Model Description of the Modified Solid State Plasma Material for Electromagnetic Radiation Protection

This research is related to fabricate Fe-25Ni-17Cr austenitic stainless steel. Methodology: Fe-25Ni-17Cr austenitic stainless steel were made by spark plasma sintering at 900 and 950 o C for 5 minutes. Results: The microstructure of both the steels sintered at 900 and 950°C consists of particles with high Cr content, a'-Cr and austenite matrix containing of fine grains of g-FeNi.Sintering at high temperatures causes the fine grains to be seen more clearly. The fine grains of g-FeNi are twin grains that contain defects such as dislocations, stacking faults and trapped air bubbles. The defects are formed during the mixing process through milling and compacting under a 30 MPa load during the sintering process. The density of the first two defects decreased with increasing the sintering temperature. By contrast, more trapped air bubbles were noticed as increasing the sintering temperature and the distribution of fine a'-Fe particles higher. Since beside of higher the density of steel sintered at the high temperature, smaller grain size of austenite matrix and higher distribution of fine a'-Fe in the austenite matrix, the hardness of this steel is greater than the steel sintered at temperature of 900 o C. Applications/Originality/Value: This study fabricated austenitic stainless steel made from powders of 58% Fe, 25% Ni and 17% Cr. The manufacturing process is carried out through a sintering by spark plasma at temperatures of 900 and 950C for 5 minutes. The microstructure of austenitic stainless steel that formed very well at 950C consisted of very fine grains of austenite g-FeNi and a'-Fe particles were distributed throughout the g-FeNi grains, resulting in a high hardness of 399.3 HV 0.2 .

“…Further reading on related research in different applications such as [21], [22] and [23] can improve the integration of the research.…”

Section: Discussionmentioning

confidence: 99%

Effect of Spark Plasma Sintering (SPS) at Temperatures of 900 and 950oc for 5 Minutes on Microstructural Formation of Fe-25Ni-17Cr Austenitic Stainless Steel

Dani¹

2020

“…Measurements (1) are fed to a recurrent filter that implements the smoothing operation in accordance with the expressions [4,[16][17][18][20][21][22]:…”

Section: Taking Into Account the Correlated Errors Of Measurements When Estimating Parameters Of Object Trajectory At Mechanical Movementmentioning

confidence: 99%

Taking into account the Correlated Errors of Measurements when Estimating Parameters of Object Trajectory at Mechanical Movement

2020

“…The study shows that the temperatures at which phase and structural transformations occur in alloys of the Fe -Fe3C system are called critical points and have symbols. All critical points are indicated by the letter A (from French arrest -stop).A1-pearlite (eutectoid) transformation (A C1during heating, Ar1-during cooling) corresponds to line PSK of the iron -carbon diagram; A3-the beginning of ferrite precipitation from austenite during cooling (Ar3), the end of ferrite dissolution during heating (A C3 ), corresponds to line GS of the iron -carbon diagram; A4transition of  -iron to  -iron during heating (A C1 ) and back when cooling (Ar1); Acm -the beginning of cementite precipitation from austenite during cooling or the end of cementite dissolution during heating, corresponds to line E of the iron -carbon diagram [2,8]. In the process of slow heating in furnaces during quenching or annealing, when the temperature, designated tAc1, (for carbon steels 727 0 C) is reached, the phase transformation of pearlite into austenite occurs: P (Ph + C) A…”

Section: Researchmentioning

confidence: 99%

“…During chemical-heat treatment, both thermal and chemical affect the material, which changes the chemical composition and structure in the surface layers of parts to a certain depth. To change the chemical composition of the surface layers, parts are placed in an active medium: gas, liquid, solid, from which a layer with a changed chemical composition and structure is formed as a result of atom adsorption of the saturable element by the surface of the part and further diffusion of the adsorbed atoms from the surface to a certain distance into the product [8]. The purpose of cementation is to create a high surface hardness with a viscous core.…”

Section: 7martensite (M)mentioning

confidence: 99%

Steel microstructure after thermal and chemo-thermal reprocessing of steel

O.T¹

2020

Various researchers have long studied heat treatment of steel. In the process of mechanical engineering, machine parts are formed by heat. The article deals with a brief summary of the thermal and chemo-thermal reprocessing of steel. The range of heating temperatures during annealing and quenching is determined. The structure of steel and its properties are considered. The research characteristic of all stages of chemo-thermal reprocessing of steel is carried out. Steel microstructure in the process of heat treatment of metal is studied.