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http://dx.doi.org/10.12656/jksht.2020.33.2.65

Effects of Tempering Temperature and Time on Microstructure and Mechanical Property of Cu-Sn Alloy  

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)
Publication Information
Journal of the Korean Society for Heat Treatment / v.33, no.2, 2020 , pp. 65-71 More about this Journal
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.
Keywords
Cu-Sn alloy; Quenching; Tempering; Martensite; Hardness;
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