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Titre du document / Document title

Rolling contact fatigue strength of successive austempered ductile cast iron

Auteur(s) / Author(s)

FUJITA T. ; OGI K. ; SAWAMOTO A. ;

Résumé / Abstract

Successive austempering process, in which upper bainite transformation was immediately followed by lower bainite transformation, remarkably improved the machinability of ADI without impairing the tensile properties. In this paper, the rolling contact fatigue strength (F*) of successive austempered ductile iron (SADI) was investigated by using a Nishihara-type wear test machine with a gear oil lubricant. The ductile iron containing 3.52 % C. 2,07% Si 0.24%Mn and 0.04%Mg was austempered at 648K for 1.8 ks and then austempered at 588 K for 0.9 to 18 ks, The amount of γ-pool decreased from 6.52 % to 0.19 % with increasing the holding time at 588 K. The F* value decreased with the progress of lower bainite transformation until 9ks, however that of the iron held for 18ks exhibited a higher F*. Although this F* value is still 30 MPa smaller than that of ordinary ADI austempered at 648 K for 7.2 ks, the machinability of the SADI was considerably higher. This indicates that, the SADI can be provided with a good combination of superior machinability and higher rolling contact fatigue strength.

Revue / Journal Title

Chuzo kogaku    ISSN  1342-0429 

Source / Source

1998, vol. 70, no4, pp. 260-265 (5 ref.)

Langue / Language

Japonais

Editeur / Publisher

Nihon Chuzo Kogakukai, Tokyo, JAPON  (1996) (Revue)

Mots-clés anglais / English Keywords

Mechanical properties

;

Machinability

;

Roll contact fatigue

;

Austempering

;

Bainitic transformations

;

Microstructure

;

Fatigue strength

;

Ductile cast iron

;

Hardness

;

Mots-clés français / French Keywords

Propriété mécanique

;

Usinabilité

;

Fatigue contact roulement

;

Trempe étagée bainitique

;

Transformation bainitique

;

Microstructure

;

Résistance fatigue

;

Fonte graphite sphéroïdal

;

Dureté

;

Mots-clés espagnols / Spanish Keywords

Fatiga contacto rodillo

;

Temple escalonado bainítico

;

Resistencia fatiga

;

Fundición grafítica esferoidal

;

Localisation / Location

INIST-CNRS, Cote INIST : 7314, 35400007677546.0040

Nº notice refdoc (ud4) : 2327965



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