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Titre du document / Document title

Comportement et durée de vie en fatigue isotherme de l'acier X 38 CrMoV 5 = Isothermal fatigue beha viour and lifetime of a 5 % Cr hot work tool steel

Auteur(s) / Author(s)

DELAGNES D. (1) ; REZAÏ-ARIA F. (1) ; LEVAILLANT C. (1) ; GRELLIER A. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Ecole des Mines d'Albi Carmaux, Campus Jarlard, Albi, FRANCE
(2) Aubert & Duval, Aciérie des Ancizes, Les Ancizes, FRANCE

Résumé / Abstract

Dies and molds are subjected to severe mechanical and thermal loads during injection or forging operations, As fatigue is one of the most important cause of tool steels damage, we studied isothermal (between 200°C and 600°C) fatigue behaviour and damage of two grades (SMV3 and ADC3) of a tempered martensitic 5 % Cr steel. More than 100 fatigue tests were performed in order to analyse mechanical loading, temperature and initial hardness influences. We observed a softening during all lifetime which is typical of tempered martensitic steels Softening amplitudes are increasing with increasing total strain amplitude, and decreasing with increasing temperature (till 550°C) and hardness (between 42 HRC and 50 HRC). Influences of temperature and hardness are limited when observed through a Manson-Coffin diagram, Conversely, increasing test temperature or decreasing hardness leads to a strong reduction of lifetime (factor 1000 for a 8 HRC decrease!) when results are plotted in a Basquin diagram. Interrupted tests showed that crack initiation controls lifetime for a number of cycles to failure around 105 cycles. Three sites of crack initiation were identified and discussed. - non metallic inclusions (200°C-400°C); - lath boundary (200°C-400°C), - prior austenitic grain boundary (500°C-600°C).

Revue / Journal Title

Matériaux et techniques    ISSN  0032-6895   CODEN MATCBW 

Source / Source

Congrès
Cercle d'Etudes des Métaux. Colloque, Albi , FRANCE (27/05/1998)
1999, vol. 87, no 1-2 (50 p.)  (27 ref.), pp. 39-50

Langue / Language

Français

Editeur / Publisher

EDP Sciences, Les Ulis, FRANCE  (1970) (Revue)

Mots-clés anglais / English Keywords

Fatigue

;

Isothermal condition

;

Hot forming

;

Fatigue life

;

Tool steel

;

Hardness

;

Crack initiation

;

Fatigue crack

;

Damaging

;

Cyclic load

;

Mechanical properties

;

Forming tool

;

Mots-clés français / French Keywords

Fatigue

;

Condition isotherme

;

Formage à chaud

;

Durée vie fatigue

;

Acier outil

;

Dureté

;

Amorçage fissure

;

Fissure fatigue

;

Endommagement

;

Charge cyclique

;

Propriété mécanique

;

Outillage formage

;

Acier Cr5Mo1V

;

Mots-clés espagnols / Spanish Keywords

Fatiga

;

Condición isoterma

;

Termoconformado

;

Longevidad fatiga

;

Acero herramienta

;

Dureza

;

Iniciación grieta

;

Fisura fatiga

;

Deterioración

;

Carga cíclica

;

Propiedad mecánica

;

Herramientas confección

;

Localisation / Location

INIST-CNRS, Cote INIST : 735, 35400007480040.0060

Nº notice refdoc (ud4) : 1741621



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