Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effects of Tempering Temperature and Time on Microstructure and Mechanical Property of Cu-Sn Alloy

Cu-Sn합금의 미세조직과 기계적 특성에 미치는 템퍼링 온도 및 시간의 영향

  • Jeong, Museob (Dept. of Materials Science & Engineering, Chungnam National University) ;
  • Lee, Hohyung (Dept. of Materials Science & Engineering, Chungnam National University) ;
  • Han, Jun Hyun (Dept. of Materials Science & Engineering, Chungnam National University)
  • 정무섭 (충남대학교 신소재공학과) ;
  • 이호형 (충남대학교 신소재공학과) ;
  • 한준현 (충남대학교 신소재공학과)
  • Received : 2020.03.16
  • Accepted : 2020.03.24
  • Published : 2020.03.30
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Abstract

To study the effects of tempering on microstructure and mechanical property of Cu-22 wt.%Sn alloy, tempering was carried out for 30 sec, 1 min, 5 min, 30 min, 3 h, 5 h, and 10 h at 325, 370, 500, and 570℃, which are in the (α+ε), lower (α+δ), higher (α+δ), and (α+γ) region of Cu-Sn phase diagram, respectively. Overall, the hardness value increased and decreased over time at all tempering temperatures, and the time to reach the maximum hardness value beccame shorter as the tempering temperature increases. At the beginning of tempering at each temperature, a portion of the β' phase was decomposed into a fine (α+δ) phase or (α+γ) phase, so that the Cu-22Sn alloy had a high hardness value. However, as the tempering time increases, the hardness value of the alloy decreased due to the growth of the decomposed phases.

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References

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