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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 Yan 1), WU Cuilan 1, 2), XIE Pan 1), CHEN Wanglin 1), XIAO Hui 1), 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
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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)
Corresponding Authors:  WU Cuilan, professor, Tel: (0731)88664010, E-mail: cuilan-wu@163.com   
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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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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00568     OR     https://www.ams.org.cn/EN/Y2014/V50/I4/423

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