DEVELOPMENT OF HARDNESS IN A Fe- BASED NANO-COMPOSITE ALLOY
Publish Year: 1393
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJMSEI-11-4_005
تاریخ نمایه سازی: 26 مرداد 1402
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 ۳۶ Cr۱۲ Mo۱۰ , Fe ۳ C and Fe۳ B. More, Vickers hardness testing revealed a maximum hardness of ۱۸.۶ 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.
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Authors
S Ahmadi
Materials and Biomaterials Research Center, Biomaterials Group, Tehran, Iran.
H. R. Shahverdi
Tarbiat Modares University, Faculty of Engineering, Department of Materials Engineering, Tehran, Iran.