Titre du document / Document title
Microstructural characterization of rapidly solidified ultrahigh boron tool steels
Auteur(s) / Author(s)
JIMENEZ J. A. (1) ;
ADEVA P. (1) ;
FROMMEYER G. ;
RUANO O. A. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) CSIC, cent. nacional investigaciones metalúrgicas, 28040 Madrid, ESPAGNE
Résumé / Abstract
Argon atomized powders of two modified boron-containing-tool steels in the rapid solidification condition as well as the consolidated materials after hot isostatic pressing at different temperatures were investigated. The microstructure of the powders of both tool steels consists of primary dendrites of solidification and a network of the M
23(B,C)
6 borocarbide forming a continuous phase. The metastable M
3B boride is present because of the high solidification rates involved in the atomization process. This microstructure is gradually lost when the temperature of consolidation by hot isostatic pressing is increased. A fine and uniform microstructure is developed after consolidation at 1100 °C. An increase of hardness with an increase of consolidation temperature is observed which is associated to the presence of martensite since both alloys have a composition characteristic of air-hardening steels. After two consecutive tempering treatments at 650°C for 2h the martensite is decomposed and a decrease of hardness with increasing consolidation temperature is observed.
Revue / Journal Title
Zeitschrift für Metallkunde
ISSN
0044-3093
CODEN ZEMTAE
Source / Source
1995, vol. 86, n
o10, pp. 693-699 (14 ref.)
Langue / Language
Anglais
Revue : Allemand
Editeur / Publisher
Hanser, München, ALLEMAGNE
(1948-2006)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 271, 35400005894036.0060
Nº notice refdoc (ud4) : 2902691
