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Volume 25 Issue 4
Apr.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(4): 429-438
Babak Shahriari, Reza Vafaei, Ehsan Mohammad Sharifi,  and Khosro Farmanesh, Aging behavior of a copper-bearing high-strength low-carbon steel, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 429-438. https://doi.org/10.1007/s12613-018-1588-5
Cite this article as:
Babak Shahriari, Reza Vafaei, Ehsan Mohammad Sharifi,  and Khosro Farmanesh, Aging behavior of a copper-bearing high-strength low-carbon steel, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 429-438. https://doi.org/10.1007/s12613-018-1588-5
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研究论文

Aging behavior of a copper-bearing high-strength low-carbon steel

  • Department of Materials Engineering, Malek Ashtar University of Technology, P. O. Box 83145/115, Shahin Shahr, Isfahan, Iran

  • 通讯作者:

    Ehsan Mohammad Sharifi    E-mail: ehsan_sharifi_2000@yahoo.com

  • The effects of aging temperature and time on the hardness and impact toughness of a copper-bearing high-strength low-carbon steel were investigated. The hardness of the aged samples reached maxima after 1 h and 5 h of aging at 500 and 450℃, respectively; this increase in hardness was followed by a decrease in hardness until a temperature of 700℃, at which secondary hardening was observed. The impact toughness of the aged steel was found to be higher for 5 h of aging. Transmission electron microscopy confirmed the presence of carbide and copper precipitates; also, the secondary hardening could be the result of the transformation of austenite (formed in the aging treatment) to martensite. Differential scanning calorimetry of the steel was performed to better understand the precipitation behavior. The results revealed that the precipitation of the steel exhibited two significant stages of copper precipitate nucleation and coarsening of the precipitates, with corresponding activation energies of 49 and 238 kJ·mol-1, respectively.
    • Research Article

    Aging behavior of a copper-bearing high-strength low-carbon steel

    + Author Affiliations
      Abstract
    • The effects of aging temperature and time on the hardness and impact toughness of a copper-bearing high-strength low-carbon steel were investigated. The hardness of the aged samples reached maxima after 1 h and 5 h of aging at 500 and 450℃, respectively; this increase in hardness was followed by a decrease in hardness until a temperature of 700℃, at which secondary hardening was observed. The impact toughness of the aged steel was found to be higher for 5 h of aging. Transmission electron microscopy confirmed the presence of carbide and copper precipitates; also, the secondary hardening could be the result of the transformation of austenite (formed in the aging treatment) to martensite. Differential scanning calorimetry of the steel was performed to better understand the precipitation behavior. The results revealed that the precipitation of the steel exhibited two significant stages of copper precipitate nucleation and coarsening of the precipitates, with corresponding activation energies of 49 and 238 kJ·mol-1, respectively.
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