A new nanoscale metastable iron phase in carbon steels

Tianwei Liu, Danxia Zhang, Qing Liu, Yanjun Zheng, Yanjing Su, Xinqing Zhao, Jiang Yin, Minghui Song, Dehai Ping
2015 Scientific Reports  
Metastable ω phase is common in body-centred cubic (bcc) metals and alloys, including high-alloying steels. Recent theoretical calculations also suggest that the ω structure may act as an intermediate phase for face-centred cubic (fcc)-to-bcc transformation. Thus far, the role of the ω phase played in fcc-bcc martensitic transformation in carbon steels has not been reported. In previous investigations on martensitic carbon steels, extra electron diffraction spots were frequently observed by
more » ... smission electron microscopy (TEM), and these spots were historically ascribed to the diffraction arising from either internal twins or carbides. In this paper, an intensive TEM investigation revealed that the extra spots are in fact attributed to the metastable ω phase in particle-like morphology with an overall size of several or dozens of nanometres. The strict orientation relationships between the ω phase and the ferrite matrix are in good agreement with those of the hexagonal (P6/mmm) ω phase in other bcc metals and alloys. The identification of the ω phase as well as the extra diffraction spots might provide a clue to help understand the physical mechanism of martensitic transformation in steels.
doi:10.1038/srep15331 pmid:26503890 pmcid:PMC4621516 fatcat:wa36ezmnrbcedp467stiso3eia