s):  
Alexander Ivanovich Scvortsov ◽  
◽  
Yaroslav Dmitrievich Vedernikov ◽  
Anastasiya Vladimirovna Sergeeva ◽  
Anna Alexandrovna Slyudova ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Preliminary Heat Treatment

Influence of Preliminary Heat Treatment and Ball Milling of Aluminum Powder on Cold Spray Process

2021 ◽  
Vol 313 ◽  
pp. 127-135
Author(s):  
S.V. Klinkov ◽  
V.F. Kosarev ◽  
A.E. Chesnokov ◽  
A.V. Smirnov ◽  
V.S. Shikalov
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
Aluminum Powder ◽  
Cold Spraying ◽  
Preliminary Heat Treatment ◽  
Aluminum Powders ◽  
Aluminum Coatings ◽  
Spray Process ◽  
Spraying Process ◽  
Milled Powders

This paper presents the results of a study of the effect of preliminary heat treatment and ball milling of aluminum powder on the cold spraying process and the properties of the obtained coatings (porosity and microhardness). The ball milling of aluminum powder leads to an increase in specific surface area, a decrease in apparent density and a decrease in the value of the crystallite size, which indicates a decrease in grain size. It is shown that coatings deposited from ball milled powders have slightly higher coatings hardness averagely. The profilometry of aluminum coatings obtained under the same conditions from the initial and processed powders did not reveal significant changes in the form of coatings and their typical dimensions (width, thickness), which indicates the absence of significant changes in the deposition coefficient of the initial and processed aluminum powders. Ball milled powders on average correspond to slightly higher hardnesses of coatings.

Preliminary heat treatment of high-speed steel R6M5

1979 ◽  
Vol 21 (3) ◽  
pp. 161-163
Author(s):  
A. N. Popandopulo ◽  
S. Yu. Kondrat'ev ◽  
G. Yu. Novikova ◽  
A. A. Smirnov
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
Preliminary Heat Treatment ◽  
Steel R6m5
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