Titre du document / Document title

Casting structure and mechanical properties of lead-free bronze castings containing bismuth as alloying element

Auteur(s) / Author(s)

NISHIO Toshiyuki ⁽¹⁾ ; KOBAYASHI Keizo ⁽¹⁾ ; MATSUMOTO Akihiro ⁽¹⁾ ; OZAKI Kimihiro ⁽¹⁾ ;

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

⁽¹⁾ National Institute of Advanced Industrial Science and Technology, JAPON

Résumé / Abstract

Bismuth-bearing bronze alloy is drawing attention as a lead-free copper alloy substitute for CAC406 alloy. Effects of the bismuth content and cooling rate on the casting structure and mechanical properties of bronze alloys were investigated. The decrease in the liquidus line reduced with increasing bismuth content, resulting in a large change in the alloying components such as zinc and bismuth. The bismuth content of 3 mass% is appropriate for controlling composition and obtaining a good castability under the same casting conditions as CAC406 alloy. Small pores are formed in the bismuth-bearing bronze alloy. The amount of pores was found to increase with increasing bismuth content. In addition, higher cooling rates of the alloy during casting diminished the amount of pores and increased bulk density. Uniform dispersion of fine bismuth particles (about 10 μm) and grain refinement led to higher strength and higher elongation of the alloy. A 3 mass% bismuth-bearing bronze alloy of 2 mm in thickness showed more than 50% elongation and 300 MPa tensile strength.

Revue / Journal Title

Chuzo kogaku   ISSN 1342-0429 

Source / Source

2005, vol. 77, n^o7, pp. 453-458 [6 page(s) (article)] (10 ref.)

Langue / Language

Anglais
Revue : Japonais

Editeur / Publisher

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

Mots-clés anglais / English Keywords

Foundry ; Microstructure ; Alloying element ; Leaded bronze ; Mechanical properties ;

Mots-clés français / French Keywords

Fonderie ; Microstructure ; Elément alliage ; Bronze au plomb ; Propriété mécanique ;

Mots-clés espagnols / Spanish Keywords

Fundería ; Microestructura ; Elemento aleación ; Bronce plomoso ; Propiedad mecánica ;

Mots-clés d'auteur / Author Keywords

lead-free bronze ; bismuth-bearing bronze ; microstructure ; mechanical properties ;

Localisation / Location

INIST-CNRS, Cote INIST : 7314, 35400013236477.0030