The Effect of Grain Size of Steel R6M5 on the Diffusion Rate and Growth Kinetics of the Hardened Layer After Ion Nitriding in a Glow Discharge

2020 ◽  
Author(s):  
Aleksandr Asylbaev ◽  
Larisa Shaikhutdinova ◽  
Ruslan Vafin ◽  
Kamil' Ramazanov ◽  
Ernst Khairetdinov
Keyword(s):  
Grain Size ◽  
Glow Discharge ◽  
Growth Kinetics ◽  
Diffusion Rate ◽  
Hardened Layer ◽  
Steel R6m5 ◽  
Ion Nitriding ◽  
Kinetics Of

scholarly journals Influence of hydrogen content in working gas on growth kinetics of hardened layer at ion nitriding of steels

2018 ◽  
Vol 1115 ◽  
pp. 032034
Author(s):  
Yu G Khusainov ◽  
K N Ramazanov ◽  
R D Agzamov ◽  
I V Zolotov ◽  
R S Esipov
Keyword(s):  
Growth Kinetics ◽  
Hydrogen Content ◽  
Hardened Layer ◽  
Ion Nitriding ◽  
Kinetics Of

Experiments and modeling study on growth behavior of Cr-nitrides formed on electroplated hard Cr during ion-nitriding

2003 ◽  
Vol 18 (4) ◽  
pp. 861-867 ◽  
Author(s):  
J. Y. Eom ◽  
V. Shankar Rao ◽  
H. S. Kwon ◽  
K. S. Nam ◽  
S. C. Kwon
Keyword(s):  
Growth Kinetics ◽  
Diffusion Constant ◽  
Nitride Layer ◽  
Growth Behavior ◽  
Computer Simulation Model ◽  
Nitrogen Diffusion ◽  
Nitriding Temperature ◽  
Ion Nitriding ◽  
Nitride Layers ◽  
Kinetics Of

The structure and composition of Cr-nitrides formed on an electroplated hard Cr layer during an ion-nitriding process were analyzed, and its growth kinetics was examined as a function of the ion-nitriding temperature and time to establish a computer simulation model for the prediction of growth behavior of the Cr-nitride layer. The Cr-nitrides formed during the ion-nitriding at 550–770 °C were composed of outer CrN and inner Cr2N layers. A nitrogen diffusion model in the multilayer, based on fixed-grid finite difference method, was applied to simulate the growth kinetics of Cr-nitride layers. By measuring the thickness of Cr-nitride layers as a function of ion-nitriding temperature and time, the activation energy (Q) and nitrogen diffusion constant (Do) were determined for growth of CrN and Cr2N; the result was applied to simulate the growth kinetics of Cr-nitride layers, and reasonable good agreement was obtained with the experimental results.

Controlling the Microstructure of the 2223 Phase Grains for the Fabrication of Silver Clad (Bi,Pb)2Sr2Ca2Cu3Ox Tapes Through the Growth Kinetics of the Superconducting Phases

1992 ◽  
Vol 275 ◽  
Author(s):  
Wai Lo ◽  
B. A. Glowacki
Keyword(s):  
Growth Rate ◽  
Grain Size ◽  
Liquid Phase ◽  
Bulk Density ◽  
Growth Kinetics ◽  
Major Phase ◽  
Average Grain Size ◽  
The Relationship ◽  
Kinetics Of ◽  
Fast Growth Rate

ABSTRACTOur study concentrated on the relationship between the proportions of the phases in the precursors used to synthesise the Bi-2223 phase and the ultimate microstructures of the 2223 phase materials, although the overall cation stoichiometry fixed. It was found that the final 2223 phase grains were larger, although the bulk density tended to be lower with the grains loosely packed together, when the major phase in the precursor was 2212 phase. This was proved to be partly caused by the fast growth rate of the 2212 phase grains which were eventually converted into the 2223 phase. When 2223 phase was present in the precursor, the bulk density became higher and 2223 phase grains became closely packed together, although the average grain size became smaller. This was explained by the existence of a liquid phase at higher temperatures during the formation of the 2223 phase and the sintering of the 2223 phase grains.

scholarly journals Effect of ion nitriding by glow discharge on the physical and mechanical properties of the plastically deformed tool steel R6M5

2021 ◽  
Vol 2064 (1) ◽  
pp. 012052
Author(s):  
R K Vafin ◽  
A V Asylbaev ◽  
D V Mamontov ◽  
I D Sklizkov ◽  
G I Raab ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Glow Discharge ◽  
Tool Steel ◽  
Physical And Mechanical Properties ◽  
Coarse Grained ◽  
Steel R6m5 ◽  
Ion Nitriding ◽  
Fine Grained ◽  
Fine Grained Structure

Abstract This work is devoted to the study of the effect of the duration of ion nitriding by glow discharge on the physical and mechanical properties of tool steel with different initial structure. We used specimens of R6M5 tool steel with a coarse-grained structure obtained after annealing at a temperature of 850°C and with a fine-grained structure obtained after severe plastic deformation by torsion discharge. With an increase in the duration of ion nitriding, the thickness of the hardened layer and wear resistance increase. The combination of plastic deformation with ion nitriding by glow discharge increases the adsorption and diffusion rate of the saturating element due to the creation of a highly fragmented and disoriented fine-grained structure and contributed to reduction in processing time.

scholarly journals Перспективы развития процессов химико-термического упрочнения легированных сталей (обзорная информация)

2021 ◽  
Vol 70 (2) ◽  
pp. 78-85
Author(s):  
А.П. Прохоров ◽  
А.А. Баранова
Keyword(s):  
Phase Composition ◽  
Glow Discharge ◽  
Hardened Layer ◽  
Nitriding Process ◽  
Ion Nitriding ◽  
Steel Type ◽  
Structure Phase ◽  
Modified Layer

The paper summarizes the results of studies of the structure, phase composition and operational properties of gears made of steel type 38Kh2MYuA, which are observed in the modified layer, after the nitriding process. Much attention is paid to the process of ion nitriding in a glow discharge. The study of the hardened layer showed that there are some differences depending on the temperature of the process. Frequently used methods for the protection of non-aerated surfaces are considered.

Grain Growth Kinetics of (NdPr)2Fe14B Magnets

2014 ◽  
Vol 802 ◽  
pp. 540-545 ◽  
Author(s):  
Kaio Sérgio Torres de Souza ◽  
Célio de Jesus Marcelo ◽  
Daniel Rodrigues ◽  
José Adilson de Castro ◽  
Marcos Flavio de Campos
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Growth Kinetics ◽  
Energy Product ◽  
Heat Treated ◽  
Coarsening Kinetics ◽  
Grain Growth Kinetics ◽  
Kinetics Of

Two different effects need to be considered in the sintering: (i) The densification should be maximum, to optimize the energy product BHmax and the remanence, however, (ii) the .grain size should be small, in order to maximize the coercivity. Grain growth takes place during the sintering step of the magnets, usually performed at the range 1000-1100°C. In this study, the grain growth kinetics is investigated. Samples of NdPrFeB magnets (proportion 3 Nd : 1 Pr) were heat treated at the temperature of 1050 °C, for times between 1 to 12 hours. The knowledge of the grain growth and coarsening kinetics allows extrapolation to other temperatures, and this information is helpful to maximize coercivity and remanence at the same time.

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