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通过定制渗碳体实现孪晶诱导塑性钢的强度-延展性平衡。

Achieving Strength-Ductility Balance in TWIP Steel by Tailoring Cementite.

作者信息

Zhao Zhenyu, Sheng Jian, Li Dazhao, Bai Shaobin, Chen Yongan, Lu Haitao, Cao Pengfei, Liu Xin

机构信息

School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.

Shanxi Key Laboratory of Advanced Metal Materials for Special Environments, Taiyuan 030051, China.

出版信息

Materials (Basel). 2025 Feb 14;18(4):843. doi: 10.3390/ma18040843.

DOI:10.3390/ma18040843
PMID:40004366
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11857091/
Abstract

High-Mn steels are widely used in various fields. However, the FCC structure is not conducive to improving strength, limiting their development and application. In this work, hot-rolled Fe-25Mn-1Al-3Si-1C (wt.%) steel was annealed at various temperatures to tailor the cementite particles and recrystallized grains, thus achieving a balance between strength and ductility. As the annealing temperature increased from 550 to 650 °C, the volume fraction of recrystallized grains slightly increased and the volume fraction of cementite particles initially increased and then decreased, which was explained and verified by the quantitative calculation. Especially, the high-density pre-dislocation and finely dispersed cementite particles in sample AN550 resulted in a relatively low volume fraction of recrystallized grains. Interestingly, secondary deformation twinning was activated during the subsequent tensile deformation in addition to the dislocations, stacking faults, and previous deformation twinning. This complex interaction among various deformation mechanisms indued a good balance between strength and ductility, achieving an outstanding result (58.9 GPa%) regarding tensile strength and total elongation. This work offers an effective route for developing a high-Mn TWIP steel with outstanding strength-ductility balance.

摘要

高锰钢在各个领域有着广泛应用。然而，面心立方（FCC）结构不利于强度提升，限制了它们的发展与应用。在本研究中，对热轧态的Fe-25Mn-1Al-3Si-1C（重量百分比）钢在不同温度下进行退火处理，以调整渗碳体颗粒和再结晶晶粒，从而在强度和延展性之间实现平衡。随着退火温度从550℃升高到650℃，再结晶晶粒的体积分数略有增加，渗碳体颗粒的体积分数先增加后减小，这通过定量计算得到了解释和验证。特别是，样品AN550中高密度的预存位错和精细弥散的渗碳体颗粒导致再结晶晶粒的体积分数相对较低。有趣的是，在随后的拉伸变形过程中，除了位错、层错和先前的变形孪晶外，二次变形孪晶也被激活。各种变形机制之间的这种复杂相互作用在强度和延展性之间实现了良好平衡，在抗拉强度和总伸长率方面取得了优异的结果（58.9 GPa%）。这项工作为开发具有优异强度-延展性平衡的高锰孪生诱导塑性（TWIP）钢提供了一条有效途径。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d906/11857091/87ba5967c9b3/materials-18-00843-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d906/11857091/b92016a5e3e4/materials-18-00843-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d906/11857091/114cc6dce2c3/materials-18-00843-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d906/11857091/b80433e59351/materials-18-00843-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d906/11857091/265282cc011e/materials-18-00843-g010.jpg
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本文引用的文献

1
Novel 1.5 GPa-strength with 50%-ductility by transformation-induced plasticity of non-recrystallized austenite in duplex steels.通过双相钢中非再结晶奥氏体的相变诱发塑性获得具有50%延伸率的新型1.5吉帕强度。
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Observation of giant diffusivity along dislocation cores.沿位错核心的巨扩散率观测。
Science. 2008 Mar 21;319(5870):1646-9. doi: 10.1126/science.1151771.