Isothermal compression tests were carried out to investigate the hot deformation behavior of a multi-alloyed high-Mn austenitic steel, 110Mn12Cr2NY, at temperatures ranging from 800 to 1200 °C and strain rates ranging from 0.01 to 1 s−1. The results revealed that the critical strain for dynamic recrystallization (DRX) lowered with increasing deformation temperature and decreasing strain rate. The analysis of microstructure pointed to discontinuous dynamic recrystallization (DDRX) as the dominant DRX mechanism, characterized by Σ3 twin boundaries and necklace-like structure during deformation at relatively low temperature and high strain rate. The decrease in strain rate facilitated continuous dynamic recrystallization (CDRX) as an auxiliary nucleation mechanism, leading to a significant decrease in the softening rate in the flow stress curves. When deformed at high temperatures and low strain rates, the preferential growth of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42243_2025_1473_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">$\left\langle {001} \right\rangle$</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mn>001</mn> </mfenced> </math></EquationSource> </InlineEquation> oriented grains resulted in the formation of a strong <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42243_2025_1473_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">$\left\langle {001} \right\rangle$</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mn>001</mn> </mfenced> </math></EquationSource> </InlineEquation>//CD texture, and CDRX associated with <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42243_2025_1473_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">$\left\langle {001} \right\rangle$</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="〉" open="〈"> <mn>001</mn> </mfenced> </math></EquationSource> </InlineEquation> grains emerged as the predominant DRX mechanism. Significant DRX occurring at high temperatures and high strain rates yielded fine, defect-free equiaxed grains. Consequently, this region could be employed as the optimal hot working window for 110Mn12Cr2NY steel, with a temperature range of 950–1200 °C and a strain rate range of 0.4–1 s−1.

Flow softening behavior associated with dynamic recrystallization and preferential growth of a multielement strengthening high-Mn austenitic steel

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发表日期：

2025年4月7日

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Xiang-yang Qi,
Chen Chen,
Yan-guo Li,
Zhi-nan Yang,
Shu-chao Shen,
Bo Lv,
Fu-cheng Zhang

摘要

Isothermal compression tests were carried out to investigate the hot deformation behavior of a multi-alloyed high-Mn austenitic steel, 110Mn12Cr2NY, at temperatures ranging from 800 to 1200 °C and strain rates ranging from 0.01 to 1 s⁻¹. The results revealed that the critical strain for dynamic recrystallization (DRX) lowered with increasing deformation temperature and decreasing strain rate. The analysis of microstructure pointed to discontinuous dynamic recrystallization (DDRX) as the dominant DRX mechanism, characterized by Σ3 twin boundaries and necklace-like structure during deformation at relatively low temperature and high strain rate. The decrease in strain rate facilitated continuous dynamic recrystallization (CDRX) as an auxiliary nucleation mechanism, leading to a significant decrease in the softening rate in the flow stress curves. When deformed at high temperatures and low strain rates, the preferential growth of $\left\langle {001} \right\rangle$ $〈001〉$ oriented grains resulted in the formation of a strong $\left\langle {001} \right\rangle$ $〈001〉$ //CD texture, and CDRX associated with $\left\langle {001} \right\rangle$ $〈001〉$ grains emerged as the predominant DRX mechanism. Significant DRX occurring at high temperatures and high strain rates yielded fine, defect-free equiaxed grains. Consequently, this region could be employed as the optimal hot working window for 110Mn12Cr2NY steel, with a temperature range of 950–1200 °C and a strain rate range of 0.4–1 s⁻¹.