Effect of PbS on Microstructure of High Lead Tin-Bronze Alloy by Centrifugal Casting

doi:10.12068/j.issn.1005-3026.2015.04.013

Abstract

Abstract: High lead tin-bronze alloy was produced by centrifugal casting method. The effects of PbS on microstructure and hardness of high lead tin-bronze alloy were studied. The results showed that in the alloy without PbS addition， the segregation of lead is serious， and the morphology is blocky or stripped. In the alloy with PbS addition， the compounds Cu₂S are formed and distributed uniformly on grain boundaries， which are nucleation sites. The compounds Cu₂S increase incessantly and form reticular structure， which hinder the segregation of lead. With increasing the mass fraction of PbS， the segregation of lead is reduced， the grains are refined gradually and the hardness increases. The segregation of lead is the smallest， the distribution of lead is the most homogenous and the grains are refined when 3.0% PbS is added.

Key words: high lead tin-bronze, centrifugal casting, segregation, microstructure, grain

CLC Number:

TH142.3

LIU Yue， CHEN Chao， QI Zhan-jun， LYU Wen-ling. Effect of PbS on Microstructure of High Lead Tin-Bronze Alloy by Centrifugal Casting[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 512-516.

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