Influence of heat treatment on the high-temperature oxidation behaviour of chromium-molybdenum-vanadium alloyed hot-work tool steel

Tilen Balaško (Author), Maja Vončina (Author), Jaka Burja (Author), Jože Medved (Author)

Abstract

The high-temperature oxidation behaviour of chromium-molybdenum-vanadium alloyed hot-work tool steel was investigated. High-temperature oxidation was investigated in two conditions: soft annealed, and quenched and tempered. The samples were oxidised in a chamber furnace and in an instrument for simultaneous thermal analysis, for 100 h in the temperature range be- tween 400 °C and 700 °C. Metallographic analysis (optical and scanning electron microscopy) was performed to study the microstructural changes in the steel and the oxide layer. Oxidation kinetics were analysed by thermogravimetric analysis, and equations were derived from the results. The kinetics can be described by three mathematical functions, namely: exponential, parabolic and cubic. However, which function best describes the kinetics depends on the oxidation temperature and the thermal condition of the steel. Quenched and tempered samples were shown to oxidise less, resulting in a slower oxidation rate.

Keywords

heat treatment;tool steel;oxidation;thermogravimetric analysis;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
UDC:	669.15:539.4.016:621.785
COBISS:	104890883
ISSN:	1580-2949
Views:	1186
Downloads:	95
Average score:	0 (0 votes)
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Other data

Secondary language:	Slovenian
Secondary title:	Vpliv toplotne obdelave na visoko temperaturno oksidacijo krom-molibden-vanadij orodnega jekla za delo v vročem
Secondary abstract:	Izvedena je bila raziskava visokotemperaturne oksidacije krom-molibden-vanadijevega orodnega jekla za delo v vročem. Raziskave visokotemperaturne oksidacije so bile opravljene na vzorcih jekla v mehko žarjenem stanju in na vzorcih v poboljšanem stanju. Oksidacija vzorcev je potekala 100 ur v komorni peči in v STA (simultana termična analiza) napravi v temperaturnem območju med 400 °C in 700 °C. Identifikacija mikrostrukturnih sprememb v vzorcih in oksidne plasti je bila izvedena z metalografsko analizo (optična in vrstična elektronska mikroskopija). Kinetika oksidacije je bila opazovana s termo-gravimetrično analizo. Iz rezultatov preizkusov so bile izpeljane matematične enačbe za opis visokotemperaturne oksidacijske kinetike. Kinetika se lahko opiše s tremi matematičnimi funkcijami eksponentno, parabolično in kubično. Katera funkcija pa najbolje opisuje kinetiko, je odvisno od temperature oksidacije in toplotnega stanja jekla. Dokazano je, da poboljšani vzorci manj oksidirajo, kar ima za posledico počasnejšo hitrost oksidacije.
Secondary keywords:	toplotna obdelava;orodno jeklo;oksidacija;termo-gravimetrična analiza;
Type (COBISS):	Article
Pages:	str. 233-241
Volume:	ǂLetn. ǂ56
Issue:	ǂšt. ǂ2
Chronology:	mar.-apr. 2022
DOI:	10.17222/mit.2022.406
ID:	15899369