Controlled thermogasocyclic nitriding processes
The existing basic nitriding methods do not exploit many of the potential opportunities. To intensify it and increase its efficiency, this paper considers and proposes a new method of low-temperature nitriding, which makes it possible to optimise the classical process and reduce the consumption of a...
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| Format: | Article |
| Language: | English |
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National Institute for Aerospace Research “Elie Carafoli” - INCAS
2021-08-01
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| Series: | INCAS Bulletin |
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| Online Access: | https://bulletin.incas.ro/files/belashova__all__vol_13_special_issue.pdf |
| _version_ | 1819145215852675072 |
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| author | Irina S. BELASHOVA Peter S. BIBIKOV Alexander A. OREKHOV Eduard I. STAROVOITOV |
| author_facet | Irina S. BELASHOVA Peter S. BIBIKOV Alexander A. OREKHOV Eduard I. STAROVOITOV |
| author_sort | Irina S. BELASHOVA |
| collection | DOAJ |
| description | The existing basic nitriding methods do not exploit many of the potential opportunities. To intensify it and increase its efficiency, this paper considers and proposes a new method of low-temperature nitriding, which makes it possible to optimise the classical process and reduce the consumption of ammonia from 2 to 10 times, reduce the nitriding time by 4-6.5 times with an increase in the thickness of the diffusion layer by 2-6 times without reducing the physical and mechanical properties. During the experiment, gas-cyclic and thermogasocyclic nitriding of armco iron was carried out on an experimental setup, which included a system for monitoring and maintaining the temperature in the working volume, a gas supply system, monitoring the flow rate and degree of ammonia dissociation, cleaning and drying gas, as well as two electromagnetic gas valves controlled from the control panel, allowing the processes to be carried out automatically. As a result, a new method of low-temperature nitriding has been developed – under the conditions of a thermo-gas cycle. This method consists in periodic alternation of saturation cycles during flow nitriding and resorption of the nitrided layer with the maximum possible decrease in the saturating capacity of the atmosphere. The proposed new method of thermogasocyclic nitriding is a new, effective hardening technology that allows to reduce the consumption of saturating gas and emissions into the atmosphere by up to 10 times, the nitriding time by 4-6.5 times, and also to increase the thickness of the diffusion layer by 2-6 times without reducing the physical and mechanical properties. A new technological parameter has been established – the duration of half-cycles, which allows simply and effectively regulating the phase composition and structure of the layer in order to obtain the required physical and mechanical properties. |
| first_indexed | 2024-12-22T12:54:30Z |
| format | Article |
| id | doaj.art-f7a94a3db1e146169ce3edcfa7698522 |
| institution | Directory Open Access Journal |
| issn | 2066-8201 2247-4528 |
| language | English |
| last_indexed | 2024-12-22T12:54:30Z |
| publishDate | 2021-08-01 |
| publisher | National Institute for Aerospace Research “Elie Carafoli” - INCAS |
| record_format | Article |
| series | INCAS Bulletin |
| spelling | doaj.art-f7a94a3db1e146169ce3edcfa76985222022-12-21T18:25:09ZengNational Institute for Aerospace Research “Elie Carafoli” - INCASINCAS Bulletin2066-82012247-45282021-08-0113S132010.13111/2066-8201.2021.13.S.2Controlled thermogasocyclic nitriding processesIrina S. BELASHOVA0Peter S. BIBIKOV1Alexander A. OREKHOV2Eduard I. STAROVOITOV3Department of Advanced Materials and Technologies, Moscow Aviation Institute (National Research University), 4 Volokolamskoe Shosse, 125993, Moscow, Russian Federation, belashova5924-2@uoel.ukDepartment of Advanced Materials and Technologies, Moscow Aviation Institute (National Research University), 4 Volokolamskoe Shosse, 125993, Moscow, Russian Federation, bibikov5924-2@kpi.com.deInstitute of General Engineering Education, Moscow Aviation Institute (National Research University), 4 Volokolamskoe Shosse, 125993, Moscow, Russian Federation, lsk.orekhov@gmail.comDepartment of Building Mechanics, Belarusian State University of Transport, 246653, 34 Kirov Str., Gomel, Republic of Belarus, edstar0@yandex.byThe existing basic nitriding methods do not exploit many of the potential opportunities. To intensify it and increase its efficiency, this paper considers and proposes a new method of low-temperature nitriding, which makes it possible to optimise the classical process and reduce the consumption of ammonia from 2 to 10 times, reduce the nitriding time by 4-6.5 times with an increase in the thickness of the diffusion layer by 2-6 times without reducing the physical and mechanical properties. During the experiment, gas-cyclic and thermogasocyclic nitriding of armco iron was carried out on an experimental setup, which included a system for monitoring and maintaining the temperature in the working volume, a gas supply system, monitoring the flow rate and degree of ammonia dissociation, cleaning and drying gas, as well as two electromagnetic gas valves controlled from the control panel, allowing the processes to be carried out automatically. As a result, a new method of low-temperature nitriding has been developed – under the conditions of a thermo-gas cycle. This method consists in periodic alternation of saturation cycles during flow nitriding and resorption of the nitrided layer with the maximum possible decrease in the saturating capacity of the atmosphere. The proposed new method of thermogasocyclic nitriding is a new, effective hardening technology that allows to reduce the consumption of saturating gas and emissions into the atmosphere by up to 10 times, the nitriding time by 4-6.5 times, and also to increase the thickness of the diffusion layer by 2-6 times without reducing the physical and mechanical properties. A new technological parameter has been established – the duration of half-cycles, which allows simply and effectively regulating the phase composition and structure of the layer in order to obtain the required physical and mechanical properties.https://bulletin.incas.ro/files/belashova__all__vol_13_special_issue.pdfnitridingthermo-gas cyclesduration of the half-cyclessaturationdenitriding |
| spellingShingle | Irina S. BELASHOVA Peter S. BIBIKOV Alexander A. OREKHOV Eduard I. STAROVOITOV Controlled thermogasocyclic nitriding processes INCAS Bulletin nitriding thermo-gas cycles duration of the half-cycles saturation denitriding |
| title | Controlled thermogasocyclic nitriding processes |
| title_full | Controlled thermogasocyclic nitriding processes |
| title_fullStr | Controlled thermogasocyclic nitriding processes |
| title_full_unstemmed | Controlled thermogasocyclic nitriding processes |
| title_short | Controlled thermogasocyclic nitriding processes |
| title_sort | controlled thermogasocyclic nitriding processes |
| topic | nitriding thermo-gas cycles duration of the half-cycles saturation denitriding |
| url | https://bulletin.incas.ro/files/belashova__all__vol_13_special_issue.pdf |
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