Scholarlink

<p>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&#xa0;GPa) and FCC (~ 9.9 ± 0.9&#xa0;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&#xa0;GPa and ~ 10 ± 1.3&#xa0;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 (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10853_2025_11464_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\({E}_{s}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>E</mi> <mi>s</mi> </msub> </math></EquationSource> </InlineEquation>) 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 <i>P–h</i> 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.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2025年9月9日

查看全文
  • Debarpan Ghosh,
  • Suman Kumar,
  • Bhagyaraj Jayabalan,
  • Subrata Mukherjee,
  • Sumantra Mandal

摘要

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 ( \({E}_{s}\) 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