Elevated Temperature Tensile Strength of thin sheet Phosphor bronzes

Abstract

Elevated temperature and room temperature tension properties of phosphor bronzes containing 4%, 5%, 6%, 7% and 8% Sn, with thickness of 0.3mm are investigated. Results are as follows;1) Serration appears at 473-573K on Load-Elongation diagrams for elevated temperature tension test. And the relation has nothing to do with Sn content. Serration does not appear in case of room temperature tension test.2) Tensile strength does not depend on Sn content above 623K for elevated temperature tension test. Tensile strength depends on Sn content above 723K for room temperature tension test.3) Reduction of area of Sn 4%, 5% reaches to the minimum at 373K and reaches to the maximum at 750K, and that Sn 7%, 8% reaches to the minimum at 623K and reaches to the maximum at 740K for elevated temperature tension test.Shortness temperature area does appear in case of elevated temperature tension test. Shortness temperature area does not appear in case of room temperature tension test.4) There is an inflection point at around 280MPa, HV180 on the curve of relation between elevated temperature tensile strength and Vickers hardness. This relation seems to be represented by two straight lines, and the relation has nothing to do with Sn content.