| Accession number;05A0645826 |
| Title;Casting Structure and Mechanical Properties of Lead-free Bronze Castings Containing Bismuth as Alloying Element |
| Author;NISHIO TOSHIYUKI(National Inst. Advanced Industrial Sci. and Technol., JPN) KOBAYASHI KEIZO(National Inst. Advanced Industrial Sci. and Technol., JPN) MATSUMOTO AKIHIRO(National Inst. Advanced Industrial Sci. and Technol., JPN) OZAKI KIMIHIRO(National Inst. Advanced Industrial Sci. and Technol., JPN) |
Journal Title;Journal of Japan Foundry Engineering Society
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Journal Code:G0096A
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ISSN:1342-0429
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VOL.77;NO.7;PAGE.453-458(2005)
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| Figure&Table&Reference;FIG.9, TBL.1, REF.10 |
| Pub. Country;Japan |
| Language;Japanese |
| 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 .MU.m) 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. (author abst.) |
