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首页> 外文期刊>Materials Science and Engineering >Reverse partitioning of Al from κ-carbide to the γ-matrix upon Ni addition and its strengthening effect in Fe-Mn-Al-C lightweight steel
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Reverse partitioning of Al from κ-carbide to the γ-matrix upon Ni addition and its strengthening effect in Fe-Mn-Al-C lightweight steel

机译：在Fe-Mn-Al-C轻质钢中，在Ni加法和强化效果时从κ-碳化到γ矩阵的反向分隔

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摘要

The effect of the addition of Ni to Fe-30Mn-10Al-0.9C-0.5Si-l.5Mo (wt.%) cast lightweight steel was investigated with a focus on the precipitation behavior of (Fe,Mn)_3AlC κ-carbide. The addition of 3 wt.% Ni (3Ni steel) resulted in continuous hardening of the steel during aging heat treatment at 550 °C for 100 h whereas the addition of 1.5 wt.% Ni (1.5Ni steel) led to peak hardening at 550 °C for 20 h. The size of κ-carbides after aging heat treatment for 100 h was smaller in 3Ni steel compared with 1.5Ni steel, despite its higher hardness and progressed hardening. Atom probe tomography of the aged 3Ni steel revealed that Al atoms were preferentially enriched in the γ-matrix with clustering of Ni atoms observed, resulting in the relative depletion of Al in κ-carbide. This is the first report of reverse partitioning of Al from κ-carbide to the γ-matrix through Ni addition, indicating that the affinity of C-Al is lower than that of Ni-Al. The substitution of Mn to the Al site of the κ-carbide lattice is energetically favorable when Ni-Al bonding actively occurs in the γ-matrix, as determined by first-principles calculations. This is clearly evidenced by the Mn enrichment of κ-carbide in the 3Ni steel. The amount of Ni-Al clustering resulting from the reverse partitioning of Al to the γ-matrix during the precipitation of κ-carbide could be increased according to the growth of κ-carbide. Therefore, we found that the addition of Ni led to simultaneous cooperative precipitation- and solid solution-strengthening after aging, contributing to continuous hardening by effectively suppressing the movement of dislocations.
机译：研究了Ni至Fe-30mN-10Al-0.9c-0.5si-1mO-0.9c-0.5si-1mO-0.9c-0.5si-l.5mO（wt.％）铸造轻质钢的效果。重点是（Fe，Mn）_3Alcκ-硬质合金的沉淀行为。加入3重量％的Ni（3Ni钢）导致钢的老化热处理在550℃下100小时的连续硬化，而添加1.5重量％。％Ni（1.5ni钢）导致550℃的峰硬化°C 20小时。尽管其硬度更高，但耐高采烈，但在3Ni钢的情况下，3Ni钢的κ碳化物尺寸为100小时后较小。 Atom 3Ni钢的原子探测层析术显示，Al原子优先于γ-基质中富集，观察到Ni原子的聚类，导致κ-碳化物中的Al相对耗尽。这是通过添加的Ni添加到γ-基质中的Al从κ-碳，表明C-Al的亲和力低于Ni-Al的亲和力。当Ni-Al键合在γ-基质中，γ-碳化物晶格的Al位点取代为κ-碳化物晶格的Al位点，如通过第一原理计算所确定的。 3NI钢中的κ-硬质合金清楚地证明了这一点。根据κ-碳化物沉淀期间，由Al对γ-基质的反向分配产生的Ni-Al聚类的量可以根据κ-碳化物的生长增加。因此，我们发现添加Ni导致老化后同时合作沉淀和固体溶液，通过有效地抑制脱位的运动来连续硬化。

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  • 来源
    《Materials Science and Engineering》 |2021年第13期|141563.1-141563.13|共13页
  • 作者

    Chiwon Kim; Hyun-Uk Hong; Jae Hoon Jang; Bong Ho Lee; Seong-Jun Park; Joonoh Moon; Chang-Hoon Lee;

  • 作者单位

    Department of Materials Convergence and System Engineering Changwon National University 20 Changwondaehak-ro Changwon Gyeongnam 51140 Republic of Korea;

    Department of Materials Convergence and System Engineering Changwon National University 20 Changwondaehak-ro Changwon Gyeongnam 51140 Republic of Korea;

    Ferrous Alloy Department Korea Institute of Materials Science 797 Changwondaero Changwon Gyeongnam 51508 Republic of Korea;

    Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and Technology 333 Technojungangdaero Dalseonggun Daegu 42988 Republic of Korea;

    Ferrous Alloy Department Korea Institute of Materials Science 797 Changwondaero Changwon Gyeongnam 51508 Republic of Korea;

    Ferrous Alloy Department Korea Institute of Materials Science 797 Changwondaero Changwon Gyeongnam 51508 Republic of Korea;

    Ferrous Alloy Department Korea Institute of Materials Science 797 Changwondaero Changwon Gyeongnam 51508 Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    FeMnAlC; Ni addition; κ-carbide; Reverse partitioning; Dislocations;

    机译：Femnalc;我加了;κ-硬质合金;反向分区;脱臼;

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