Probing the effect of intragranular premature κ-carbide on incipient plasticity behavior in austenite-based Fe-Mn-Al-(Cr)-C steels
Probing the effect of intragranular premature κ-carbide on incipient plasticity behavior in austenite-based Fe-Mn-Al-(Cr)-C steels
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DOI：
10.1080/21663831.2022.2027034
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发表时间：
2022-01
影响因子：
8.3
通讯作者：
Jian-lei Zhang;Yuxiang Liu;Cong-hui Hu;A. Addad;A. Montagne;G. Ji;C. Song;Q. Zhai
中科院分区：
文献类型：
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作者：
Jian-lei Zhang;Yuxiang Liu;Cong-hui Hu;A. Addad;A. Montagne;G. Ji;C. Song;Q. Zhai
采用纳米压痕法研究了Fe-Mn-Al-(Cr)- c低密度钢中结构有序但不存在化学分配的纳米级过早碳化物对奥氏体塑性行为的影响。我们发现，早期塑性是由原子-空位交换的非均相位错成核机制主导的。虽然随着Cr的加入，κ-碳化物的含量降低，但其对初期塑性强度的影响可以忽略不计，因为位错成核的剪切应力略有增加。相比之下，随着Cr含量的增加，奥氏体中间隙C原子的增加通过增加必要的剪切应力来增强晶格内聚，从而阻碍了成核事件的发生。图摘要影响声明尽管纳米尺度的过早κ碳化物沉淀是最重要的强化相之一，但令人惊讶的是，它对Fe-Mn-Al-(Cr)- c低密度钢中奥氏体的早期塑性的影响可以忽略不计。
The effect of nanoscale intragranular premature κ-carbide precipitates, having an ordered structure but without chemical partitioning, on the incipient plasticity behavior of austenite in Fe-Mn-Al-(Cr)-C low-density steels was investigated by nanoindentation. We found that the incipient plasticity was dominated by a heterogeneous dislocation nucleation mechanism via atom-vacancy exchange. Although the content of κ-carbide decreased with Cr addition, its negligible effect on incipient plasticity strength was witnessed by the slightly increased shear stress for dislocation nucleation. Comparatively, the increased interstitial C atoms with Cr content in austenite enhanced lattice cohesions which impeded the nucleation events by increasing the requisite shear stress. GRAPHICAL ABSTRACT IMPACT STATEMENT Despite being one of the most important strengthening phases, nanoscale premature κ-carbide precipitates surprisingly have a negligible effect on incipient plasticity of austenite in Fe-Mn-Al-(Cr)-C low-density steels.