A microstructural investigation on deformation mechanisms of Fe-18Cr-12Mn-0.05C metastable austenitic steels containing different amounts of nitrogen

作者：Kermanpur A^*; Behjati P; Han J; Najafizadeh A; Lee Y K

来源：Materials and Design, 2015, 82: 273-280.

DOI：10.1016/j.matdes.2015.05.075

• Ni-free austenitic stainless steels
• Deformation mechanism
• Martensitic transformation
• Nitrogen

Deformation mechanisms of the Ni-free Fe-18Cr-12Mn-0.05C (wt%) austenitic steels containing 0, 0.25 and 0.44 N were investigated. Effects of N addition, strain and temperature on the formation of deformation-induced epsilon- and alpha'-martensite phases were determined using transmission electron microscopy and electron back-scattered diffraction techniques. Based on the microstructural evolutions, it is proposed that deformation mechanism of these steels includes the sequence of gamma -> epsilon-martensite -> alpha'-martensite, in which the formation and stability of the epsilon-martensite is significantly enhanced by the N content. Increased deformation temperature from 298 to 373 K reduces the formation of epsilon-martensite (more than 80%).

• 出版日期2015-10-5