Revealing the Intrinsic Nanohardness of Lath Martensite in Low Carbon Steel

Revealing the Intrinsic Nanohardness of Lath Martensite in Low Carbon Steel
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揭示低碳钢中板条马氏体的本征纳米硬度

DOI:
10.1007/s11661-014-2681-7
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发表时间:
2015-02
影响因子:
2.8
通讯作者:
Huang M. X.
Huang M. X.
中科院分区:
材料科学2区
文献类型:
--
作者:
He B. B.;Huang M. X.

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用纳米压痕结合扫描电子显微镜、背散射电子衍射和透射电子显微镜研究了低碳钢马氏体块的力学性能。小马氏体块和大马氏体块的平均纳米硬度分别为6.9和5.4 GPA。由此观察到了越小越强的尺寸效应。这种尺寸效应归因于马氏体块在淬火过程中不同的形成顺序。因此,本文的工作表明,淬火后的马氏体可以看作是一种复合材料,小而强的马氏体块镶嵌在大而软的马氏体块基质中,这是模拟马氏体钢拉伸应力-应变行为的重要信息。
The mechanical property of martensite blocks in low carbon steel is studied by nanoindentation combined with scanning electron microscopy, electron backscattered diffraction, and transmission electron microscopy. The average nanohardnesses of small and large martensite blocks are 6.9 and 5.4 GPa, respectively. A size effect that the smaller is stronger is thus observed. This size effect was ascribed to the different formation sequence of martensite blocks during quenching. Therefore, the present work suggests that the as-quenched martensite may be considered as a composite material with the small but strong martensite blocks embedded in the large but soft martensite block matrix, which is important information for modeling the tensile stress–strain behavior of martensitic steel.
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