Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Characteristics of Tensile Strength and Corrosion Resistance of Lead- free Brass Containing 1 wt.% of Bi

1 wt.% Bi 함유 무연황동의 인장강도와 내식특성에 대한 연구

  • Joo, Y.S. (Dept. of Metallurgical Engineering, Pukyong National University) ;
  • Lee, S.B. (Essentech Co. Ltd.) ;
  • Kim, S.Y. (Dept. of Mechanical Engineering, Pukyong National University) ;
  • Joo, C.S. (Dept. of Chemical Engineering, Pukyong National University) ;
  • Jung, B.H. (Dept. of Metallurgical Engineering, Pukyong National University)
  • 주영석 (부경대학교 공과대학 금속공학과) ;
  • 이상봉 ((주)에쎈테크) ;
  • 김시영 (부경대학교 공과대학 기계시스템공학과) ;
  • 주창식 (부경대학교 공과대학 화학공학과) ;
  • 정병호 (부경대학교 공과대학 금속공학과)
  • Received : 2011.04.12
  • Accepted : 2011.05.17
  • Published : 2011.05.30
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Abstract

This study has been investigated for tensile properties with lead-free brass containing 1 wt.% of Bi. And also characteristic of corrosion resistance was analyzed by polarization test. An increase of tempering temperature was found to tend to decrease tensile strength, and percentage of elongation was shown to be the lowest value at $300^{\circ}C$. On the other hand, the elongation was increased with an increase of tempering temperature after $300^{\circ}C$. The change of mechanical properties was closely related with the content and shape of acicular Witmanst$\ddot{a}$tten ${\alpha}$ formed at the interface of ${\beta}$ phase as well as in ${\beta}$ phase. Tensile strength had a tendency to be decreased with an increase of test temperature. The elongation was shown to be the lowest value at around $300^{\circ}C$, while it began to increase as test temperature rose after $300^{\circ}C$. It might be speculated that the reason that elongation was decreased was found to form bismuth film at the interface of ${\alpha}/{\beta}$ phase leading to be easily brittle when loaded by tensile stress. The lead-free brass containing 1 wt.% of Bi had similar characteristic of corrosion resistance with a free-cutting brass with 3.4 wt. % of Pb in spite of higher fraction of ${\beta}$ phase.

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