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.

scholarly journals Gas-Dynamic Specifications of Glow Discharge During Ion Nitriding Process

2018 ◽  
Vol 17 (5) ◽  
pp. 368-377
Author(s):  
M. N. Bosyakov ◽  
A. A. Kozlov
Keyword(s):  
Glow Discharge ◽  
Flow Rate ◽  
Current Density ◽  
Discharge Current ◽  
Surface Hardening ◽  
Nitriding Process ◽  
Vacuum System ◽  
Ion Nitriding ◽  
Discharge Current Density ◽  
Gas Dynamic

Ion-plasma nitriding in glow discharge is a widely used method of surface hardening in the industrialized countries of the world and it is the most modern and technological type of surface hardening of machine parts, molds, dies and cutting tools. However there is no detailed review in the literature of technical characteristics and operation of a gas-vacuum part in ion nitriding units and it does not allow estimating electric power consumption for operation of a gas-vacuum system while assessing efficiency of the given equipment. The paper considers problems pertaining to relationship of gas-dynamic parameters of the nitriding process (pressure and gas flow rate) and energy characteristics of the glow discharge (current density, discharge voltage) during ion nitriding at industrial plants and their impact on the process. Calculation-practical modeling of a vacuum system for an ion nitriding installation shows that it is advisable to use vacuum units which represent consistently connected forevacuum and two-rotor pumps in order to ensure independent control of a pumping speed and flow rate of the gas mixture. Such approach makes it possible to carry out nitriding processes in a wide range of pressures with the possibility to provide high plasma gas rates at a low pressure, in particular, when processing large areas. The paper has revealed temperature interrelations, chamber pressure and glow discharge current density that ensure its existence in the abnormal form. It has been shown that at lower operational pressure during the process, higher degree of discharge abnormality can be provided at uniform temperature of the batch. Due to this it is possible to attain higher temperature similarity which ensures uniformity of a nitrided layer on all parts of the batch.

Structure, Phase Composition, and Mechanical Properties of a Boron-Containing High-Nitrogen Austenitic Steel Made by Induction Melting

2020 ◽  
Vol 2020 (12) ◽  
pp. 1439-1445
Author(s):  
I. O. Bannykh ◽  
O. A. Bannykh ◽  
L. G. Rigina ◽  
E. N. Blinova ◽  
K. Yu. Demin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Austenitic Steel ◽  
Induction Melting ◽  
High Nitrogen ◽  
Structure Phase
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