Abstract
The spinodal composition zone in Al added Fe-Mn-Al-C twinning-induced plasticity (TWIP) steels can be determined by contents of Al and C and aging temperature together, based on the thermodynamic analysis. Precipitation of ordered (FeMn)3AlC carbide by the mechanism of spinodal decomposition occurs in the C-rich and Al-rich zone with low aging temperature. Increase of aging temperature shrinks spinodal composition zone to the high Al and C contents. As a result, the precipitation of (FeMn)3AlC carbide alters from spinodal decomposition to classical nucleation-growth manner gradually. Further calculation indicates that the diffusion of Al can play a key role in determining the growth rate of (FeMn)3AlC carbide at high aging temperature.
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Foundation item: the National Natural Science Foundation of China (No. 51371117)
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Yang, L., Huang, F., Guo, Z. et al. Investigation on the formation mechanism of ordered carbide (FeMn)3AlC in the Al added twinning-induced plasticity steels. J. Shanghai Jiaotong Univ. (Sci.) 21, 406–410 (2016). https://doi.org/10.1007/s12204-016-1739-7
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DOI: https://doi.org/10.1007/s12204-016-1739-7
Keywords
- twinning-induced plasticity (TWIP) steel
- (FeMn)3AlC carbide
- spinodal decomposition
- thermodynamics
- diffusion