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Title:Mehanizem hitre tvorbe bainita pri nizkih temperaturah : doktorska disertacija
Authors:ID Kirbiš, Peter (Author)
ID Brunčko, Mihael (Mentor) More about this mentor... New window
Files:.pdf Doktorat_V11_SVN_Koncna.pdf (8,84 MB)
MD5: 5959D0783D2BE9B2F0744B45E4FBA00D
 
Language:Slovenian
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Abstract:V okviru doktorske disertacije je bil razvit nov postopek hitre tvorbe bainita v jeklih ter posledično nova skupina bainitnih jekel, ki imajo izjemno hitro kinetiko tvorbe bainita pri nizkih temperaturah, običajno pod 250°C. Za ta jekla je značilen razvoj izjemno fine bainitne mikrostrukture med kontinuirnim ohlajanjem/kaljenjem iz temperature avstenitizacije, ne da bi pri tem potrebovali izotermne toplotne obdelave. Udarna žilavost in druge mehanske lastnosti ostajajo v skladu z najpogostejšimi zahtevami glede žilavosti in standardnimi specifikacijami, hkrati pa ohranjajo zadostno prekaljivost za zagotovitev homogenih lastnosti znotraj velikih presekov. Ta jekla imajo visoko trdoto do 65HRC in majhno geometrijsko popačenje oz. distorzijo med toplotno obdelavo. Zaradi teh lastnosti so novo razvita jekla še posebej primerna za izdelavo orodij za delo v hladnem, nožev, balistične zaščite ter strojnih delov visoke trdnosti. Ključna značilnost teh jekel je tvorba bainitnih nukleusov pri visoki temperaturi in hitra rast bainitnega ferita pri nizki temperaturi. To je v nasprotju z običajnimi oz. splošno poznanimi jekli in železovimi zlitinami, znotraj katerih se ta dva koraka izvajata sočasno. Metoda, s katero smo to dosegli, se je poimenovala kinetična aktivacija bainita -KAB in skupine zlitin KAB jekla.
Keywords:Jeklo, Bainit v jeklih, nanostrukturni bainit, mehanizmi utrjanja, kinetika tvorbe bainita
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[P. Kirbiš]
Year of publishing:2022
Number of pages:XI, 104 str.
PID:20.500.12556/DKUM-82585 New window
UDC:669.15-194.591:669.148(043.3)
COBISS.SI-ID:155271683 New window
Publication date in DKUM:08.06.2023
Views:740
Downloads:89
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:25.08.2022

Secondary language

Language:English
Title:Mechanism of rapid bainite formation at low temperatures
Abstract:A novel procedure for the obtainment of rapid bainite formation within steels was developed. Consequently the new group of steel grades exhitis very rapid bainite formation at low temperatures, commonly below 250°C. These steels develop a very fine bainitic microstructure during continuous cooling/quenching from the austenitization temperature, without the need for isothermal heat treatments. Impact toughness and other mechanical properties meanwhile remain in compliance with common standard specifications, while also retaining sufficient hardenability to ensure homogeneous properties throughout thick sections. These steels develop a hardness of up to 65HRC and a low distortion during heat treatment. This combination of mechanical properties makes such steels particularly suitable for the production of tools, rolls, knives, ballistic protection and machine parts requiring high strength. The major trait in these steels is the formation of bainite nuclei at high temperatures and the subsequent growth of bainitic ferrite at lower temperatures. Tis is in contrast with contemporary data on standardized steels where these two process are thought to occur simultaneously. The method by which this is achieved is termed Kinetically activated bainite KAB, and the group of alloys KAB steels.
Keywords:steel, bainite in steels, nanostructured bainite, strengthening mechanisms, bainite formation kinetics


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