Influence of Thermal Treatment on Microstructure and Hardness of Niobium Alloyed PM-Tool Steel

This work describes carbides present in the tool steel containing 2.5% C, 3.3% Si, 6.2% Cr, 2.2% Mo, 2.6% V, 2.6% Nb, 1.0% W, prepared by the powder metallurgy (PM) process. The influence of thermal treatment conditions on carbide behavior is investigated. During austenitization, some dissolution of...

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Bibliographic Details
Published in:Instrumentation science & technology 2004-12, Vol.32 (2), p.207-219
Main Authors: Pavlíčková, Markéta, Vojtech, Dalibor, Novák, Pavel, Gemperlová, Juliana, Gemperle, Antonín, Zárubová, Niva, Jurči, Peter, Lejček, Pavel
Format: Article
Language:English
Subjects:
Carbides
Powder metallurgy process
Thermal treatment
Tool steel
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Summary:This work describes carbides present in the tool steel containing 2.5% C, 3.3% Si, 6.2% Cr, 2.2% Mo, 2.6% V, 2.6% Nb, 1.0% W, prepared by the powder metallurgy (PM) process. The influence of thermal treatment conditions on carbide behavior is investigated. During austenitization, some dissolution of M 7 C 3 occurs, while MC carbides are thermally stable. So, the quenched steel is composed of two types of carbides: chromium rich M 7 C 3 and niobium rich MC, besides martensite and retained austenite. During tempering of the hardened steel at the temperatures above 480°C, the precipitation of very fine carbides and martensite recovery occur, which results in secondary hardening. Precipitated particles are predominantly vanadium and molybdenum rich MC, M 2 C, and M 6 C carbides.
ISSN:1073-9149
1525-6030
DOI:10.1081/CI-120028773