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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 M23(B,C)6 borocarbide forming a continuous phase. The metastable M3B 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, no10, pp. 693-699 (14 ref.)

Langue / Language

Anglais
Revue : Allemand

Editeur / Publisher

Hanser, München, ALLEMAGNE  (1948-2006) (Revue)

Mots-clés anglais / English Keywords

Tool steel

;

Rapid solidification

;

Hot isostatic pressing

;

Microstructure

;

Boron addition

;

Chemical composition

;

Hardness

;

SEM

;

XRD

;

Differential thermal analysis

;

Experimental study

;

Powder metallurgy

;

Mots-clés français / French Keywords

Acier outil

;

Solidification rapide

;

Pressage isostatique chaud

;

Microstructure

;

Addition bore

;

Composition chimique

;

Dureté

;

SEM

;

XRD

;

Analyse thermique différentielle

;

Etude expérimentale

;

Métallurgie poudre

;

Acier V6Cr5W5B1C1

;

Acier Cr12C2B1Mo1V1

;

Mots-clés espagnols / Spanish Keywords

Acero herramienta

;

Solidificación rápido

;

Prensado isostático caliente

;

Microestructura

;

Adición boro

;

Composición química

;

Dureza

;

Estudio experimental

;

Metalurgia polvo

;

Localisation / Location

INIST-CNRS, Cote INIST : 271, 35400005894036.0060

Nº notice refdoc (ud4) : 2902691



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