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低碳低合金钢时效过程中Mn在α-Fe与渗碳体间重分布特征

张植权 周邦新 王均安 刘文庆

张植权, 周邦新, 王均安, 刘文庆. 低碳低合金钢时效过程中Mn在α-Fe与渗碳体间重分布特征[J]. 工程科学学报, 2020, 42(3): 340-347. doi: 10.13374/j.issn2095-9389.2019.04.24.005
引用本文: 张植权, 周邦新, 王均安, 刘文庆. 低碳低合金钢时效过程中Mn在α-Fe与渗碳体间重分布特征[J]. 工程科学学报, 2020, 42(3): 340-347. doi: 10.13374/j.issn2095-9389.2019.04.24.005
ZHANG Zhi-quan, ZHOU Bang-xin, WANG Jun-an, LIU Wen-qing. Redistribution of Mn between α-Fe matrix and θ cementite during long-term thermal aging in a low alloy steel[J]. Chinese Journal of Engineering, 2020, 42(3): 340-347. doi: 10.13374/j.issn2095-9389.2019.04.24.005
Citation: ZHANG Zhi-quan, ZHOU Bang-xin, WANG Jun-an, LIU Wen-qing. Redistribution of Mn between α-Fe matrix and θ cementite during long-term thermal aging in a low alloy steel[J]. Chinese Journal of Engineering, 2020, 42(3): 340-347. doi: 10.13374/j.issn2095-9389.2019.04.24.005

低碳低合金钢时效过程中Mn在α-Fe与渗碳体间重分布特征

doi: 10.13374/j.issn2095-9389.2019.04.24.005
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2011CB610503);国家自然科学基金重点资助项目(50931003);上海市重点学科建设资助项目(S30107)
详细信息
    通讯作者:

    E-mail:zhoubx@shu.edu.cn

  • 中图分类号: TG142.71

Redistribution of Mn between α-Fe matrix and θ cementite during long-term thermal aging in a low alloy steel

More Information
  • 摘要: 利用原子探针层析技术研究了核反应堆压力容器(RPV)模拟钢调质处理后在370和400 ℃长期时效以及淬火后在400 ℃长期时效后Mn在α-Fe基体与渗碳体间重分布的特征。研究结果表明,在所有热处理条件下,Mn均会从α-Fe基体向渗碳体内扩散,引起渗碳体内Mn浓度升高。其中淬火后直接在400 ℃时效条件下试样中渗碳体内的Mn浓度最高。即使在400 ℃经过35000 h长时间时效,Mn在渗碳体内的浓度仍未达到平衡,需要进一步延长时效时间,这与Mn在400 ℃在α-Fe基体中扩散速率极其缓慢有关。此外,Mn在渗碳体内的分布也不均匀,在靠近α-Fe基体/渗碳体界面附近的渗碳体一侧存在Mn的原子偏聚区,偏聚区Mn浓度随时效温度升高而增加。长时间时效后,Mn在两相间重分布特征与Mn在渗碳体内扩散速率低于Mn在α-Fe基体中扩散速率有关。
  • 图  1  调质处理的试样在370 ℃时效28800 h后C和Mn原子的分布图(a),沿垂直于α/θ界面方向各合金元素成分的分布图:Fe、C、Mn(b),Mo、Si、Ni、Cu(c),P(d)

    Figure  1.  Atom maps of C and Mn in a quenched-tempered sample after thermal aging at 370 ℃ for 28800 h (a), composition profiles of Fe, C, and Mn (b), Mo, Si, Ni, and Cu (c), and P (d) across the α/θ interface

    图  2  调质处理的试样在400 ℃时效35000 h后C和Mn原子的分布图(a)和Fe、C、Mn沿垂直于α/θ界面方向成分的分布图(b)

    Figure  2.  Atom maps of C and Mn in a quenched-tempered RPV steel sample after thermal aging at 400 ℃ for 35000 h (a) and composition profiles of Fe, C, and Mn across the α/θ interface (b)

    图  3  淬火试样在400 ℃时效35000 h后C和Mn原子分布图(a)和Fe、C、Mn沿垂直于α/θ界面方向成分分布图(b)

    Figure  3.  Atom maps of C and Mn in a quenched sample after thermal aging at 400 ℃ for 35000 h (a) and composition profiles of Fe, C, and Mn across the α/θ interface (b)

    表  1  A508-Ⅲ钢的化学成分

    Table  1.   Nominal chemical composition of A508-III steel with high Cu content

    Content/%CuNiMnSiPCSMoFe
    Atomic fraction 0.53 0.81 1.60 0.77 0.03 1.00 0.011 0.31 Bal.
    Mass fraction 0.60 0.85 1.58 0.39 0.016 0.22 0.006 0.54 Bal.
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  • 收稿日期:  2019-04-24
  • 刊出日期:  2020-03-01

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