DEVELOPMENT OF HARDNESS IN A Fe- BASED NANO-COMPOSITE ALLOY

Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

Achieving extreme hardness in the newly synthetic steel formed by converting from initial amorphous state to subse-quent crystalline structure –named as devitrification process- was studied in this research work. Results of TEM observa-tions and XRD tests showed that crystallized microstructure were made up four different nano-scale phases i.e., α-Fe, Fe 36 Cr12 Mo10, Fe 3 C and Fe3 B. More, Vickers hardness testing revealed a maximum hardness of 18.6 GPa which is signifi-cantly harder than existing hardmetals. Detailed kinetic and structural studies have been proof that two key factors were contributed to achieve this extreme hardness; supersaturation of transition metal alloying elements (especially Nb) and also reduction in the structure to the nano-size crystals.

Language:
English
Published:
Iranian Journal of Materials science and Engineering, Volume:11 Issue: 4, Dec 2014
Pages:
28 to 32
https://www.magiran.com/p1347122