A PHASE-TRANSFORMATION-STRENGTHENED SURFACE LAYER ON Fe-20Mn-3Al-3Si STEEL FABRICATED BY MECHANICAL GRINDING

doi:10.3724/SP.J.1037.2013.00568

Acta Metall Sin

2014, Vol. 50

Issue (4): 423-430 DOI: 10.3724/SP.J.1037.2013.00568

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A PHASE-TRANSFORMATION-STRENGTHENED SURFACE LAYER ON Fe-20Mn-3Al-3Si STEEL FABRICATED BY MECHANICAL GRINDING

CHEN Yan¹, WU Cuilan^1,²(

), XIE Pan¹, CHEN Wanglin¹, XIAO Hui¹, CHEN Jianghua^1,²

1 Center of High Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha 410082
2 Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082

Cite this article:

CHEN Yan, WU Cuilan, XIE Pan, CHEN Wanglin, XIAO Hui, CHEN Jianghua. A PHASE-TRANSFORMATION-STRENGTHENED SURFACE LAYER ON Fe-20Mn-3Al-3Si STEEL FABRICATED BY MECHANICAL GRINDING. Acta Metall Sin, 2014, 50(4): 423-430.

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Abstract

In the last decade, transformation induced plasticity (TRIP) aided steels and twinning induced plasticity (TWIP) aided steels have attracted a great deal of attention due to their high strength and exceptional ductility at room temperature. In the present work, a TRIP/TWIP austenite steel with the composition as Fe-20Mn-3Al-3Si has been investigated by means of surface mechanical grinding treatment (SMGT) since it is an alloy with low stacking fault energy. The e-M and/or a-M transformations can easily occur in the steel when deformed at room temperature. It is shown that a gradient phase-transformation-strengthened (PTS) surface layer can be formed on bulk Fe-20Mn-3Al-3Si steel by SMGT at room temperature, due to the martensitic transformation of γ→ε→α on its surface. The formation of martensitic phases is dependent on the strain applied and the orientation of grains. The more the {111} or the {110} planes of grains are parallel to the specimen surface plane, the easier the martensitic laths are to be formed in the gains. The total thickness of the PTS surface layer, which formed in the process of turning at room temperature, can be more than 400 μm, but its microstructure and hardness change with depth. The top PTS layer consists of nanometer sized grains while the sublayer contains a great many of martensite laths mixed with deformation twins. With increasing of the depth, the numbers of laths decrease. Correspondingly, the micro-hardness continuously decreases with the depth from 450 HV to about 220 HV (the hardness of the matrix). The formed PTS layer has a good thermodynamic stability, so that its microstructure and hardness almost do not change after annealed at 400 ℃ for 1 h.

Key words: phase-transformation strengthening surface mechanical grinding treatment high manganese steel strain induced phase transformation surface strengthening

Received: 09 September 2013

ZTFLH:

TG142.33

Fund: Supported by National Basic Research Program of China (No.2009CB623704), National Natural Science Foundation of China (Nos.51071064, 51171063 and 51371081) and Instrumental Innovation Foundation of Hunan Province (No.2011TT1003)

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	Yan CHEN
	Cuilan WU
	Pan XIE
	Wanglin CHEN
	Hui XIAO
	Jianghua CHEN

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00568 OR https://www.ams.org.cn/EN/Y2014/V50/I4/423

Fig.1

Fe-20Mn-3Al-3Si钢平板样品经不同方式抛光后的SEM像

Fig.2

Fe-20Mn-3Al-3Si钢机械抛光平板样品的显微硬度压痕

Fig.3

不同扫描模式下Fe-20Mn-3Al-3Si钢平板样品经不同方式抛光后的XRD谱

表1 机械抛光平板样品不同深度表面层中各相含量

Fig.4

Fe-20Mn-3Al-3Si钢平板样品的显微组织及EBSD取向分析

Fig.5

Fe-20Mn-3Al-3Si车削样品横截面显微组织和EBSD分析

Fig.6

车削样品深度方向的硬度分布

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