Unravelling the effect of diverse microstructural features on nano-mechanical properties and multiple pop-in behaviours in a multiphase lightweight steel

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-09-09 DOI:10.1007/s10853-025-11464-7

Debarpan Ghosh, Suman Kumar, Bhagyaraj Jayabalan, Subrata Mukherjee, Sumantra Mandal

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Abstract

In the current investigation, nano-indentation tests have been performed in Ni-containing Fe–Al–Mn–C steel in homogenized (undeformed) and forged (deformed) conditions in order to comprehend the nanoscale mechanical properties and multiple pop-in behaviours. The nano-hardness is observed to be higher in both BCC (~ 10.3 ± 0.9 GPa) and FCC (~ 9.9 ± 0.9 GPa) phases of undeformed specimen in comparison with the deformed one, which predominantly indicates the influence of nano-sized precipitates on the nano-hardness. Conversely, the grain boundary (GB) and the interphase region in deformed specimen show a higher nano-hardness of ~ 13 ± 0.8 GPa and ~ 10 ± 1.3 GPa in BCC and FCC, respectively, than the undeformed specimen due to the presence of coarse precipitates along GB and interphase. Further, the elastic modulus (\({E}_{s}\)) of the individual phases is calculated for both the specimens, and its dependency on the microstructural features is explored. In addition, the differences in multiple pop-in behaviours (i.e. the variation in pop-in length) in the P–h curve is explored and correlated with various underlying mechanisms. The multiple pop-in behaviour is observed to be associated with the factors such as the precipitate–dislocation interactions, the presence of pre-existing dislocations and the strain field generated due to dislocations.

Graphical abstract

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揭示多相轻钢中不同微观结构特征对纳米力学性能和多次弹出行为的影响

在目前的研究中，为了了解纳米尺度的力学性能和多次弹出行为，在均匀（未变形）和锻造（变形）条件下对含ni的Fe-Al-Mn-C钢进行了纳米压痕试验。未变形试样的BCC相（10.3±0.9 GPa）和FCC相（9.9±0.9 GPa）的纳米硬度均高于变形试样，这主要表明纳米析出物对纳米硬度的影响。相反，变形试样的晶界（GB）和界面区由于沿晶界和界面区存在粗相析出，BCC和FCC的纳米硬度分别高于未变形试样，分别为13±0.8 GPa和10±1.3 GPa。此外，计算了两个试样的各个相的弹性模量（\({E}_{s}\)），并探讨了其与微观结构特征的依赖关系。此外，还探讨了P-h曲线中多个弹出行为的差异（即弹出长度的变化），并将其与各种潜在机制相关联。观察到多次弹出行为与诸如沉淀-位错相互作用，先前存在的位错以及由于位错产生的应变场等因素有关。图形摘要

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.