OPTIMIZATION OF COMPOSITION AND APPLICATION SCHEME OF CARBONITRIDING COATING FOR INCREASING THE SURFACE PROPERTIES OF TOOL STEELS
https://doi.org/10.21122/1683-6065-2018-1-144-147
Abstract
The positive effect of using a new coating composition is primarily achieved due to the increase of the applied coating layer thickness to 20 mm on the hardened working surfaces of the tooling and due to introduction of gypsum in its composition. These actions improve the machinability of the coating application and the core formation on the surface of the heated coating of the crust, prevent emission of the gas phase from the reaction zone during heating in the furnace at 520 °C for 4 to 8 hours, as well as the use of strontium fluoride and an increase in the ferrocyanic potassium content. The diffusion capacity of the saturation process increases due to these actions. The use of a new composition, the change in the thickness of the layer, and also the fixation of the temperature regime of heating will ensure an increase in the operation life of the hardened tool parts by 1.5–2 times.
About the Author
V. N. Fedulov
Belarusian National Technical University
Belarus
Minsk, Belarus, 65, Nezavisimosti ave.
Belarus
Minsk, Belarus, 65, Nezavisimosti ave.
References
1. Geller Ju. A. Instrumental’nye stali [Tool steels]. Moscow, Metallurgija Publ., 983, p. 19.
2. Fedulov V. N. Puti povyshenija stojkosti vysokonagruzhennogo instrumenta gorjachej vysadki golovok boltov [Ways to increase the durability of a high-loaded tool for hot disembarkation of bolt heads]. Lit’e i metallurgija = Foundry production and metallurgy, 2016, no. 1, pp. 120–129.
3. Fedulov V. N. Vlijanie uslovij ohlazhdenija i razmera zagotovki pri lit’e instrumental’noj stali na sposobnost’ k posledujushhemu termicheskomu uprochneniju poverhnosti [Influence of the cooling conditions and the size of the workpiece upon casting of tool steel on the ability to subsequently harden the surface]. Lit’e i metallurgija = Foundry production and metallurgy, 2016, no. 3, pp. 117–127.
4. Fedulov V. N. Optimizacija temperaturnogo rezhima zakalki dlja povyshenija teplostojkosti instrumental’noj stali 4H5MF1S v razlichnyh zagotovkah. Chast’ 2. Vybor rezhima zakalki stali 4H5MF1S dlja povyshenija tverdosti i teplostojkosti posle otpuska [Optimization of the temperature regime of quenching for increasing the heat resistance of 4Х5МФ1С tool steel in various blanks. Part 2.Choosing the quenching regime for 4Х5МФ1С steel to increase hardness and heat resistance after tempering]. Lit’e i metallurgija =Foundry production and metallurgy, 2017, no. 3, pp. 70–77.
5. Fedulov V. N. Povyshenie stojkosti press-form dlja lit’ja aljuminievyh splavov v processe jekspluatacii [Increasing the durability of molds for casting aluminum alloys during operation]. Respublikanskij mezhvedomstvennyj sbornik nauchnyh trudov «Metallurgija» [The Republican interdepartmental collection of scientific works «Metallurgy»]. 2013, Vol. 34, pp. 180–187.
Review
For citations:
Fedulov V.N. OPTIMIZATION OF COMPOSITION AND APPLICATION SCHEME OF CARBONITRIDING COATING FOR INCREASING THE SURFACE PROPERTIES OF TOOL STEELS. Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY). 2018;(1):144-147. (In Russ.) https://doi.org/10.21122/1683-6065-2018-1-144-147
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